libcxx/include/__functional/binder1st.h

   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___FUNCTIONAL_BINDER1ST_H
  11 #define _LIBCPP___FUNCTIONAL_BINDER1ST_H
  12
  13 #include <__config>
  14 #include <__functional/unary_function.h>
  15
  16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  17 #  pragma GCC system_header
  18 #endif
  19
  20 _LIBCPP_BEGIN_NAMESPACE_STD
  21
  22 #if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_BINDERS)
  23
  24 template <class _Operation>
  25 class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX11 binder1st
  26     : public __unary_function<typename _Operation::second_argument_type, typename _Operation::result_type> {
  27 protected:
  28   _Operation op;
  29   typename _Operation::first_argument_type value;
  30
  31 public:
  32   _LIBCPP_HIDE_FROM_ABI binder1st(const _Operation& __x, const typename _Operation::first_argument_type __y)
  33       : op(__x), value(__y) {}
  34   _LIBCPP_HIDE_FROM_ABI typename _Operation::result_type
  35   operator()(typename _Operation::second_argument_type& __x) const {
  36     return op(value, __x);
  37   }
  38   _LIBCPP_HIDE_FROM_ABI typename _Operation::result_type
  39   operator()(const typename _Operation::second_argument_type& __x) const {
  40     return op(value, __x);
  41   }
  42 };
  43
  44 template <class _Operation, class _Tp>
  45 _LIBCPP_DEPRECATED_IN_CXX11 inline _LIBCPP_HIDE_FROM_ABI binder1st<_Operation>
  46 bind1st(const _Operation& __op, const _Tp& __x) {
  47   return binder1st<_Operation>(__op, __x);
  48 }
  49
  50 #endif // _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_BINDERS)
  51
  52 _LIBCPP_END_NAMESPACE_STD
  53
  54 #endif // _LIBCPP___FUNCTIONAL_BINDER1ST_H