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履歴 編集

function
<system_error>

std::operator==(C++11)

namespace std {
  bool operator==(const error_code& lhs, const error_code& rhs) noexcept;           // (1)
  bool operator==(const error_code& lhs, const error_condition& rhs) noexcept;      // (2)
  bool operator==(const error_condition& lhs, const error_code& rhs) noexcept;      // (3)
  bool operator==(const error_condition& lhs, const error_condition& rhs) noexcept; // (4)
}

概要

error_code, error_conditionの等値比較を行う

戻り値

例外

投げない

#include <iostream>
#include <system_error>

int main()
{
  std::error_code ec1 = std::make_error_code(std::errc::invalid_argument);
  std::error_code ec2 = std::make_error_code(std::errc::permission_denied);
  std::error_condition ed1 = std::make_error_condition(std::errc::invalid_argument);
  std::error_condition ed2 = std::make_error_condition(std::errc::permission_denied);

  std::cout << std::boolalpha;

  std::cout << "error_code == error_code : " << (ec1 == ec1) << std::endl;
  std::cout << "error_code == error_code : " << (ec1 == ec2) << std::endl;

  std::cout << "error_code == error_condition : " << (ec1 == ed1) << std::endl;
  std::cout << "error_code == error_condition : " << (ec1 == ed2) << std::endl;

  std::cout << "error_condition == error_condition : " << (ed1 == ed1) << std::endl;
  std::cout << "error_condition == error_condition : " << (ed1 == ed2) << std::endl;

}

出力

error_code == error_code : true
error_code == error_code : false
error_code == error_condition : true
error_code == error_condition : false
error_condition == error_condition : true
error_condition == error_condition : false

バージョン

言語

  • C++11

処理系

参照