115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
/* Type traits for OctaSTD.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OCTA_TRAITS_H
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#define OCTA_TRAITS_H
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#include "octa/types.h"
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namespace octa {
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/* conditional */
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template<bool cond, typename T, typename U>
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struct Conditional {
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typedef T type;
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};
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template<typename T, typename U>
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struct Conditional<false, T, U> {
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typedef U type;
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};
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/* removers */
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template<typename T> struct RemoveReference { typedef T type; };
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template<typename T> struct RemoveReference<T&> { typedef T type; };
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template<typename T> struct RemoveReference<T&&> { typedef T type; };
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template<typename T> struct RemoveConst { typedef T type; };
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template<typename T> struct RemoveConst<const T> { typedef T type; };
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template<typename T> struct RemoveVolatile { typedef T type; };
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template<typename T> struct RemoveVolatile<volatile T> { typedef T type; };
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template<typename T>
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struct RemoveConstVolatile {
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typedef typename RemoveVolatile<typename RemoveConst<T>::type>::type type;
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};
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/* integral constant */
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template<typename T, T val>
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struct IntegralConstant {
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static const T value = val;
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typedef T value_type;
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typedef IntegralConstant<T, v> type;
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};
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typedef IntegralConstant<bool, true> true_t;
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typedef IntegralConstant<bool, false> false_t;
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template<typename T, T val> const T IntegralConstant<T, val>::value;
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/* is integer */
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template<typename T> struct IsIntegerBase: false_t {};
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template<> struct IsIntegerBase<bool >: true_t {};
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template<> struct IsIntegerBase<char >: true_t {};
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template<> struct IsIntegerBase<uchar >: true_t {};
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template<> struct IsIntegerBase<schar >: true_t {};
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template<> struct IsIntegerBase<short >: true_t {};
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template<> struct IsIntegerBase<ushort>: true_t {};
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template<> struct IsIntegerBase<int >: true_t {};
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template<> struct IsIntegerBase<uint >: true_t {};
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template<> struct IsIntegerBase<long >: true_t {};
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template<> struct IsIntegerBase<ulong >: true_t {};
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template<> struct IsIntegerBase<llong >: true_t {};
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template<> struct IsIntegerBase<ullong>: true_t {};
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template<typename T>
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struct IsInteger: IsIntegerBase<typename RemoveConstVolatile<T>::type> {};
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/* is floating point */
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template<typename T> struct IsFloatBase : false_t {};
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template<> struct IsFloatBase<float>: true_t {};
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template<> struct IsFloatBase<double>: true_t {};
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template<> struct IsFloatBase<ldouble>: true_t {};
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template<typename T>
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struct IsFloat: IsFloatBase<typename RemoveConstVolatile<T>::type> {};
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/* is pointer */
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template<typename T> struct IsPointerBase: false_t {};
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template<> struct IsPointerBase<T *>: true_t {};
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template<typename T>
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struct IsPointer: IsPointerBase<typename RemoveConstVolatile<T>::type> {};
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/* is POD: currently wrong */
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template<typename T> struct IsPOD: IntegralConstant<bool,
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(IsInteger<T>::value || IsFloat<T>::value || IsPointer<T>::value)
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> {};
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/* type equality */
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template<typename, typename>
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struct IsEqual {
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static const bool value = false;
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};
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template<typename T>
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struct IsEqual<T, T> {
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static const bool value = true;
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};
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}
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#endif |