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最新推荐文章于 2025-05-29 21:02:03 发布

Nebula-monarch

最新推荐文章于 2025-05-29 21:02:03 发布

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文章标签： java 数据库 c++ 编辑器开发语言

本文链接：https://blog.youkuaiyun.com/Nebula_monarch/article/details/126085375

这个文件包含C++库内部使用的默认谓词，主要用于比较和等价测试。提供了如_Iter_less_iter、_Iter_equal_to_iter等结构，用于迭代器间的比较和等于判断。这些操作符模板适用于不同类型的迭代器。

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// Default predicates for internal use -*- C++ -*-

// Copyright (C) 2013-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file predefined_ops.h
*  This is an internal header file, included by other library headers.
*  You should not attempt to use it directly. @headername{algorithm}
*/

#ifndef _GLIBCXX_PREDEFINED_OPS_H
#define _GLIBCXX_PREDEFINED_OPS_H    1

#include <bits/move.h>

namespace __gnu_cxx
{
namespace __ops
{
  struct _Iter_less_iter
  {
    template<typename _Iterator1, typename _Iterator2>
      _GLIBCXX14_CONSTEXPR
      bool
      operator()(_Iterator1 __it1, _Iterator2 __it2) const
      { return *__it1 < *__it2; }
  };

  _GLIBCXX14_CONSTEXPR
  inline _Iter_less_iter
  __iter_less_iter()
  { return _Iter_less_iter(); }

  struct _Iter_less_val
  {
#if __cplusplus >= 201103L
    constexpr _Iter_less_val() = default;
#else
    _Iter_less_val() { }
#endif

    _GLIBCXX20_CONSTEXPR
    explicit
    _Iter_less_val(_Iter_less_iter) { }

    template<typename _Iterator, typename _Value>
      _GLIBCXX20_CONSTEXPR
      bool
      operator()(_Iterator __it, _Value& __val) const
      { return *__it < __val; }
  };

  _GLIBCXX20_CONSTEXPR
  inline _Iter_less_val
  __iter_less_val()
  { return&nb