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 {
  28 protected:
  29     _Operation                               op;
  30     typename _Operation::first_argument_type value;
  31 public:
  32     _LIBCPP_INLINE_VISIBILITY binder1st(const _Operation& __x,
  33                                const typename _Operation::first_argument_type __y)
  34         : op(__x), value(__y) {}
  35     _LIBCPP_INLINE_VISIBILITY typename _Operation::result_type operator()
  36         (typename _Operation::second_argument_type& __x) const
  37             {return op(value, __x);}
  38     _LIBCPP_INLINE_VISIBILITY typename _Operation::result_type operator()
  39         (const typename _Operation::second_argument_type& __x) const
  40             {return op(value, __x);}
  41 };
  42
  43 template <class _Operation, class _Tp>
  44 _LIBCPP_DEPRECATED_IN_CXX11 inline _LIBCPP_INLINE_VISIBILITY
  45 binder1st<_Operation>
  46 bind1st(const _Operation& __op, const _Tp& __x)
  47     {return binder1st<_Operation>(__op, __x);}
  48
  49 #endif // _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_BINDERS)
  50
  51 _LIBCPP_END_NAMESPACE_STD
  52
  53 #endif // _LIBCPP___FUNCTIONAL_BINDER1ST_H