std::strong_ordering::operator weak_ordering

constexpr operator weak_ordering() const noexcept;

概要

std::weak_ordering型に変換する。

戻り値

以下と等価：

return *this == 0 ? weak_ordering::equivalent :
       *this <  0 ? weak_ordering::less :
                    weak_ordering::greater;

例外

投げない

例

#include <iostream>
#include <compare>

int main()
{
  std::strong_ordering strong = 1 <=> 2;
  std::weak_ordering weak = strong;

  std::cout << std::boolalpha;
  std::cout << (weak == 0) << std::endl;
  std::cout << (weak != 0) << std::endl;
  std::cout << (weak <  0) << std::endl;
  std::cout << (weak <= 0) << std::endl;
  std::cout << (weak >  0) << std::endl;
  std::cout << (weak >= 0) << std::endl;
}

xxxxxxxxxx
 
#include <iostream>
#include <compare>
​
int main()
{
  std::strong_ordering strong = 1 <=> 2;
  std::weak_ordering weak = strong;
​
  std::cout << std::boolalpha;
  std::cout << (weak == 0) << std::endl;
  std::cout << (weak != 0) << std::endl;
  std::cout << (weak <  0) << std::endl;
  std::cout << (weak <= 0) << std::endl;
  std::cout << (weak >  0) << std::endl;
  std::cout << (weak >= 0) << std::endl;
}
​

出力

false
true
true
true
false
false

Class / Function / Type

Header file

Other / All

std::strong_ordering::operator weak_ordering

概要

戻り値

例外

例

出力

バージョン

言語

処理系

参照