48c452fb9c
git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@154 7ec92016-0320-0410-acc4-a06ded1c099a
1248 lines
37 KiB
C++
1248 lines
37 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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// The Loki Library
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// Copyright (c) 2001 by Andrei Alexandrescu
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// This code accompanies the book:
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// Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design
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// Patterns Applied". Copyright (c) 2001. Addison-Wesley.
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// Permission to use, copy, modify, distribute and sell this software for any
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// purpose is hereby granted without fee, provided that the above copyright
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// notice appear in all copies and that both that copyright notice and this
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// permission notice appear in supporting documentation.
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// The author or Addison-Wesley Longman make no representations about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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////////////////////////////////////////////////////////////////////////////////
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#ifndef SMARTPTR_INC_
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#define SMARTPTR_INC_
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////////////////////////////////////////////////////////////////////////////////
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// IMPORTANT NOTE
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// Due to threading issues, the OwnershipPolicy has been changed as follows:
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// Release() returns a boolean saying if that was the last release
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// so the pointer can be deleted by the StoragePolicy
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// IsUnique() was removed
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////////////////////////////////////////////////////////////////////////////////
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#include "SmallObj.h"
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#include "TypeManip.h"
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#include "static_check.h"
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#include <functional>
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#include <stdexcept>
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#include <cassert>
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namespace Loki
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{
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////////////////////////////////////////////////////////////////////////////////
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// class template DefaultSPStorage
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// Implementation of the StoragePolicy used by SmartPtr
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////////////////////////////////////////////////////////////////////////////////
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template <class T>
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class DefaultSPStorage
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{
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public:
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typedef T* StoredType; // the type of the pointee_ object
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typedef T* PointerType; // type returned by operator->
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typedef T& ReferenceType; // type returned by operator*
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DefaultSPStorage() : pointee_(Default())
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{}
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// The storage policy doesn't initialize the stored pointer
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// which will be initialized by the OwnershipPolicy's Clone fn
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DefaultSPStorage(const DefaultSPStorage&)
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{}
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template <class U>
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DefaultSPStorage(const DefaultSPStorage<U>&)
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{}
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DefaultSPStorage(const StoredType& p) : pointee_(p) {}
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PointerType operator->() const { return pointee_; }
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ReferenceType operator*() const { return *pointee_; }
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void Swap(DefaultSPStorage& rhs)
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{ std::swap(pointee_, rhs.pointee_); }
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// Accessors
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friend inline PointerType GetImpl(const DefaultSPStorage& sp)
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{ return sp.pointee_; }
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friend inline const StoredType& GetImplRef(const DefaultSPStorage& sp)
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{ return sp.pointee_; }
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friend inline StoredType& GetImplRef(DefaultSPStorage& sp)
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{ return sp.pointee_; }
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protected:
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// Destroys the data stored
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// (Destruction might be taken over by the OwnershipPolicy)
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void Destroy()
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{ delete pointee_; }
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// Default value to initialize the pointer
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static StoredType Default()
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{ return 0; }
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private:
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// Data
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StoredType pointee_;
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template RefCounted
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// Implementation of the OwnershipPolicy used by SmartPtr
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// Provides a classic external reference counting implementation
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////////////////////////////////////////////////////////////////////////////////
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template <class P>
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class RefCounted
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{
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public:
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RefCounted()
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{
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pCount_ = static_cast<unsigned int*>(
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SmallObject<>::operator new(sizeof(unsigned int)));
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assert(pCount_);
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*pCount_ = 1;
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}
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RefCounted(const RefCounted& rhs)
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: pCount_(rhs.pCount_)
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{}
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// MWCW lacks template friends, hence the following kludge
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template <typename P1>
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RefCounted(const RefCounted<P1>& rhs)
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: pCount_(reinterpret_cast<const RefCounted&>(rhs).pCount_)
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{}
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P Clone(const P& val)
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{
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++*pCount_;
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return val;
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}
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bool Release(const P&)
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{
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if (!--*pCount_)
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{
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SmallObject<>::operator delete(pCount_, sizeof(unsigned int));
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return true;
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}
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return false;
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}
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void Swap(RefCounted& rhs)
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{ std::swap(pCount_, rhs.pCount_); }
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enum { destructiveCopy = false };
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private:
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// Data
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unsigned int* pCount_;
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template RefCountedMT
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// Implementation of the OwnershipPolicy used by SmartPtr
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// Implements external reference counting for multithreaded programs
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// Policy Usage: RefCountedMTAdj<ThreadingModel>::RefCountedMT
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////////////////////////////////////////////////////////////////////////////////
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template <template <class> class ThreadingModel>
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struct RefCountedMTAdj
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{
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template <class P>
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class RefCountedMT : public ThreadingModel< RefCountedMT<P> >
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{
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typedef ThreadingModel< RefCountedMT<P> > base_type;
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typedef typename base_type::IntType CountType;
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typedef volatile CountType *CountPtrType;
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public:
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RefCountedMT()
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{
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pCount_ = static_cast<CountPtrType>(
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SmallObject<ThreadingModel>::operator new(
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sizeof(*pCount_)));
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assert(pCount_);
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*pCount_ = 1;
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}
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RefCountedMT(const RefCountedMT& rhs)
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: pCount_(rhs.pCount_)
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{}
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//MWCW lacks template friends, hence the following kludge
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template <typename P1>
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RefCountedMT(const RefCountedMT<P1>& rhs)
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: pCount_(reinterpret_cast<const RefCountedMT<P>&>(rhs).pCount_)
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{}
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P Clone(const P& val)
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{
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ThreadingModel<RefCountedMT>::AtomicIncrement(*pCount_);
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return val;
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}
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bool Release(const P&)
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{
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if (!ThreadingModel<RefCountedMT>::AtomicDecrement(*pCount_))
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{
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SmallObject<ThreadingModel>::operator delete(
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const_cast<CountType *>(pCount_),
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sizeof(*pCount_));
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return true;
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}
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return false;
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}
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void Swap(RefCountedMT& rhs)
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{ std::swap(pCount_, rhs.pCount_); }
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enum { destructiveCopy = false };
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private:
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// Data
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CountPtrType pCount_;
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};
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template COMRefCounted
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// Implementation of the OwnershipPolicy used by SmartPtr
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// Adapts COM intrusive reference counting to OwnershipPolicy-specific syntax
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////////////////////////////////////////////////////////////////////////////////
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template <class P>
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class COMRefCounted
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{
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public:
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COMRefCounted()
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{}
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template <class U>
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COMRefCounted(const COMRefCounted<U>&)
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{}
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static P Clone(const P& val)
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{
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val->AddRef();
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return val;
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}
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static bool Release(const P& val)
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{ val->Release(); return false; }
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enum { destructiveCopy = false };
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static void Swap(COMRefCounted&)
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{}
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template DeepCopy
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// Implementation of the OwnershipPolicy used by SmartPtr
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// Implements deep copy semantics, assumes existence of a Clone() member
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// function of the pointee type
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////////////////////////////////////////////////////////////////////////////////
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template <class P>
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struct DeepCopy
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{
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DeepCopy()
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{}
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template <class P1>
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DeepCopy(const DeepCopy<P1>&)
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{}
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static P Clone(const P& val)
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{ return val->Clone(); }
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static bool Release(const P& val)
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{ return true; }
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static void Swap(DeepCopy&)
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{}
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enum { destructiveCopy = false };
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template RefLinked
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// Implementation of the OwnershipPolicy used by SmartPtr
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// Implements reference linking
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////////////////////////////////////////////////////////////////////////////////
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namespace Private
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{
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class RefLinkedBase
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{
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public:
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RefLinkedBase()
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{ prev_ = next_ = this; }
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RefLinkedBase(const RefLinkedBase& rhs)
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{
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prev_ = &rhs;
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next_ = rhs.next_;
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prev_->next_ = this;
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next_->prev_ = this;
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}
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bool Release()
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{
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if (next_ == this)
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{
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assert(prev_ == this);
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return true;
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}
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prev_->next_ = next_;
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next_->prev_ = prev_;
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return false;
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}
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void Swap(RefLinkedBase& rhs)
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{
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if (next_ == this)
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{
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assert(prev_ == this);
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if (rhs.next_ == &rhs)
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{
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assert(rhs.prev_ == &rhs);
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// both lists are empty, nothing 2 do
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return;
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}
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prev_ = rhs.prev_;
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next_ = rhs.next_;
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prev_->next_ = next_->prev_ = this;
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rhs.next_ = rhs.prev_ = &rhs;
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return;
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}
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if (rhs.next_ == &rhs)
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{
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rhs.Swap(*this);
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return;
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}
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std::swap(prev_, rhs.prev_);
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std::swap(next_, rhs.next_);
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std::swap(prev_->next_, rhs.prev_->next_);
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std::swap(next_->prev_, rhs.next_->prev_);
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}
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enum { destructiveCopy = false };
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private:
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mutable const RefLinkedBase* prev_;
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mutable const RefLinkedBase* next_;
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};
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}
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template <class P>
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class RefLinked : public Private::RefLinkedBase
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{
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public:
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RefLinked()
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{}
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template <class P1>
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RefLinked(const RefLinked<P1>& rhs)
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: Private::RefLinkedBase(rhs)
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{}
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static P Clone(const P& val)
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{ return val; }
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bool Release(const P&)
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{ return Private::RefLinkedBase::Release(); }
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template DestructiveCopy
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// Implementation of the OwnershipPolicy used by SmartPtr
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// Implements destructive copy semantics (a la std::auto_ptr)
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////////////////////////////////////////////////////////////////////////////////
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template <class P>
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class DestructiveCopy
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{
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public:
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DestructiveCopy()
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{}
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template <class P1>
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DestructiveCopy(const DestructiveCopy<P1>&)
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{}
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template <class P1>
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static P Clone(P1& val)
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{
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P result(val);
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val = P1();
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return result;
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}
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static bool Release(const P&)
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{ return true; }
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static void Swap(DestructiveCopy&)
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{}
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enum { destructiveCopy = true };
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template NoCopy
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// Implementation of the OwnershipPolicy used by SmartPtr
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// Implements a policy that doesn't allow copying objects
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////////////////////////////////////////////////////////////////////////////////
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template <class P>
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class NoCopy
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{
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public:
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NoCopy()
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{}
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template <class P1>
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NoCopy(const NoCopy<P1>&)
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{}
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static P Clone(const P&)
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{
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// Make it depended on template parameter
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static const bool DependedFalse = sizeof(P*) == 0;
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STATIC_CHECK(DependedFalse, This_Policy_Disallows_Value_Copying);
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}
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static bool Release(const P&)
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{ return true; }
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static void Swap(NoCopy&)
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{}
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enum { destructiveCopy = false };
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template AllowConversion
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// Implementation of the ConversionPolicy used by SmartPtr
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// Allows implicit conversion from SmartPtr to the pointee type
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////////////////////////////////////////////////////////////////////////////////
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struct AllowConversion
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{
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enum { allow = true };
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void Swap(AllowConversion&)
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{}
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template DisallowConversion
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// Implementation of the ConversionPolicy used by SmartPtr
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// Does not allow implicit conversion from SmartPtr to the pointee type
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// You can initialize a DisallowConversion with an AllowConversion
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////////////////////////////////////////////////////////////////////////////////
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struct DisallowConversion
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{
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DisallowConversion()
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{}
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DisallowConversion(const AllowConversion&)
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{}
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enum { allow = false };
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void Swap(DisallowConversion&)
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{}
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template NoCheck
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// Implementation of the CheckingPolicy used by SmartPtr
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// Well, it's clear what it does :o)
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////////////////////////////////////////////////////////////////////////////////
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template <class P>
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struct NoCheck
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{
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NoCheck()
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{}
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template <class P1>
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NoCheck(const NoCheck<P1>&)
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{}
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static void OnDefault(const P&)
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{}
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static void OnInit(const P&)
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{}
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static void OnDereference(const P&)
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{}
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static void Swap(NoCheck&)
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{}
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template AssertCheck
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// Implementation of the CheckingPolicy used by SmartPtr
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// Checks the pointer before dereference
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////////////////////////////////////////////////////////////////////////////////
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template <class P>
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struct AssertCheck
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{
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AssertCheck()
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{}
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template <class P1>
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AssertCheck(const AssertCheck<P1>&)
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{}
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template <class P1>
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AssertCheck(const NoCheck<P1>&)
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{}
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static void OnDefault(const P&)
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{}
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static void OnInit(const P&)
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{}
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static void OnDereference(P val)
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{ assert(val); (void)val; }
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static void Swap(AssertCheck&)
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{}
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template AssertCheckStrict
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// Implementation of the CheckingPolicy used by SmartPtr
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// Checks the pointer against zero upon initialization and before dereference
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// You can initialize an AssertCheckStrict with an AssertCheck
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////////////////////////////////////////////////////////////////////////////////
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template <class P>
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struct AssertCheckStrict
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{
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AssertCheckStrict()
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{}
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template <class U>
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AssertCheckStrict(const AssertCheckStrict<U>&)
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{}
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template <class U>
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AssertCheckStrict(const AssertCheck<U>&)
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{}
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template <class P1>
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AssertCheckStrict(const NoCheck<P1>&)
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{}
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static void OnDefault(P val)
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{ assert(val); }
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static void OnInit(P val)
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{ assert(val); }
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static void OnDereference(P val)
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{ assert(val); }
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static void Swap(AssertCheckStrict&)
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{}
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};
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////////////////////////////////////////////////////////////////////////////////
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// class NullPointerException
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// Used by some implementations of the CheckingPolicy used by SmartPtr
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////////////////////////////////////////////////////////////////////////////////
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struct NullPointerException : public std::runtime_error
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{
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NullPointerException() : std::runtime_error("")
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{ }
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const char* what() const throw()
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{ return "Null Pointer Exception"; }
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template RejectNullStatic
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// Implementation of the CheckingPolicy used by SmartPtr
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// Checks the pointer upon initialization and before dereference
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////////////////////////////////////////////////////////////////////////////////
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template <class P>
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struct RejectNullStatic
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{
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RejectNullStatic()
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{}
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template <class P1>
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RejectNullStatic(const RejectNullStatic<P1>&)
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{}
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template <class P1>
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RejectNullStatic(const NoCheck<P1>&)
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{}
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template <class P1>
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RejectNullStatic(const AssertCheck<P1>&)
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{}
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template <class P1>
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RejectNullStatic(const AssertCheckStrict<P1>&)
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{}
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static void OnDefault(const P&)
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{
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// Make it depended on template parameter
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static const bool DependedFalse = sizeof(P*) == 0;
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STATIC_CHECK(DependedFalse, ERROR_This_Policy_Does_Not_Allow_Default_Initialization);
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}
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static void OnInit(const P& val)
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{ if (!val) throw NullPointerException(); }
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static void OnDereference(const P& val)
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{ if (!val) throw NullPointerException(); }
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static void Swap(RejectNullStatic&)
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{}
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template RejectNull
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// Implementation of the CheckingPolicy used by SmartPtr
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// Checks the pointer before dereference
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////////////////////////////////////////////////////////////////////////////////
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template <class P>
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struct RejectNull
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{
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RejectNull()
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{}
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template <class P1>
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RejectNull(const RejectNull<P1>&)
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{}
|
|
|
|
static void OnInit(P val)
|
|
{ if (!val) throw NullPointerException(); }
|
|
|
|
static void OnDefault(P val)
|
|
{ OnInit(val); }
|
|
|
|
void OnDereference(P val)
|
|
{ OnInit(val); }
|
|
|
|
void Swap(RejectNull&)
|
|
{}
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// class template RejectNullStrict
|
|
// Implementation of the CheckingPolicy used by SmartPtr
|
|
// Checks the pointer upon initialization and before dereference
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template <class P>
|
|
struct RejectNullStrict
|
|
{
|
|
RejectNullStrict()
|
|
{}
|
|
|
|
template <class P1>
|
|
RejectNullStrict(const RejectNullStrict<P1>&)
|
|
{}
|
|
|
|
template <class P1>
|
|
RejectNullStrict(const RejectNull<P1>&)
|
|
{}
|
|
|
|
static void OnInit(P val)
|
|
{ if (!val) throw NullPointerException(); }
|
|
|
|
void OnDereference(P val)
|
|
{ OnInit(val); }
|
|
|
|
void Swap(RejectNullStrict&)
|
|
{}
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// class template ByRef
|
|
// Transports a reference as a value
|
|
// Serves to implement the Colvin/Gibbons trick for SmartPtr
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template <class T>
|
|
class ByRef
|
|
{
|
|
public:
|
|
ByRef(T& v) : value_(v) {}
|
|
operator T&() { return value_; }
|
|
// gcc doesn't like this:
|
|
// operator const T&() const { return value_; }
|
|
private:
|
|
ByRef& operator=(const ByRef &);
|
|
T& value_;
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// class template SmartPtr (declaration)
|
|
// The reason for all the fuss above
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OwnershipPolicy = RefCounted,
|
|
class ConversionPolicy = DisallowConversion,
|
|
template <class> class CheckingPolicy = AssertCheck,
|
|
template <class> class StoragePolicy = DefaultSPStorage
|
|
>
|
|
class SmartPtr;
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// class template SmartPtrDef (definition)
|
|
// this class added to unify the usage of SmartPtr
|
|
// instead of writing SmartPtr<T,OP,CP,KP,SP> write SmartPtrDef<T,OP,CP,KP,SP>::type
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OwnershipPolicy = RefCounted,
|
|
class ConversionPolicy = DisallowConversion,
|
|
template <class> class CheckingPolicy = AssertCheck,
|
|
template <class> class StoragePolicy = DefaultSPStorage
|
|
>
|
|
struct SmartPtrDef
|
|
{
|
|
typedef SmartPtr
|
|
<
|
|
T,
|
|
OwnershipPolicy,
|
|
ConversionPolicy,
|
|
CheckingPolicy,
|
|
StoragePolicy
|
|
>
|
|
type;
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// class template SmartPtr (definition)
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OwnershipPolicy,
|
|
class ConversionPolicy,
|
|
template <class> class CheckingPolicy,
|
|
template <class> class StoragePolicy
|
|
>
|
|
class SmartPtr
|
|
: public StoragePolicy<T>
|
|
, public OwnershipPolicy<typename StoragePolicy<T>::PointerType>
|
|
, public CheckingPolicy<typename StoragePolicy<T>::StoredType>
|
|
, public ConversionPolicy
|
|
{
|
|
typedef StoragePolicy<T> SP;
|
|
typedef OwnershipPolicy<typename StoragePolicy<T>::PointerType> OP;
|
|
typedef CheckingPolicy<typename StoragePolicy<T>::StoredType> KP;
|
|
typedef ConversionPolicy CP;
|
|
|
|
public:
|
|
typedef typename SP::PointerType PointerType;
|
|
typedef typename SP::StoredType StoredType;
|
|
typedef typename SP::ReferenceType ReferenceType;
|
|
|
|
typedef typename Select<OP::destructiveCopy,
|
|
SmartPtr, const SmartPtr>::Result
|
|
CopyArg;
|
|
|
|
private:
|
|
struct NeverMatched;
|
|
|
|
#ifdef LOKI_SMARTPTR_CONVERSION_CONSTRUCTOR_POLICY
|
|
typedef typename Select< CP::allow, const StoredType&, NeverMatched>::Result ImplicitArg;
|
|
typedef typename Select<!CP::allow, const StoredType&, NeverMatched>::Result ExplicitArg;
|
|
#else
|
|
typedef const StoredType& ImplicitArg;
|
|
typedef typename Select<false, const StoredType&, NeverMatched>::Result ExplicitArg;
|
|
#endif
|
|
|
|
public:
|
|
|
|
SmartPtr()
|
|
{ KP::OnDefault(GetImpl(*this)); }
|
|
|
|
explicit
|
|
SmartPtr(ExplicitArg p) : SP(p)
|
|
{ KP::OnInit(GetImpl(*this)); }
|
|
|
|
SmartPtr(ImplicitArg p) : SP(p)
|
|
{ KP::OnInit(GetImpl(*this)); }
|
|
|
|
SmartPtr(CopyArg& rhs)
|
|
: SP(rhs), OP(rhs), KP(rhs), CP(rhs)
|
|
{ GetImplRef(*this) = OP::Clone(GetImplRef(rhs)); }
|
|
|
|
template
|
|
<
|
|
typename T1,
|
|
template <class> class OP1,
|
|
class CP1,
|
|
template <class> class KP1,
|
|
template <class> class SP1
|
|
>
|
|
SmartPtr(const SmartPtr<T1, OP1, CP1, KP1, SP1>& rhs)
|
|
: SP(rhs), OP(rhs), KP(rhs), CP(rhs)
|
|
{ GetImplRef(*this) = OP::Clone(GetImplRef(rhs)); }
|
|
|
|
template
|
|
<
|
|
typename T1,
|
|
template <class> class OP1,
|
|
class CP1,
|
|
template <class> class KP1,
|
|
template <class> class SP1
|
|
>
|
|
SmartPtr(SmartPtr<T1, OP1, CP1, KP1, SP1>& rhs)
|
|
: SP(rhs), OP(rhs), KP(rhs), CP(rhs)
|
|
{ GetImplRef(*this) = OP::Clone(GetImplRef(rhs)); }
|
|
|
|
SmartPtr(ByRef<SmartPtr> rhs)
|
|
: SP(rhs), OP(rhs), KP(rhs), CP(rhs)
|
|
{}
|
|
|
|
operator ByRef<SmartPtr>()
|
|
{ return ByRef<SmartPtr>(*this); }
|
|
|
|
SmartPtr& operator=(CopyArg& rhs)
|
|
{
|
|
SmartPtr temp(rhs);
|
|
temp.Swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
template
|
|
<
|
|
typename T1,
|
|
template <class> class OP1,
|
|
class CP1,
|
|
template <class> class KP1,
|
|
template <class> class SP1
|
|
>
|
|
SmartPtr& operator=(const SmartPtr<T1, OP1, CP1, KP1, SP1>& rhs)
|
|
{
|
|
SmartPtr temp(rhs);
|
|
temp.Swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
template
|
|
<
|
|
typename T1,
|
|
template <class> class OP1,
|
|
class CP1,
|
|
template <class> class KP1,
|
|
template <class> class SP1
|
|
>
|
|
SmartPtr& operator=(SmartPtr<T1, OP1, CP1, KP1, SP1>& rhs)
|
|
{
|
|
SmartPtr temp(rhs);
|
|
temp.Swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
void Swap(SmartPtr& rhs)
|
|
{
|
|
OP::Swap(rhs);
|
|
CP::Swap(rhs);
|
|
KP::Swap(rhs);
|
|
SP::Swap(rhs);
|
|
}
|
|
|
|
~SmartPtr()
|
|
{
|
|
if (OP::Release(GetImpl(*static_cast<SP*>(this))))
|
|
{
|
|
SP::Destroy();
|
|
}
|
|
}
|
|
|
|
friend inline void Release(SmartPtr& sp, typename SP::StoredType& p)
|
|
{
|
|
p = GetImplRef(sp);
|
|
GetImplRef(sp) = SP::Default();
|
|
}
|
|
|
|
friend inline void Reset(SmartPtr& sp, typename SP::StoredType p)
|
|
{ SmartPtr(p).Swap(sp); }
|
|
|
|
PointerType operator->()
|
|
{
|
|
KP::OnDereference(GetImplRef(*this));
|
|
return SP::operator->();
|
|
}
|
|
|
|
PointerType operator->() const
|
|
{
|
|
KP::OnDereference(GetImplRef(*this));
|
|
return SP::operator->();
|
|
}
|
|
|
|
ReferenceType operator*()
|
|
{
|
|
KP::OnDereference(GetImplRef(*this));
|
|
return SP::operator*();
|
|
}
|
|
|
|
ReferenceType operator*() const
|
|
{
|
|
KP::OnDereference(GetImplRef(*this));
|
|
return SP::operator*();
|
|
}
|
|
|
|
bool operator!() const // Enables "if (!sp) ..."
|
|
{ return GetImpl(*this) == 0; }
|
|
|
|
|
|
// Ambiguity buster
|
|
template
|
|
<
|
|
typename T1,
|
|
template <class> class OP1,
|
|
class CP1,
|
|
template <class> class KP1,
|
|
template <class> class SP1
|
|
>
|
|
bool operator==(const SmartPtr<T1, OP1, CP1, KP1, SP1>& rhs) const
|
|
{ return GetImpl(*this) == GetImpl(rhs); }
|
|
|
|
// Ambiguity buster
|
|
template
|
|
<
|
|
typename T1,
|
|
template <class> class OP1,
|
|
class CP1,
|
|
template <class> class KP1,
|
|
template <class> class SP1
|
|
>
|
|
bool operator!=(const SmartPtr<T1, OP1, CP1, KP1, SP1>& rhs) const
|
|
{ return !(*this == rhs); }
|
|
|
|
// Ambiguity buster
|
|
template
|
|
<
|
|
typename T1,
|
|
template <class> class OP1,
|
|
class CP1,
|
|
template <class> class KP1,
|
|
template <class> class SP1
|
|
>
|
|
bool operator<(const SmartPtr<T1, OP1, CP1, KP1, SP1>& rhs) const
|
|
{ return GetImpl(*this) < GetImpl(rhs); }
|
|
|
|
private:
|
|
// Helper for enabling 'if (sp)'
|
|
struct Tester
|
|
{
|
|
Tester(int) {}
|
|
void dummy() {}
|
|
};
|
|
|
|
typedef void (Tester::*unspecified_boolean_type_)();
|
|
|
|
typedef typename Select<CP::allow, Tester, unspecified_boolean_type_>::Result
|
|
unspecified_boolean_type;
|
|
|
|
public:
|
|
// enable 'if (sp)'
|
|
operator unspecified_boolean_type() const
|
|
{
|
|
return !*this ? 0 : &Tester::dummy;
|
|
}
|
|
|
|
private:
|
|
// Helper for disallowing automatic conversion
|
|
struct Insipid
|
|
{
|
|
Insipid(PointerType) {}
|
|
};
|
|
|
|
typedef typename Select<CP::allow, PointerType, Insipid>::Result
|
|
AutomaticConversionResult;
|
|
|
|
public:
|
|
operator AutomaticConversionResult() const
|
|
{ return GetImpl(*this); }
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// free comparison operators for class template SmartPtr
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// operator== for lhs = SmartPtr, rhs = raw pointer
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP,
|
|
typename U
|
|
>
|
|
inline bool operator==(const SmartPtr<T, OP, CP, KP, SP>& lhs,
|
|
U* rhs)
|
|
{ return GetImpl(lhs) == rhs; }
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// operator== for lhs = raw pointer, rhs = SmartPtr
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP,
|
|
typename U
|
|
>
|
|
inline bool operator==(U* lhs,
|
|
const SmartPtr<T, OP, CP, KP, SP>& rhs)
|
|
{ return rhs == lhs; }
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// operator!= for lhs = SmartPtr, rhs = raw pointer
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP,
|
|
typename U
|
|
>
|
|
inline bool operator!=(const SmartPtr<T, OP, CP, KP, SP>& lhs,
|
|
U* rhs)
|
|
{ return !(lhs == rhs); }
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// operator!= for lhs = raw pointer, rhs = SmartPtr
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP,
|
|
typename U
|
|
>
|
|
inline bool operator!=(U* lhs,
|
|
const SmartPtr<T, OP, CP, KP, SP>& rhs)
|
|
{ return rhs != lhs; }
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// operator< for lhs = SmartPtr, rhs = raw pointer -- NOT DEFINED
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP,
|
|
typename U
|
|
>
|
|
inline bool operator<(const SmartPtr<T, OP, CP, KP, SP>& lhs,
|
|
U* rhs);
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// operator< for lhs = raw pointer, rhs = SmartPtr -- NOT DEFINED
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP,
|
|
typename U
|
|
>
|
|
inline bool operator<(U* lhs,
|
|
const SmartPtr<T, OP, CP, KP, SP>& rhs);
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// operator> for lhs = SmartPtr, rhs = raw pointer -- NOT DEFINED
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP,
|
|
typename U
|
|
>
|
|
inline bool operator>(const SmartPtr<T, OP, CP, KP, SP>& lhs,
|
|
U* rhs)
|
|
{ return rhs < lhs; }
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// operator> for lhs = raw pointer, rhs = SmartPtr
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP,
|
|
typename U
|
|
>
|
|
inline bool operator>(U* lhs,
|
|
const SmartPtr<T, OP, CP, KP, SP>& rhs)
|
|
{ return rhs < lhs; }
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// operator<= for lhs = SmartPtr, rhs = raw pointer
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP,
|
|
typename U
|
|
>
|
|
inline bool operator<=(const SmartPtr<T, OP, CP, KP, SP>& lhs,
|
|
U* rhs)
|
|
{ return !(rhs < lhs); }
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// operator<= for lhs = raw pointer, rhs = SmartPtr
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP,
|
|
typename U
|
|
>
|
|
inline bool operator<=(U* lhs,
|
|
const SmartPtr<T, OP, CP, KP, SP>& rhs)
|
|
{ return !(rhs < lhs); }
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// operator>= for lhs = SmartPtr, rhs = raw pointer
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP,
|
|
typename U
|
|
>
|
|
inline bool operator>=(const SmartPtr<T, OP, CP, KP, SP>& lhs,
|
|
U* rhs)
|
|
{ return !(lhs < rhs); }
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// operator>= for lhs = raw pointer, rhs = SmartPtr
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP,
|
|
typename U
|
|
>
|
|
inline bool operator>=(U* lhs,
|
|
const SmartPtr<T, OP, CP, KP, SP>& rhs)
|
|
{ return !(lhs < rhs); }
|
|
|
|
} // namespace Loki
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// specialization of std::less for SmartPtr
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
namespace std
|
|
{
|
|
template
|
|
<
|
|
typename T,
|
|
template <class> class OP,
|
|
class CP,
|
|
template <class> class KP,
|
|
template <class> class SP
|
|
>
|
|
struct less< Loki::SmartPtr<T, OP, CP, KP, SP> >
|
|
: public binary_function<Loki::SmartPtr<T, OP, CP, KP, SP>,
|
|
Loki::SmartPtr<T, OP, CP, KP, SP>, bool>
|
|
{
|
|
bool operator()(const Loki::SmartPtr<T, OP, CP, KP, SP>& lhs,
|
|
const Loki::SmartPtr<T, OP, CP, KP, SP>& rhs) const
|
|
{ return less<T*>()(GetImpl(lhs), GetImpl(rhs)); }
|
|
};
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Change log:
|
|
// June 20, 2001: ported by Nick Thurn to gcc 2.95.3. Kudos, Nick!!!
|
|
// December 09, 2001: Included <cassert>
|
|
// February 2, 2003: fixed dependent names - credit due to Rani Sharoni
|
|
// August 21, 2003: Added support for policy based explicit/implicit constructor.
|
|
// The new code will be effective if a macro named
|
|
// *** LOKI_SMARTPTR_CONVERSION_CONSTRUCTOR_POLICY ***
|
|
// is defined (due to backward computability concerns).
|
|
// In case that the macro is defined and the conversion policy allow flag is off
|
|
// (e.g. DisallowConversion) then the conversion from the "pointer" to the
|
|
// SmartPtr must be explicit.
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#endif // SMARTPTR_INC_
|