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| 1 | // -*- C++ -*- |
|---|---|
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP___TYPE_TRAITS_IS_SPECIALIZATION |
| 11 | #define _LIBCPP___TYPE_TRAITS_IS_SPECIALIZATION |
| 12 | |
| 13 | // This contains parts of P2098R1 but is based on MSVC STL's implementation. |
| 14 | // |
| 15 | // The paper has been rejected |
| 16 | // We will not pursue P2098R0 (std::is_specialization_of) at this time; we'd |
| 17 | // like to see a solution to this problem, but it requires language evolution |
| 18 | // too. |
| 19 | // |
| 20 | // Since it is expected a real solution will be provided in the future only the |
| 21 | // minimal part is implemented. |
| 22 | // |
| 23 | // Note a cvref qualified _Tp is never considered a specialization. |
| 24 | |
| 25 | #include <__config> |
| 26 | |
| 27 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 28 | # pragma GCC system_header |
| 29 | #endif |
| 30 | |
| 31 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 32 | |
| 33 | #if _LIBCPP_STD_VER >= 17 |
| 34 | |
| 35 | template <class _Tp, template <class...> class _Template> |
| 36 | inline constexpr bool __is_specialization_v = false; // true if and only if _Tp is a specialization of _Template |
| 37 | |
| 38 | template <template <class...> class _Template, class... _Args> |
| 39 | inline constexpr bool __is_specialization_v<_Template<_Args...>, _Template> = true; |
| 40 | |
| 41 | #endif // _LIBCPP_STD_VER >= 17 |
| 42 | |
| 43 | _LIBCPP_END_NAMESPACE_STD |
| 44 | |
| 45 | #endif // _LIBCPP___TYPE_TRAITS_IS_SPECIALIZATION |
| 46 |
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