op_not_equal.md

operator!=

• utility[meta header]
• std[meta namespace]
• function template[meta id-type]

namespace std {
  template <class T1, class T2>
  bool operator!=(const pair<T1, T2>& x, const pair<T1, T2>& y);           // C++03

  template <class T1, class T2>
  constexpr bool operator!=(const pair<T1, T2>& x, const pair<T1, T2>& y); // C++14
}

概要

2つのpairの非等値比較を行う

戻り値

!(x == y)

例

#include <iostream>
#include <utility>
#include <string>

int main()
{
  std::pair<int, std::string> p1(1, "aaa");
  std::pair<int, std::string> p2(1, "aaa");
  std::pair<int, std::string> p3(2, "bbb");

  std::cout << std::boolalpha;
  std::cout << (p1 != p2) << std::endl;
  std::cout << (p1 != p3) << std::endl;
}

出力

false
true

参照

• N3471 Constexpr Library Additions: utilities, v3