849 lines
25 KiB
C
849 lines
25 KiB
C
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////////////////////////////////////////////////////////////////////////////////
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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-Welsey 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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// Last update: Mar 21, 2003
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// Added a new explicit template argument specification workaround for
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// FnDispatcher::Add which is more compliant with other
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// explicit template argument specification workarounds used in this port.
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//
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// Example usage:
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// --------------
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// Using the original library one writes:
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// typedef FnDispatcher<Shape> Dispatcher;
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// void Hatch(Rectangle& lhs, Poly& rhs) {...}
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//
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// Dispatcher dis;
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// disp.Add<Rectangle, Poly, &Hatch>();
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//
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// Using this port the example either becomes:
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// dis.Add(Dispatcher::Add<Rectangle, Poly, &Hatch>());
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// or alternatively
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// Dispatcher::AddI<Rectangle, Poly, &Hatch>()(dis);
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//
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// All dispatchers now have void as default value for return types.
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// All dispatchers now support void as return type.
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//
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//
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// The port now uses Tye2Type-parameters instead of plain pointers as
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// a workaround of VC's explicit template argument specification bug.
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//
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// For example:
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// The original declaration of BasicDispatcher::Add looks like this:
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//
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// template <class SomeLhs, class SomeRhs>
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// void Add(CallbackType fun);
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//
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// and you call it like this:
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// obj.Add<Type1, Type2>(yourFun);
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//
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// This port uses:
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//
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// template <class SomeLhs, class SomeRhs>
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// void Add(CallbackType fun, Type2Type<SomeLhs>, Type2Type<SomeRhs>);
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//
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// and you call it like this:
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// obj.Add(yourFun, Type2Type<Type1>(), Type2Type<Type2>());
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#ifndef MULTIMETHODS_INC_
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#define MULTIMETHODS_INC_
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#include "Typelist.h"
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#include "LokiTypeInfo.h"
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#include "Functor.h"
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#include "AssocVector.h"
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////////////////////////////////////////////////////////////////////////////////
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// IMPORTANT NOTE:
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// The double dispatchers implemented below differ from the excerpts shown in
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// the book - they are simpler while respecting the same interface.
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////////////////////////////////////////////////////////////////////////////////
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namespace Loki
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{
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////////////////////////////////////////////////////////////////////////////////
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// Implementation helpers for StaticDispatcher
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////////////////////////////////////////////////////////////////////////////////
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namespace Private
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{
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template <class SomeLhs, class SomeRhs, class Executor, typename ResultType>
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struct InvocationTraitsBase
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{
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protected:
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template <class R>
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struct BaseImpl
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{
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static ResultType
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DoDispatch(SomeLhs& lhs, SomeRhs& rhs, Executor& exec, Int2Type<false>)
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{
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return exec.Fire(lhs, rhs);
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}
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static ResultType DoDispatch( SomeLhs& lhs, SomeRhs& rhs,
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Executor& exec, Int2Type<true>)
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{
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return exec.Fire(rhs, lhs);
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}
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};
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template <>
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struct BaseImpl<void>
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{
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static ResultType
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DoDispatch(SomeLhs& lhs, SomeRhs& rhs, Executor& exec, Int2Type<false>)
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{
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exec.Fire(lhs, rhs);
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}
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static ResultType DoDispatch( SomeLhs& lhs, SomeRhs& rhs,
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Executor& exec, Int2Type<true>)
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{
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exec.Fire(rhs, lhs);
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}
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};
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public:
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typedef BaseImpl<ResultType> Base;
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};
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template <class SomeLhs, class SomeRhs, class Executor, typename ResultType>
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struct InvocationTraits : public InvocationTraitsBase
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<SomeLhs, SomeRhs, Executor, ResultType>::Base
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{
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};
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template<class Executor, class BaseLhs, class TypesLhs, bool symmetric,
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class BaseRhs, class TypesRhs, typename ResultType>
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class StaticDispatcherBase
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{
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private:
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// Base for ResultType != void
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template <class R>
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class In
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{
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template <class SomeLhs>
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static ResultType DispatchRhs( SomeLhs& lhs, BaseRhs& rhs,
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Executor exec, NullType)
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{ return exec.OnError(lhs, rhs); }
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template <class Head, class Tail, class SomeLhs>
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static ResultType DispatchRhs(SomeLhs& lhs, BaseRhs& rhs,
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Executor exec, Typelist<Head, Tail>)
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{
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if (Head* p2 = dynamic_cast<Head*>(&rhs))
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{
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Int2Type<(symmetric &&
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int(TL::IndexOf<TypesRhs, Head>::value) <
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int(TL::IndexOf<TypesLhs, SomeLhs>::value))> i2t;
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typedef Private::InvocationTraits<
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SomeLhs, Head, Executor, ResultType> CallTraits;
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return CallTraits::DoDispatch(lhs, *p2, exec, i2t);
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}
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return DispatchRhs(lhs, rhs, exec, Tail());
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}
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static ResultType DispatchLhs( BaseLhs& lhs, BaseRhs& rhs,
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Executor exec, NullType)
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{ return exec.OnError(lhs, rhs); }
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template <class Head, class Tail>
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static ResultType DispatchLhs( BaseLhs& lhs, BaseRhs& rhs,
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Executor exec, Typelist<Head, Tail>)
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{
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if (Head* p1 = dynamic_cast<Head*>(&lhs))
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{
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return DispatchRhs(*p1, rhs, exec, TypesRhs());
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}
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return DispatchLhs(lhs, rhs, exec, Tail());
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}
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protected:
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~In() {}
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public:
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static ResultType Go( BaseLhs& lhs, BaseRhs& rhs,
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Executor exec)
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{ return DispatchLhs(lhs, rhs, exec, TypesLhs()); }
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}; // In<R>
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// Base for ResultType == void
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template <>
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class In<void>
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{
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template <class SomeLhs>
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static ResultType DispatchRhs( SomeLhs& lhs, BaseRhs& rhs,
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Executor exec, NullType)
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{ exec.OnError(lhs, rhs); }
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template <class Head, class Tail, class SomeLhs>
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static ResultType DispatchRhs(SomeLhs& lhs, BaseRhs& rhs,
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Executor exec, Typelist<Head, Tail>)
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{
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if (Head* p2 = dynamic_cast<Head*>(&rhs))
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{
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Int2Type<(symmetric &&
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int(TL::IndexOf<TypesRhs, Head>::value) <
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int(TL::IndexOf<TypesLhs, SomeLhs>::value))> i2t;
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typedef Private::InvocationTraits<
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SomeLhs, Head, Executor, void> CallTraits;
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CallTraits::DoDispatch(lhs, *p2, exec, i2t);
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return;
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}
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DispatchRhs(lhs, rhs, exec, Tail());
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}
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static ResultType DispatchLhs( BaseLhs& lhs, BaseRhs& rhs,
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Executor exec, NullType)
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{ exec.OnError(lhs, rhs); }
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template <class Head, class Tail>
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static ResultType DispatchLhs( BaseLhs& lhs, BaseRhs& rhs,
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Executor exec, Typelist<Head, Tail>)
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{
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if (Head* p1 = dynamic_cast<Head*>(&lhs))
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{
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DispatchRhs(*p1, rhs, exec, TypesRhs());
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return;
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}
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DispatchLhs(lhs, rhs, exec, Tail());
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}
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protected:
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~In<void>() {}
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public:
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static ResultType Go( BaseLhs& lhs, BaseRhs& rhs,
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Executor exec)
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{ DispatchLhs(lhs, rhs, exec, TypesLhs()); }
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}; // In<void>
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public:
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typedef In<ResultType> Base;
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}; // StaticDispatcherBase
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} // namespace Private
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////////////////////////////////////////////////////////////////////////////////
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// class template StaticDispatcher
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// Implements an automatic static double dispatcher based on two typelists
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////////////////////////////////////////////////////////////////////////////////
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template
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<
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class Executor,
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class BaseLhs,
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class TypesLhs,
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bool symmetric = true,
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class BaseRhs = BaseLhs,
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class TypesRhs = TypesLhs,
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typename ResultType = Loki::Private::VoidWrap::type
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>
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class StaticDispatcher : public ::Loki::Private::StaticDispatcherBase
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<
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Executor, BaseLhs, TypesLhs, symmetric,
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BaseRhs, TypesRhs, ResultType
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>::Base
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{
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public:
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// member functions moved to base class
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// static ResultType Go( BaseLhs& lhs, BaseRhs& rhs,
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// Executor exec)
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};
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////////////////////////////////////////////////////////////////////////////////
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// Implementation helpers for BasicDispatcher
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////////////////////////////////////////////////////////////////////////////////
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namespace Private
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{
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template <class BaseLhs, class BaseRhs, typename ResultType,
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typename CallbackType>
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class BasicDispatcherBase
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{
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private:
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// Common (independent of the result type) code for BasicDispatcher
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class Common
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{
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private:
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void DoAdd(TypeInfo lhs, TypeInfo rhs, CallbackType fun)
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{
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callbackMap_[KeyType(lhs, rhs)] = fun;
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}
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bool DoRemove(TypeInfo lhs, TypeInfo rhs)
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{
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return callbackMap_.erase(KeyType(lhs, rhs)) == 1;
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}
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protected:
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typedef std::pair<TypeInfo,TypeInfo> KeyType;
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typedef CallbackType MappedType;
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typedef AssocVector<KeyType, MappedType> MapType;
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MapType callbackMap_;
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~Common() {}
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public:
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template <class SomeLhs, class SomeRhs>
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void Add(CallbackType fun, ::Loki::Type2Type<SomeLhs>,
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::Loki::Type2Type<SomeRhs>)
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{
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DoAdd(typeid(SomeLhs), typeid(SomeRhs), fun);
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}
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template <class SomeLhs, class SomeRhs>
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bool Remove(::Loki::Type2Type<SomeLhs>, ::Loki::Type2Type<SomeRhs>)
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{
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return DoRemove(typeid(SomeLhs), typeid(SomeRhs));
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}
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}; // Common
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template <class R> // Base for ResultType != void
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class In : public Common
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{
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public:
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ResultType Go(BaseLhs& lhs, BaseRhs& rhs)
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{
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typename MapType::key_type k(typeid(lhs),typeid(rhs));
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typename MapType::iterator i = Common::callbackMap_.find(k);
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if (i == Common::callbackMap_.end())
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{
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throw std::runtime_error("Function not found");
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}
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return (i->second)(lhs, rhs);
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}
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protected:
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~In() {}
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}; // In
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template <> // Base for ResultType == void
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class In<void> : public Common
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{
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public:
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ResultType Go(BaseLhs& lhs, BaseRhs& rhs)
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{
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typename MapType::key_type k(typeid(lhs),typeid(rhs));
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typename MapType::iterator i = Common::callbackMap_.find(k);
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if (i == Common::callbackMap_.end())
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{
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throw std::runtime_error("Function not found");
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}
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(i->second)(lhs, rhs);
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}
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protected:
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~In<void>() {}
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}; // In
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|
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public:
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typedef In<ResultType> Base;
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}; // BasicDispatcherBase
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} // namespace Private
|
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|
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////////////////////////////////////////////////////////////////////////////////
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||
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// class template BasicDispatcher
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||
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// Implements a logarithmic double dispatcher for functors (or functions)
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// Doesn't offer automated casts or symmetry
|
||
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////////////////////////////////////////////////////////////////////////////////
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||
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template
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||
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<
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class BaseLhs,
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class BaseRhs = BaseLhs,
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typename ResultType = Loki::Private::VoidWrap::type,
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typename CallbackType = ResultType (*)(BaseLhs&, BaseRhs&)
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>
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class BasicDispatcher : public ::Loki::Private::BasicDispatcherBase
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||
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<
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BaseLhs, BaseRhs, ResultType, CallbackType
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>::Base
|
||
|
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{
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||
|
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public:
|
||
|
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// member functions moved to base class
|
||
|
|
// template <class SomeLhs, class SomeRhs>
|
||
|
|
// void Add(CallbackType fun, ::Loki::Type2Type<SomeLhs>,
|
||
|
|
// ::Loki::Type2Type<SomeRhs>)
|
||
|
|
//
|
||
|
|
// template <class SomeLhs, class SomeRhs>
|
||
|
|
// bool Remove(::Loki::Type2Type<SomeLhs>, ::Loki::Type2Type<SomeRhs>)
|
||
|
|
//
|
||
|
|
// ResultType Go(BaseLhs& lhs, BaseRhs& rhs);
|
||
|
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};
|
||
|
|
|
||
|
|
|
||
|
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struct BasicDispatcherWrapper
|
||
|
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{
|
||
|
|
template <class T, class U, class V, class W>
|
||
|
|
struct In
|
||
|
|
{
|
||
|
|
typedef BasicDispatcher<T, U, V, W> type;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// class template StaticCaster
|
||
|
|
// Implementation of the CastingPolicy used by FunctorDispatcher
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
template <class To, class From>
|
||
|
|
struct StaticCaster
|
||
|
|
{
|
||
|
|
static To& Cast(From& obj)
|
||
|
|
{
|
||
|
|
return static_cast<To&>(obj);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
struct StaticCasterWrapper
|
||
|
|
{
|
||
|
|
template <class T, class U>
|
||
|
|
struct In
|
||
|
|
{
|
||
|
|
typedef StaticCaster<T, U> type;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// class template DynamicCaster
|
||
|
|
// Implementation of the CastingPolicy used by FunctorDispatcher
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
template <class To, class From>
|
||
|
|
struct DynamicCaster
|
||
|
|
{
|
||
|
|
static To& Cast(From& obj)
|
||
|
|
{
|
||
|
|
return dynamic_cast<To&>(obj);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
struct DynamicCasterWrapper
|
||
|
|
{
|
||
|
|
template <class T, class U>
|
||
|
|
struct In
|
||
|
|
{
|
||
|
|
typedef DynamicCaster<T, U> type;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// class template Private::FnDispatcherHelper
|
||
|
|
// Implements trampolines and argument swapping used by FnDispatcher
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
namespace Private
|
||
|
|
{
|
||
|
|
template <class BaseLhs, class BaseRhs, typename ResultType,
|
||
|
|
class DispatcherBackend>
|
||
|
|
class FnDispatcherBase
|
||
|
|
{
|
||
|
|
private:
|
||
|
|
// Implementation for ResultType != void
|
||
|
|
template <class R>
|
||
|
|
class In
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
ApplyInnerType4<DispatcherBackend, BaseLhs, BaseRhs, ResultType,
|
||
|
|
ResultType (*)(BaseLhs&, BaseRhs&)>::type backEnd_;
|
||
|
|
|
||
|
|
ResultType Go(BaseLhs& lhs, BaseRhs& rhs)
|
||
|
|
{
|
||
|
|
return backEnd_.Go(lhs, rhs);
|
||
|
|
}
|
||
|
|
protected:
|
||
|
|
~In() {}
|
||
|
|
}; // In
|
||
|
|
// Implementation for ResultType == void
|
||
|
|
template <>
|
||
|
|
class In<void>
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
ApplyInnerType4<DispatcherBackend, BaseLhs, BaseRhs, ResultType,
|
||
|
|
ResultType (*)(BaseLhs&, BaseRhs&)>::type backEnd_;
|
||
|
|
|
||
|
|
ResultType Go(BaseLhs& lhs, BaseRhs& rhs)
|
||
|
|
{
|
||
|
|
backEnd_.Go(lhs, rhs);
|
||
|
|
}
|
||
|
|
protected:
|
||
|
|
~In<void>() {}
|
||
|
|
}; // In<void>
|
||
|
|
public:
|
||
|
|
typedef In<ResultType> Base;
|
||
|
|
}; // FnDispatcherBase
|
||
|
|
|
||
|
|
template< class BaseLhs, class BaseRhs, class SomeLhs, class SomeRhs,
|
||
|
|
class ResultType, class CastLhs, class CastRhs,
|
||
|
|
void (*Callback)(SomeLhs&, SomeRhs&)>
|
||
|
|
class FnDispatcherHelperBase
|
||
|
|
{
|
||
|
|
private:
|
||
|
|
template <class R>
|
||
|
|
class In
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
static ResultType Trampoline(BaseLhs& lhs, BaseRhs& rhs)
|
||
|
|
{
|
||
|
|
return Callback(CastLhs::Cast(lhs), CastRhs::Cast(rhs));
|
||
|
|
}
|
||
|
|
static ResultType TrampolineR(BaseRhs& rhs, BaseLhs& lhs)
|
||
|
|
{
|
||
|
|
return Trampoline(lhs, rhs);
|
||
|
|
}
|
||
|
|
protected:
|
||
|
|
~In() {}
|
||
|
|
};
|
||
|
|
template <>
|
||
|
|
class In<void>
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
static ResultType Trampoline(BaseLhs& lhs, BaseRhs& rhs)
|
||
|
|
{
|
||
|
|
Callback(CastLhs::Cast(lhs), CastRhs::Cast(rhs));
|
||
|
|
}
|
||
|
|
static ResultType TrampolineR(BaseRhs& rhs, BaseLhs& lhs)
|
||
|
|
{
|
||
|
|
Trampoline(lhs, rhs);
|
||
|
|
}
|
||
|
|
protected:
|
||
|
|
~In<void>() {}
|
||
|
|
};
|
||
|
|
public:
|
||
|
|
typedef In<ResultType> Base;
|
||
|
|
};
|
||
|
|
|
||
|
|
template
|
||
|
|
<
|
||
|
|
class BaseLhs, class BaseRhs, class SomeLhs, class SomeRhs,
|
||
|
|
typename ResultType, class CastLhs, class CastRhs,
|
||
|
|
ResultType (*Callback)(SomeLhs&, SomeRhs&)
|
||
|
|
>
|
||
|
|
struct FnDispatcherHelper : public FnDispatcherHelperBase
|
||
|
|
<
|
||
|
|
BaseLhs, BaseRhs, SomeLhs, SomeRhs,
|
||
|
|
ResultType, CastLhs, CastRhs, Callback
|
||
|
|
>::Base
|
||
|
|
{};
|
||
|
|
}
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// class template FnDispatcher
|
||
|
|
// Implements an automatic logarithmic double dispatcher for functions
|
||
|
|
// Features automated conversions
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
template <class BaseLhs, class BaseRhs = BaseLhs,
|
||
|
|
typename ResultType = Loki::Private::VoidWrap::type,
|
||
|
|
class CastingPolicy = DynamicCasterWrapper,
|
||
|
|
class DispatcherBackend = BasicDispatcherWrapper>
|
||
|
|
class FnDispatcher : public ::Loki::Private::FnDispatcherBase
|
||
|
|
<
|
||
|
|
BaseLhs, BaseRhs,
|
||
|
|
ResultType, DispatcherBackend
|
||
|
|
>::Base
|
||
|
|
|
||
|
|
{
|
||
|
|
typedef typename ::Loki::Private::FnDispatcherBase
|
||
|
|
<
|
||
|
|
BaseLhs, BaseRhs, ResultType, DispatcherBackend
|
||
|
|
>::Base Base;
|
||
|
|
public:
|
||
|
|
template <class SomeLhs, class SomeRhs>
|
||
|
|
void Add(ResultType (*pFun)(BaseLhs&, BaseRhs&),
|
||
|
|
::Loki::Type2Type<SomeLhs>,
|
||
|
|
::Loki::Type2Type<SomeRhs>)
|
||
|
|
{
|
||
|
|
Base::backEnd_.Add(pFun, ::Loki::Type2Type<SomeLhs>(),
|
||
|
|
::Loki::Type2Type<SomeRhs>());
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// two different workarounds for FnDispatcher::Add
|
||
|
|
// Using the first one writes:
|
||
|
|
// DisType dispatcher;
|
||
|
|
// dispatcher.Add(DisType::Etas<SomeLhs, SomeRhs, &AFunc>());
|
||
|
|
// using the second workaround the call becomes:
|
||
|
|
// DisType dispatcher;
|
||
|
|
// DisTyp::AddI<SomeLhs, SomeRhs, &AFunc>()(dispatcher);
|
||
|
|
|
||
|
|
// Helper-class for the first workaround.
|
||
|
|
// When calling FnDispatcher::Add provide an object of this type
|
||
|
|
// as argument.
|
||
|
|
template <class SomeLhs, class SomeRhs,
|
||
|
|
ResultType (*callback)(SomeLhs&, SomeRhs&), bool symmetric = false>
|
||
|
|
struct Etas
|
||
|
|
{
|
||
|
|
typedef Private::FnDispatcherHelper<
|
||
|
|
BaseLhs, BaseRhs, SomeLhs, SomeRhs, ResultType,
|
||
|
|
ApplyInnerType2<CastingPolicy, SomeLhs,BaseLhs>::type,
|
||
|
|
ApplyInnerType2<CastingPolicy,SomeRhs,BaseRhs>::type,
|
||
|
|
callback> Local;
|
||
|
|
enum {sym = symmetric};
|
||
|
|
typedef SomeLhs Lhs;
|
||
|
|
typedef SomeRhs Rhs;
|
||
|
|
};
|
||
|
|
|
||
|
|
// EtasType has to be a template parameter. If one tries to use
|
||
|
|
// a parameter of type Etas the MSVC 6.0 won't generate correct
|
||
|
|
// code.
|
||
|
|
template <class EtasType>
|
||
|
|
void Add(EtasType EtasObj)
|
||
|
|
{
|
||
|
|
typedef typename EtasType::Local Local;
|
||
|
|
typedef typename EtasType::Lhs SomeLhs;
|
||
|
|
typedef typename EtasType::Rhs SomeRhs;
|
||
|
|
|
||
|
|
Add(&Local::Trampoline, ::Loki::Type2Type<SomeLhs>(),
|
||
|
|
::Loki::Type2Type<SomeRhs>());
|
||
|
|
if (EtasType::sym)
|
||
|
|
{
|
||
|
|
Add(&Local::TrampolineR, ::Loki::Type2Type<SomeRhs>(),
|
||
|
|
::Loki::Type2Type<SomeLhs>());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// alternative workaround for FnDispatcher::Add
|
||
|
|
template <class SomeLhs, class SomeRhs,
|
||
|
|
ResultType (*callback)(SomeLhs&, SomeRhs&), bool symmetric = false>
|
||
|
|
struct AddI
|
||
|
|
{
|
||
|
|
void operator()(FnDispatcher<BaseLhs, BaseRhs, ResultType,
|
||
|
|
CastingPolicy,DispatcherBackend>& f)
|
||
|
|
{
|
||
|
|
typedef Private::FnDispatcherHelper<
|
||
|
|
BaseLhs, BaseRhs, SomeLhs, SomeRhs, ResultType,
|
||
|
|
ApplyInnerType2<CastingPolicy, SomeLhs,BaseLhs>::type,
|
||
|
|
ApplyInnerType2<CastingPolicy,SomeRhs,BaseRhs>::type,
|
||
|
|
callback> Local;
|
||
|
|
f.Add(&Local::Trampoline, ::Loki::Type2Type<SomeLhs>(),
|
||
|
|
::Loki::Type2Type<SomeRhs>());
|
||
|
|
if (symmetric)
|
||
|
|
{
|
||
|
|
f.Add(&Local::TrampolineR, ::Loki::Type2Type<SomeRhs>(),
|
||
|
|
::Loki::Type2Type<SomeLhs>());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
template <class SomeLhs, class SomeRhs>
|
||
|
|
void Remove(::Loki::Type2Type<SomeLhs>, ::Loki::Type2Type<SomeRhs>)
|
||
|
|
{
|
||
|
|
Base::backEnd_.Remove(::Loki::Type2Type<SomeLhs>(),
|
||
|
|
::Loki::Type2Type<SomeRhs>());
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// moved to base class
|
||
|
|
// ResultType Go(BaseLhs& lhs, BaseRhs& rhs);
|
||
|
|
};
|
||
|
|
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// class template FunctorDispatcherAdaptor
|
||
|
|
// permits use of FunctorDispatcher under gcc.2.95.2/3
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
namespace Private
|
||
|
|
{
|
||
|
|
template <class BaseLhs, class BaseRhs, class SomeLhs, class SomeRhs,
|
||
|
|
typename ResultType, class CastLhs, class CastRhs, class Fun, bool SwapArgs>
|
||
|
|
class FunctorDispatcherHelperBase
|
||
|
|
{
|
||
|
|
template <class R>
|
||
|
|
class In
|
||
|
|
{
|
||
|
|
Fun fun_;
|
||
|
|
ResultType Fire(BaseLhs& lhs, BaseRhs& rhs,Int2Type<false>)
|
||
|
|
{
|
||
|
|
return fun_(CastLhs::Cast(lhs), CastRhs::Cast(rhs));
|
||
|
|
}
|
||
|
|
ResultType Fire(BaseLhs& rhs, BaseRhs& lhs,Int2Type<true>)
|
||
|
|
{
|
||
|
|
return fun_(CastLhs::Cast(lhs), CastRhs::Cast(rhs));
|
||
|
|
}
|
||
|
|
public:
|
||
|
|
In(const Fun& fun) : fun_(fun) {}
|
||
|
|
|
||
|
|
ResultType operator()(BaseLhs& lhs, BaseRhs& rhs)
|
||
|
|
{
|
||
|
|
return Fire(lhs,rhs,Int2Type<SwapArgs>());
|
||
|
|
}
|
||
|
|
};
|
||
|
|
template <>
|
||
|
|
class In<void>
|
||
|
|
{
|
||
|
|
Fun fun_;
|
||
|
|
ResultType Fire(BaseLhs& lhs, BaseRhs& rhs,Int2Type<false>)
|
||
|
|
{
|
||
|
|
fun_(CastLhs::Cast(lhs), CastRhs::Cast(rhs));
|
||
|
|
}
|
||
|
|
ResultType Fire(BaseLhs& rhs, BaseRhs& lhs,Int2Type<true>)
|
||
|
|
{
|
||
|
|
fun_(CastLhs::Cast(lhs), CastRhs::Cast(rhs));
|
||
|
|
}
|
||
|
|
public:
|
||
|
|
In<void>(const Fun& fun) : fun_(fun) {}
|
||
|
|
|
||
|
|
ResultType operator()(BaseLhs& lhs, BaseRhs& rhs)
|
||
|
|
{
|
||
|
|
Fire(lhs,rhs,Int2Type<SwapArgs>());
|
||
|
|
}
|
||
|
|
};
|
||
|
|
public:
|
||
|
|
typedef In<ResultType> Base;
|
||
|
|
}; // FunctorDispatcherHelperBase
|
||
|
|
|
||
|
|
template <class BaseLhs, class BaseRhs, class SomeLhs, class SomeRhs,
|
||
|
|
typename ResultType, class CastLhs, class CastRhs, class Fun, bool SwapArgs>
|
||
|
|
class FunctorDispatcherHelper : public FunctorDispatcherHelperBase
|
||
|
|
<
|
||
|
|
BaseLhs, BaseRhs, SomeLhs, SomeRhs,
|
||
|
|
ResultType, CastLhs, CastRhs, Fun,
|
||
|
|
SwapArgs
|
||
|
|
>::Base
|
||
|
|
{
|
||
|
|
private:
|
||
|
|
typedef typename FunctorDispatcherHelperBase
|
||
|
|
<
|
||
|
|
BaseLhs, BaseRhs, SomeLhs, SomeRhs,
|
||
|
|
ResultType, CastLhs, CastRhs, Fun, SwapArgs
|
||
|
|
>::Base Base;
|
||
|
|
public:
|
||
|
|
FunctorDispatcherHelper(const Fun& f) : Base(f)
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
|
||
|
|
template <typename ResultType, class BaseLhs, class BaseRhs,
|
||
|
|
class DispatcherBackend>
|
||
|
|
class FunctorDispatcherBase
|
||
|
|
{
|
||
|
|
private:
|
||
|
|
class Common
|
||
|
|
{
|
||
|
|
protected:
|
||
|
|
typedef TYPELIST_2(BaseLhs&, BaseRhs&) ArgsList;
|
||
|
|
typedef Functor<ResultType, ArgsList, DEFAULT_THREADING> FunctorType;
|
||
|
|
|
||
|
|
ApplyInnerType4<DispatcherBackend,BaseLhs, BaseRhs, ResultType,
|
||
|
|
FunctorType>::type backEnd_;
|
||
|
|
~Common() {}
|
||
|
|
};
|
||
|
|
|
||
|
|
template <class R>
|
||
|
|
class In : public Common
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
typedef typename Common::ArgsList ArgsList;
|
||
|
|
typedef typename Common::FunctorType FunctorType;
|
||
|
|
ResultType Go(BaseLhs& lhs, BaseRhs& rhs)
|
||
|
|
{
|
||
|
|
return Common::backEnd_.Go(lhs, rhs);
|
||
|
|
}
|
||
|
|
protected:
|
||
|
|
In() {}
|
||
|
|
};
|
||
|
|
template <>
|
||
|
|
class In<void> : public Common
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
typedef typename Common::ArgsList ArgsList;
|
||
|
|
typedef typename Common::FunctorType FunctorType;
|
||
|
|
ResultType Go(BaseLhs& lhs, BaseRhs& rhs)
|
||
|
|
{
|
||
|
|
Common::backEnd_.Go(lhs, rhs);
|
||
|
|
}
|
||
|
|
protected:
|
||
|
|
In<void>() {}
|
||
|
|
};
|
||
|
|
public:
|
||
|
|
typedef In<ResultType> Base;
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// class template FunctorDispatcher
|
||
|
|
// Implements a logarithmic double dispatcher for functors
|
||
|
|
// Features automated casting
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
template <class BaseLhs, class BaseRhs = BaseLhs,
|
||
|
|
typename ResultType = Loki::Private::VoidWrap::type,
|
||
|
|
class CastingPolicy = DynamicCasterWrapper,
|
||
|
|
class DispatcherBackend = BasicDispatcherWrapper>
|
||
|
|
class FunctorDispatcher : public ::Loki::Private::FunctorDispatcherBase
|
||
|
|
<
|
||
|
|
ResultType, BaseLhs, BaseRhs, DispatcherBackend
|
||
|
|
>::Base
|
||
|
|
{
|
||
|
|
typedef typename ::Loki::Private::FunctorDispatcherBase
|
||
|
|
<
|
||
|
|
ResultType, BaseLhs, BaseRhs, DispatcherBackend
|
||
|
|
>::Base Base;
|
||
|
|
public:
|
||
|
|
typedef Base::ArgsList ArgsList;
|
||
|
|
typedef Base::FunctorType FunctorType;
|
||
|
|
template <class SomeLhs, class SomeRhs, class Fun>
|
||
|
|
void Add(const Fun& fun, ::Loki::Type2Type<SomeLhs>,
|
||
|
|
::Loki::Type2Type<SomeRhs>)
|
||
|
|
{
|
||
|
|
typedef typename ApplyInnerType2<CastingPolicy,SomeLhs, BaseLhs>::type CastOne;
|
||
|
|
typedef typename ApplyInnerType2<CastingPolicy,SomeRhs, BaseRhs>::type CastTwo;
|
||
|
|
typedef typename
|
||
|
|
Private::FunctorDispatcherHelper
|
||
|
|
<
|
||
|
|
BaseLhs, BaseRhs, SomeLhs, SomeRhs,
|
||
|
|
ResultType,CastOne,CastTwo,Fun, false
|
||
|
|
>::Base Adapter;
|
||
|
|
Base::backEnd_.Add(FunctorType(Adapter(fun), Loki::Disambiguate()),
|
||
|
|
Type2Type<SomeLhs>(), Type2Type<SomeRhs>());
|
||
|
|
}
|
||
|
|
template <class SomeLhs, class SomeRhs, class Fun>
|
||
|
|
void Add(const Fun& fun, ::Loki::Type2Type<SomeLhs>,
|
||
|
|
::Loki::Type2Type<SomeRhs>, bool symmetric)
|
||
|
|
{
|
||
|
|
Add(fun, Type2Type<SomeLhs>(), Type2Type<SomeRhs>());
|
||
|
|
|
||
|
|
if (symmetric)
|
||
|
|
{
|
||
|
|
// Note: symmetry only makes sense where BaseLhs==BaseRhs
|
||
|
|
typedef typename ApplyInnerType2<CastingPolicy,SomeLhs, BaseLhs>::type CastOne;
|
||
|
|
typedef typename ApplyInnerType2<CastingPolicy,SomeRhs, BaseLhs>::type CastTwo;
|
||
|
|
typedef typename
|
||
|
|
Private::FunctorDispatcherHelper
|
||
|
|
<
|
||
|
|
BaseLhs, BaseRhs, SomeLhs, SomeRhs,
|
||
|
|
ResultType,CastOne,CastTwo,Fun, true
|
||
|
|
>::Base AdapterR;
|
||
|
|
|
||
|
|
Base::backEnd_.Add(FunctorType(AdapterR(fun), Loki::Disambiguate()),
|
||
|
|
Type2Type<SomeRhs>(), Type2Type<SomeLhs>());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class SomeLhs, class SomeRhs>
|
||
|
|
void Remove(::Loki::Type2Type<SomeLhs>, ::Loki::Type2Type<SomeRhs>)
|
||
|
|
{
|
||
|
|
Base::backEnd_.Remove(Type2Type<SomeLhs>(), Type2Type<SomeRhs>());
|
||
|
|
}
|
||
|
|
|
||
|
|
// moved to base class
|
||
|
|
// ResultType Go(BaseLhs& lhs, BaseRhs& rhs);
|
||
|
|
|
||
|
|
};
|
||
|
|
} // namespace Loki
|
||
|
|
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// Change log:
|
||
|
|
// June 20, 2001: ported by Nick Thurn to gcc 2.95.3. Kudos, Nick!!!
|
||
|
|
// May 10, 2002: ported by Rani Sharoni to VC7 (RTM - 9466)
|
||
|
|
// Oct 28, 2002: ported by Benjamin Kaufmann to MSVC 6
|
||
|
|
// Feb 19, 2003: replaced pointer-Dummies with Type2Type-Parameters and added
|
||
|
|
// support for return type void. B.K.
|
||
|
|
// Mar 06, 2003: Changed default values for return types to void.
|
||
|
|
// Added protected destructors to private implementation classes B.K.
|
||
|
|
// Mar 20. 2003: Fixed Bugs in FnDispatcherHelperBase, FnDispatcher::Add and
|
||
|
|
// FunctorDispatcher::Add.
|
||
|
|
// New Interface for FnDispatcher::Add.B.K.
|
||
|
|
// Mar 21, 2003: Added new explicit template argument specification workaround
|
||
|
|
// for FnDispatcher::Add B.K.
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
#endif
|