| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // 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_IS_SPECIALIZATION |
| #define _LIBCPP___TYPE_TRAITS_IS_SPECIALIZATION |
| |
| // This contains parts of P2098R1 but is based on MSVC STL's implementation. |
| // |
| // The paper has been rejected |
| // We will not pursue P2098R0 (std::is_specialization_of) at this time; we'd |
| // like to see a solution to this problem, but it requires language evolution |
| // too. |
| // |
| // Since it is expected a real solution will be provided in the future only the |
| // minimal part is implemented. |
| // |
| // Note a cvref qualified _Tp is never considered a specialization. |
| |
| #include <__config> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER >= 17 |
| |
| template <class _Tp, template <class...> class _Template> |
| inline constexpr bool __is_specialization_v = false; // true if and only if _Tp is a specialization of _Template |
| |
| template <template <class...> class _Template, class... _Args> |
| inline constexpr bool __is_specialization_v<_Template<_Args...>, _Template> = true; |
| |
| #endif // _LIBCPP_STD_VER >= 17 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___TYPE_TRAITS_IS_SPECIALIZATION |
