equal.md

#operator==

namespace std {
  bool operator==(const error_code& lhs, const error_code& rhs) noexcept;
  bool operator==(const error_code& lhs, const error_condition& rhs) noexcept;
  bool operator==(const error_condition& lhs, const error_code& rhs) noexcept;
  bool operator==(const error_condition& lhs, const error_condition& rhs) noexcept;
}

• error_code[link /reference/system_error/error_code.md]
• error_condition[link /reference/system_error/error_condition.md]

##概要 error_code, error_conditionの等値比較を行う

##要件

• error_code == error_code
lhs.category() == rhs.{category()](./error_code/category.md) && lhs.[value()](./error_code/value.md) == rhs.[value()`
• error_code == error_condition
lhs.category().equivalent(lhs.value(), rhs) || rhs.category().equivalent(lhs, rhs.value())
• error_condition == error_code
rhs.category().equivalent(rhs.value(), lhs) || lhs.category().equivalent(rhs, lhs.value())
• error_condition == error_condition
lhs.category() == rhs.category() && lhs.value() == rhs.value()

##例外 投げない

##例

#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

• Clang: ??
• GCC:
• GCC, C++0x mode: 4.7.0
• ICC: ??
• Visual C++ 10.0

##参照