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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___CXX03___FUNCTIONAL_BIND_H |
| 11 | #define _LIBCPP___CXX03___FUNCTIONAL_BIND_H |
| 12 | |
| 13 | #include <__cxx03/__config> |
| 14 | #include <__cxx03/__functional/weak_result_type.h> |
| 15 | #include <__cxx03/__fwd/functional.h> |
| 16 | #include <__cxx03/__type_traits/decay.h> |
| 17 | #include <__cxx03/__type_traits/invoke.h> |
| 18 | #include <__cxx03/__type_traits/is_reference_wrapper.h> |
| 19 | #include <__cxx03/__type_traits/is_void.h> |
| 20 | #include <__cxx03/__type_traits/remove_cvref.h> |
| 21 | #include <__cxx03/cstddef> |
| 22 | |
| 23 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 24 | # pragma GCC system_header |
| 25 | #endif |
| 26 | |
| 27 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 28 | |
| 29 | template <class _Tp> |
| 30 | struct is_bind_expression |
| 31 | : _If< _IsSame<_Tp, __remove_cvref_t<_Tp> >::value, false_type, is_bind_expression<__remove_cvref_t<_Tp> > > {}; |
| 32 | |
| 33 | template <class _Tp> |
| 34 | struct is_placeholder |
| 35 | : _If< _IsSame<_Tp, __remove_cvref_t<_Tp> >::value, |
| 36 | integral_constant<int, 0>, |
| 37 | is_placeholder<__remove_cvref_t<_Tp> > > {}; |
| 38 | |
| 39 | namespace placeholders { |
| 40 | |
| 41 | template <int _Np> |
| 42 | struct __ph {}; |
| 43 | |
| 44 | // C++17 recommends that we implement placeholders as `inline constexpr`, but allows |
| 45 | // implementing them as `extern <implementation-defined>`. Libc++ implements them as |
| 46 | // `extern const` in all standard modes to avoid an ABI break in C++03: making them |
| 47 | // `inline constexpr` requires removing their definition in the shared library to |
| 48 | // avoid ODR violations, which is an ABI break. |
| 49 | // |
| 50 | // In practice, since placeholders are empty, `extern const` is almost impossible |
| 51 | // to distinguish from `inline constexpr` from a usage stand point. |
| 52 | _LIBCPP_EXPORTED_FROM_ABI extern const __ph<1> _1; |
| 53 | _LIBCPP_EXPORTED_FROM_ABI extern const __ph<2> _2; |
| 54 | _LIBCPP_EXPORTED_FROM_ABI extern const __ph<3> _3; |
| 55 | _LIBCPP_EXPORTED_FROM_ABI extern const __ph<4> _4; |
| 56 | _LIBCPP_EXPORTED_FROM_ABI extern const __ph<5> _5; |
| 57 | _LIBCPP_EXPORTED_FROM_ABI extern const __ph<6> _6; |
| 58 | _LIBCPP_EXPORTED_FROM_ABI extern const __ph<7> _7; |
| 59 | _LIBCPP_EXPORTED_FROM_ABI extern const __ph<8> _8; |
| 60 | _LIBCPP_EXPORTED_FROM_ABI extern const __ph<9> _9; |
| 61 | _LIBCPP_EXPORTED_FROM_ABI extern const __ph<10> _10; |
| 62 | |
| 63 | } // namespace placeholders |
| 64 | |
| 65 | template <int _Np> |
| 66 | struct is_placeholder<placeholders::__ph<_Np> > : public integral_constant<int, _Np> {}; |
| 67 | |
| 68 | _LIBCPP_END_NAMESPACE_STD |
| 69 | |
| 70 | #endif // _LIBCPP___CXX03___FUNCTIONAL_BIND_H |
| 71 |
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