derek.holloway
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71 lines
2.6 KiB
C++
71 lines
2.6 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___CXX03___FUNCTIONAL_BIND_H
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#define _LIBCPP___CXX03___FUNCTIONAL_BIND_H
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#include <__cxx03/__config>
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#include <__cxx03/__functional/weak_result_type.h>
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#include <__cxx03/__fwd/functional.h>
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#include <__cxx03/__type_traits/decay.h>
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#include <__cxx03/__type_traits/invoke.h>
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#include <__cxx03/__type_traits/is_reference_wrapper.h>
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#include <__cxx03/__type_traits/is_void.h>
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#include <__cxx03/__type_traits/remove_cvref.h>
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#include <__cxx03/cstddef>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Tp>
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struct is_bind_expression
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: _If< _IsSame<_Tp, __remove_cvref_t<_Tp> >::value, false_type, is_bind_expression<__remove_cvref_t<_Tp> > > {};
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template <class _Tp>
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struct is_placeholder
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: _If< _IsSame<_Tp, __remove_cvref_t<_Tp> >::value,
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integral_constant<int, 0>,
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is_placeholder<__remove_cvref_t<_Tp> > > {};
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namespace placeholders {
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template <int _Np>
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struct __ph {};
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// C++17 recommends that we implement placeholders as `inline constexpr`, but allows
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// implementing them as `extern <implementation-defined>`. Libc++ implements them as
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// `extern const` in all standard modes to avoid an ABI break in C++03: making them
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// `inline constexpr` requires removing their definition in the shared library to
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// avoid ODR violations, which is an ABI break.
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//
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// In practice, since placeholders are empty, `extern const` is almost impossible
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// to distinguish from `inline constexpr` from a usage stand point.
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_LIBCPP_EXPORTED_FROM_ABI extern const __ph<1> _1;
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_LIBCPP_EXPORTED_FROM_ABI extern const __ph<2> _2;
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_LIBCPP_EXPORTED_FROM_ABI extern const __ph<3> _3;
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_LIBCPP_EXPORTED_FROM_ABI extern const __ph<4> _4;
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_LIBCPP_EXPORTED_FROM_ABI extern const __ph<5> _5;
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_LIBCPP_EXPORTED_FROM_ABI extern const __ph<6> _6;
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_LIBCPP_EXPORTED_FROM_ABI extern const __ph<7> _7;
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_LIBCPP_EXPORTED_FROM_ABI extern const __ph<8> _8;
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_LIBCPP_EXPORTED_FROM_ABI extern const __ph<9> _9;
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_LIBCPP_EXPORTED_FROM_ABI extern const __ph<10> _10;
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} // namespace placeholders
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template <int _Np>
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struct is_placeholder<placeholders::__ph<_Np> > : public integral_constant<int, _Np> {};
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___CXX03___FUNCTIONAL_BIND_H
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