| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___TYPE_TRAITS_PROMOTE_H |
| #define _LIBCPP___TYPE_TRAITS_PROMOTE_H |
| |
| #include <__config> |
| #include <__type_traits/integral_constant.h> |
| #include <__type_traits/is_same.h> |
| #include <__utility/declval.h> |
| #include <cstddef> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <class _Tp> |
| struct __numeric_type |
| { |
| static void __test(...); |
| static float __test(float); |
| static double __test(char); |
| static double __test(int); |
| static double __test(unsigned); |
| static double __test(long); |
| static double __test(unsigned long); |
| static double __test(long long); |
| static double __test(unsigned long long); |
| #ifndef _LIBCPP_HAS_NO_INT128 |
| static double __test(__int128_t); |
| static double __test(__uint128_t); |
| #endif |
| static double __test(double); |
| static long double __test(long double); |
| |
| typedef decltype(__test(std::declval<_Tp>())) type; |
| static const bool value = _IsNotSame<type, void>::value; |
| }; |
| |
| template <> |
| struct __numeric_type<void> |
| { |
| static const bool value = true; |
| }; |
| |
| template <class _A1, class _A2 = void, class _A3 = void, |
| bool = __numeric_type<_A1>::value && |
| __numeric_type<_A2>::value && |
| __numeric_type<_A3>::value> |
| class __promote_imp |
| { |
| public: |
| static const bool value = false; |
| }; |
| |
| template <class _A1, class _A2, class _A3> |
| class __promote_imp<_A1, _A2, _A3, true> |
| { |
| private: |
| typedef typename __promote_imp<_A1>::type __type1; |
| typedef typename __promote_imp<_A2>::type __type2; |
| typedef typename __promote_imp<_A3>::type __type3; |
| public: |
| typedef decltype(__type1() + __type2() + __type3()) type; |
| static const bool value = true; |
| }; |
| |
| template <class _A1, class _A2> |
| class __promote_imp<_A1, _A2, void, true> |
| { |
| private: |
| typedef typename __promote_imp<_A1>::type __type1; |
| typedef typename __promote_imp<_A2>::type __type2; |
| public: |
| typedef decltype(__type1() + __type2()) type; |
| static const bool value = true; |
| }; |
| |
| template <class _A1> |
| class __promote_imp<_A1, void, void, true> |
| { |
| public: |
| typedef typename __numeric_type<_A1>::type type; |
| static const bool value = true; |
| }; |
| |
| template <class _A1, class _A2 = void, class _A3 = void> |
| class __promote : public __promote_imp<_A1, _A2, _A3> {}; |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___TYPE_TRAITS_PROMOTE_H |