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git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@6 7ec92016-0320-0410-acc4-a06ded1c099a
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TypeTraits.h
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TypeTraits.h
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#ifndef TYPETRAITS_INC_
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#define TYPETRAITS_INC_
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#include "Typelist.h"
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namespace Loki
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{
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////////////////////////////////////////////////////////////////////////////////
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// class template IsCustomUnsignedInt
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// Offers a means to integrate nonstandard built-in unsigned integral types
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// (such as unsigned __int64 or unsigned long long int) with the TypeTraits
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// class template defined below.
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// Invocation: IsCustomUnsignedInt<T> where T is any type
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// Defines 'value', an enum that is 1 iff T is a custom built-in unsigned
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// integral type
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// Specialize this class template for nonstandard unsigned integral types
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// and define value = 1 in those specializations
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////////////////////////////////////////////////////////////////////////////////
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template <typename T>
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struct IsCustomUnsignedInt
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{
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enum { value = 0 };
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template IsCustomSignedInt
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// Offers a means to integrate nonstandard built-in unsigned integral types
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// (such as unsigned __int64 or unsigned long long int) with the TypeTraits
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// class template defined below.
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// Invocation: IsCustomSignedInt<T> where T is any type
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// Defines 'value', an enum that is 1 iff T is a custom built-in signed
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// integral type
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// Specialize this class template for nonstandard unsigned integral types
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// and define value = 1 in those specializations
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////////////////////////////////////////////////////////////////////////////////
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template <typename T>
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struct IsCustomSignedInt
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{
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enum { value = 0 };
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template IsCustomFloat
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// Offers a means to integrate nonstandard floating point types with the
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// TypeTraits class template defined below.
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// Invocation: IsCustomFloat<T> where T is any type
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// Defines 'value', an enum that is 1 iff T is a custom built-in
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// floating point type
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// Specialize this class template for nonstandard unsigned integral types
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// and define value = 1 in those specializations
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////////////////////////////////////////////////////////////////////////////////
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template <typename T>
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struct IsCustomFloat
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{
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enum { value = 0 };
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};
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////////////////////////////////////////////////////////////////////////////////
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// Helper types for class template TypeTraits defined below
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////////////////////////////////////////////////////////////////////////////////
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namespace Private
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{
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typedef TYPELIST_4(unsigned char, unsigned short int,
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unsigned int, unsigned long int) StdUnsignedInts;
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typedef TYPELIST_4(signed char, short int,
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int, long int) StdSignedInts;
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typedef TYPELIST_3(bool, char, wchar_t) StdOtherInts;
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typedef TYPELIST_3(float, double, long double) StdFloats;
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}
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////////////////////////////////////////////////////////////////////////////////
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// class template TypeTraits
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// Figures out various properties of any given type
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// Invocations (T is a type):
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// a) TypeTraits<T>::isPointer
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// returns (at compile time) true if T is a pointer type
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// b) TypeTraits<T>::PointeeType
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// returns the type to which T points is T is a pointer type, NullType otherwise
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// a) TypeTraits<T>::isReference
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// returns (at compile time) true if T is a reference type
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// b) TypeTraits<T>::ReferredType
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// returns the type to which T refers is T is a reference type, NullType
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// otherwise
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// c) TypeTraits<T>::isMemberPointer
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// returns (at compile time) true if T is a pointer to member type
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// d) TypeTraits<T>::isStdUnsignedInt
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// returns (at compile time) true if T is a standard unsigned integral type
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// e) TypeTraits<T>::isStdSignedInt
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// returns (at compile time) true if T is a standard signed integral type
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// f) TypeTraits<T>::isStdIntegral
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// returns (at compile time) true if T is a standard integral type
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// g) TypeTraits<T>::isStdFloat
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// returns (at compile time) true if T is a standard floating-point type
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// h) TypeTraits<T>::isStdArith
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// returns (at compile time) true if T is a standard arithmetic type
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// i) TypeTraits<T>::isStdFundamental
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// returns (at compile time) true if T is a standard fundamental type
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// j) TypeTraits<T>::isUnsignedInt
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// returns (at compile time) true if T is a unsigned integral type
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// k) TypeTraits<T>::isSignedInt
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// returns (at compile time) true if T is a signed integral type
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// l) TypeTraits<T>::isIntegral
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// returns (at compile time) true if T is a integral type
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// m) TypeTraits<T>::isFloat
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// returns (at compile time) true if T is a floating-point type
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// n) TypeTraits<T>::isArith
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// returns (at compile time) true if T is a arithmetic type
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// o) TypeTraits<T>::isFundamental
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// returns (at compile time) true if T is a fundamental type
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// p) TypeTraits<T>::ParameterType
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// returns the optimal type to be used as a parameter for functions that take Ts
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// q) TypeTraits<T>::isConst
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// returns (at compile time) true if T is a const-qualified type
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// r) TypeTraits<T>::NonConstType
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// removes the 'const' qualifier from T, if any
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// s) TypeTraits<T>::isVolatile
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// returns (at compile time) true if T is a volatile-qualified type
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// t) TypeTraits<T>::NonVolatileType
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// removes the 'volatile' qualifier from T, if any
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// u) TypeTraits<T>::UnqualifiedType
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// removes both the 'const' and 'volatile' qualifiers from T, if any
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////////////////////////////////////////////////////////////////////////////////
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template <typename T>
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class TypeTraits
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{
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private:
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template <class U> struct PointerTraits
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{
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enum { result = false };
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typedef NullType PointeeType;
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};
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template <class U> struct PointerTraits<U*>
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{
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enum { result = true };
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typedef U PointeeType;
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};
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template <class U> struct ReferenceTraits
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{
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enum { result = false };
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typedef U ReferredType;
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};
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template <class U> struct ReferenceTraits<U&>
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{
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enum { result = true };
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typedef U ReferredType;
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};
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template <class U> struct PToMTraits
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{
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enum { result = false };
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};
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template <class U, class V>
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struct PToMTraits<U V::*>
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{
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enum { result = true };
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};
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template <class U> struct UnConst
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{
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typedef U Result;
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enum { isConst = 0 };
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};
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template <class U> struct UnConst<const U>
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{
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typedef U Result;
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enum { isConst = 1 };
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};
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template <class U> struct UnVolatile
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{
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typedef U Result;
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enum { isVolatile = 0 };
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};
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template <class U> struct UnVolatile<volatile U>
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{
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typedef U Result;
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enum { isVolatile = 1 };
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};
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public:
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enum { isPointer = PointerTraits<T>::result };
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typedef PointerTraits<T>::PointeeType PointeeType;
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enum { isReference = ReferenceTraits<T>::result };
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typedef ReferenceTraits<T>::ReferredType ReferredType;
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enum { isMemberPointer = PToMTraits<T>::result };
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enum { isStdUnsignedInt =
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TL::IndexOf<Private::StdUnsignedInts, T>::value >= 0 };
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enum { isStdSignedInt =
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TL::IndexOf<Private::StdSignedInts, T>::value >= 0 };
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enum { isStdIntegral = isStdUnsignedInt || isStdSignedInt ||
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TL::IndexOf<Private::StdOtherInts, T>::value >= 0 };
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enum { isStdFloat = TL::IndexOf<Private::StdFloats, T>::value >= 0 };
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enum { isStdArith = isStdIntegral || isStdFloat };
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enum { isStdFundamental = isStdArith || isStdFloat ||
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Conversion<T, void>::sameType };
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enum { isUnsignedInt = isStdUnsignedInt || IsCustomUnsignedInt<T>::value };
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enum { isSignedInt = isStdSignedInt || IsCustomSignedInt<T>::value };
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enum { isIntegral = isStdIntegral || isUnsignedInt || isSignedInt };
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enum { isFloat = isStdFloat || IsCustomFloat<T>::value };
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enum { isArith = isIntegral || isFloat };
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enum { isFundamental = isStdFundamental || isArith || isFloat };
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typedef Select<isStdArith || isPointer || isMemberPointer,
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T, ReferredType&>::Result
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ParameterType;
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enum { isConst = UnConst<T>::isConst };
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typedef UnConst<T>::Result NonConstType;
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enum { isVolatile = UnVolatile<T>::isVolatile };
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typedef UnVolatile<T>::Result NonVolatileType;
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typedef UnVolatile<UnConst<T>::Result>::Result UnqualifiedType;
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};
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}
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#endif // TYPETRAITS_INC_
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