forked from OctaForge/libostd
443 lines
14 KiB
C++
443 lines
14 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 <stddef.h>
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#include "octa/types.h"
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#include "octa/utility.h"
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/* libc++ and cppreference.com occasionally used for reference */
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/* missing:
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*
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* UnderlyingType<T>
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*/
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namespace octa {
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/* removers */
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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 constexpr const T value = val;
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typedef T value_type;
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typedef IntegralConstant<T, val> type;
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constexpr operator value_type() const { return value; }
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constexpr value_type operator()() const { return value; }
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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> constexpr const T IntegralConstant<T, val>::value;
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/* is void */
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template<typename T> struct IsVoidBase : false_t {};
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template< > struct IsVoidBase<void>: true_t {};
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template<typename T>
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struct IsVoid: IsVoidBase<typename RemoveConstVolatile<T>::type> {};
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/* is null pointer */
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template<typename> struct IsNullPointerBase : false_t {};
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template< > struct IsNullPointerBase<nullptr_t>: true_t {};
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template<typename T>
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struct IsNullPointer: IsNullPointerBase<
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typename RemoveConstVolatile<T>::type
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> {};
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/* is integer */
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template<typename T> struct IsIntegralBase: false_t {};
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template<> struct IsIntegralBase<bool >: true_t {};
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template<> struct IsIntegralBase<char >: true_t {};
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template<> struct IsIntegralBase<uchar >: true_t {};
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template<> struct IsIntegralBase<schar >: true_t {};
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template<> struct IsIntegralBase<short >: true_t {};
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template<> struct IsIntegralBase<ushort>: true_t {};
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template<> struct IsIntegralBase<int >: true_t {};
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template<> struct IsIntegralBase<uint >: true_t {};
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template<> struct IsIntegralBase<long >: true_t {};
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template<> struct IsIntegralBase<ulong >: true_t {};
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template<> struct IsIntegralBase<llong >: true_t {};
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template<> struct IsIntegralBase<ullong>: true_t {};
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template<typename T>
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struct IsIntegral: IsIntegralBase<typename RemoveConstVolatile<T>::type> {};
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/* is floating point */
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template<typename T> struct IsFloatingPointBase : false_t {};
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template<> struct IsFloatingPointBase<float >: true_t {};
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template<> struct IsFloatingPointBase<double >: true_t {};
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template<> struct IsFloatingPointBase<ldouble>: true_t {};
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template<typename T>
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struct IsFloatingPoint: IsFloatingPointBase<typename RemoveConstVolatile<T>::type> {};
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/* is array */
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template<typename > struct IsArray : false_t {};
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template<typename T > struct IsArray<T[] >: true_t {};
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template<typename T, size_t N> struct IsArray<T[N]>: true_t {};
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/* is pointer */
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template<typename > struct IsPointerBase : false_t {};
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template<typename T> 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 lvalue reference */
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template<typename > struct IsLvalueReference : false_t {};
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template<typename T> struct IsLvalueReference<T &>: true_t {};
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/* is rvalue reference */
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template<typename > struct IsRvalueReference : false_t {};
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template<typename T> struct IsRvalueReference<T &&>: true_t {};
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/* is enum */
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template<typename T> struct IsEnum: IntegralConstant<bool, __is_enum(T)> {};
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/* is union */
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template<typename T> struct IsUnion: IntegralConstant<bool, __is_union(T)> {};
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/* is class */
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template<typename T> struct IsClass: IntegralConstant<bool, __is_class(T)> {};
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/* is function */
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template<typename> struct IsReference;
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namespace internal {
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struct FunctionTestDummy {};
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template<typename T> char function_test(T *);
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template<typename T> char function_test(FunctionTestDummy);
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template<typename T> int function_test(...);
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template<typename T> T &function_source(int);
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template<typename T> FunctionTestDummy function_source(...);
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}
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template<typename T, bool = IsClass<T>::value || IsUnion<T>::value
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|| IsVoid<T>::value || IsReference<T>::value
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|| IsNullPointer<T>::value
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> struct IsFunctionBase: IntegralConstant<bool,
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sizeof(internal::function_test<T>(internal::function_source<T>(0))) == 1
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> {};
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template<typename T> struct IsFunctionBase<T, true>: false_t {};
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template<typename T> struct IsFunction: IsFunctionBase<T> {};
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/* is arithmetic */
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template<typename T> struct IsArithmetic: IntegralConstant<bool,
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(IsIntegral<T>::value || IsFloatingPoint<T>::value)
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> {};
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/* is fundamental */
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template<typename T> struct IsFundamental: IntegralConstant<bool,
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(IsArithmetic<T>::value || IsVoid<T>::value || IsNullPointer<T>::value)
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> {};
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/* is compound */
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template<typename T> struct IsCompound: IntegralConstant<bool,
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!IsFundamental<T>::value
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> {};
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/* is pointer to member function */
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template<typename> struct IsMemberFunctionPointer: true_t {};
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/* is pointer to member */
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template<typename> struct IsMemberPointerBase: false_t {};
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template<typename T, typename U>
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struct IsMemberPointerBase<T U::*>: true_t {};
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template<typename T>
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struct IsMemberPointer: IsMemberPointerBase<
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typename RemoveConstVolatile<T>::type
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> {};
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/* is pointer to member object */
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template<typename T> struct IsMemberObjectPointer: IntegralConstant<bool,
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(IsMemberPointer<T>::value && !IsMemberFunctionPointer<T>::value)
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> {};
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/* is reference */
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template<typename T> struct IsReference: IntegralConstant<bool,
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(IsLvalueReference<T>::value || IsRvalueReference<T>::value)
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> {};
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/* is object */
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template<typename T> struct IsObject: IntegralConstant<bool,
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(!IsFunction<T>::value && !IsVoid<T>::value && !IsReference<T>::value)
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> {};
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/* is scalar */
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template<typename T> struct IsScalar: IntegralConstant<bool,
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(IsMemberPointer<T>::value || IsPointer<T>::value || IsEnum<T>::value
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|| IsNullPointer <T>::value || IsArithmetic<T>::value)
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> {};
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/* is abstract */
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template<typename T>
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struct IsAbstract: IntegralConstant<bool, __is_abstract(T)> {};
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/* is const */
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template<typename > struct IsConst : false_t {};
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template<typename T> struct IsConst<const T>: true_t {};
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/* is volatile */
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template<typename > struct IsVolatile : false_t {};
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template<typename T> struct IsVolatile<volatile T>: true_t {};
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/* is empty */
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template<typename T> struct IsEmpty: IntegralConstant<bool, __is_empty(T)> {};
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/* is POD */
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template<typename T> struct IsPOD: IntegralConstant<bool, __is_pod(T)> {};
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/* is polymorphic */
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template<typename T>
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struct IsPolymorphic: IntegralConstant<bool, __is_polymorphic(T)> {};
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/* is signed */
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template<typename T> struct IsSigned: IntegralConstant<bool, T(-1) < T(0)> {};
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/* is unsigned */
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template<typename T> struct IsUnsigned: IntegralConstant<bool, T(0) < T(-1)> {};
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/* is standard layout */
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template<typename T> struct RemoveAllExtents;
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template<typename T> struct IsStandardLayout: IntegralConstant<bool,
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IsScalar<typename RemoveAllExtents<T>::type>::value
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> {};
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/* is literal type */
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template<typename T>
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struct IsLiteralType: IntegralConstant<bool,
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IsReference<typename RemoveAllExtents<T>::type>::value
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|| IsStandardLayout<T>::value
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> {};
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/* is base of */
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template<typename B, typename D>
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struct IsBaseOf: IntegralConstant<bool, __is_base_of(B, D)> {};
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/* type equality */
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template<typename, typename> struct IsSame : false_t {};
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template<typename T > struct IsSame<T, T>: true_t {};
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/* extent */
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template<typename T, unsigned I = 0>
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struct Extent: IntegralConstant<size_t, 0> {};
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template<typename T>
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struct Extent<T[], 0>: IntegralConstant<size_t, 0> {};
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template<typename T, unsigned I>
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struct Extent<T[], I>: IntegralConstant<size_t, Extent<T, I - 1>::value> {};
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template<typename T, size_t N>
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struct Extent<T[N], 0>: IntegralConstant<size_t, N> {};
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template<typename T, size_t N, unsigned I>
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struct Extent<T[N], I>: IntegralConstant<size_t, Extent<T, I - 1>::value> {};
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/* rank */
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template<typename T> struct Rank: IntegralConstant<size_t, 0> {};
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template<typename T>
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struct Rank<T[]>: IntegralConstant<size_t, Rank<T>::value + 1> {};
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template<typename T, size_t N>
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struct Rank<T[N]>: IntegralConstant<size_t, Rank<T>::value + 1> {};
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/* remove reference */
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template<typename T> using RemoveReference = internal::RemoveReference<T>;
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/* remove pointer */
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template<typename T> struct RemovePointer { typedef T type; };
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template<typename T> struct RemovePointer<T * > { typedef T type; };
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template<typename T> struct RemovePointer<T * const > { typedef T type; };
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template<typename T> struct RemovePointer<T * volatile > { typedef T type; };
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template<typename T> struct RemovePointer<T * const volatile> { typedef T type; };
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/* add pointer */
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template<typename T> struct AddPointer {
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typedef typename RemoveReference<T>::type *type;
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};
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/* add lvalue reference */
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template<typename T> struct AddLvalueReference { typedef T &type; };
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template<typename T> struct AddLvalueReference<T &> { typedef T &type; };
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template<typename T> struct AddLvalueReference<T &&> { typedef T &type; };
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template<> struct AddLvalueReference<void> {
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typedef void type;
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};
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template<> struct AddLvalueReference<const void> {
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typedef const void type;
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};
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template<> struct AddLvalueReference<volatile void> {
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typedef volatile void type;
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};
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template<> struct AddLvalueReference<const volatile void> {
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typedef const volatile void type;
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};
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/* add rvalue reference */
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template<typename T> using AddRvalueReference = internal::AddRvalueReference<T>;
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/* remove extent */
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template<typename T > struct RemoveExtent { typedef T type; };
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template<typename T > struct RemoveExtent<T[ ]> { typedef T type; };
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template<typename T, size_t N> struct RemoveExtent<T[N]> { typedef T type; };
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/* remove all extents */
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template<typename T> struct RemoveAllExtents { typedef T type; };
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template<typename T> struct RemoveAllExtents<T[]> {
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typedef typename RemoveAllExtents<T>::type type;
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};
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template<typename T, size_t N> struct RemoveAllExtents<T[N]> {
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typedef typename RemoveAllExtents<T>::type type;
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};
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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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/* result of call at compile time */
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namespace internal {
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template<typename F, typename ...A>
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inline auto result_of_invoke(F &&f, A &&...args) ->
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decltype(forward<F>(f)(forward<A>(args)...)) {
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return forward<F>(f)(forward<A>(args)...);
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}
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template<typename B, typename T, typename D>
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inline auto result_of_invoke(T B::*pmd, D &&ref) ->
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decltype(forward<D>(ref).*pmd) {
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return forward<D>(ref).*pmd;
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}
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template<typename PMD, typename P>
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inline auto result_of_invoke(PMD &&pmd, P &&ptr) ->
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decltype((*forward<P>(ptr)).*forward<PMD>(pmd)) {
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return (*forward<P>(ptr)).*forward<PMD>(pmd);
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}
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template<typename B, typename T, typename D, typename ...A>
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inline auto result_of_invoke(T B::*pmf, D &&ref, A &&...args) ->
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decltype((forward<D>(ref).*pmf)(forward<A>(args)...)) {
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return (forward<D>(ref).*pmf)(forward<A>(args)...);
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}
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template<typename PMF, typename P, typename ...A>
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inline auto result_of_invoke(PMF &&pmf, P &&ptr, A &&...args) ->
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decltype(((*forward<P>(ptr)).*forward<PMF>(pmf))(forward<A>(args)...)) {
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return ((*forward<P>(ptr)).*forward<PMF>(pmf))(forward<A>(args)...);
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}
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template<typename, typename = void>
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struct ResultOf {};
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template<typename F, typename ...A>
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struct ResultOf<F(A...), decltype(void(result_of_invoke(declval<F>(),
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declval<A>()...)))> {
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using type = decltype(result_of_invoke(declval<F>(), declval<A>()...));
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};
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}
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template<typename T> struct ResultOf: internal::ResultOf<T> {};
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/* enable_if */
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template<bool B, typename T = void> struct enable_if {};
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template<typename T> struct enable_if<true, T> { typedef T type; };
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/* decay */
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template<typename T>
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struct Decay {
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private:
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typedef typename RemoveReference<T>::type U;
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public:
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typedef typename Conditional<IsArray<U>::value,
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typename RemoveExtent<U>::type *,
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typename Conditional<IsFunction<U>::value,
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typename AddPointer<U>::type,
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typename RemoveConstVolatile<U>::type
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>::type
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>::type type;
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};
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}
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#endif |