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最終更新日時: 2026年08月25日 12時11分17秒 (JST)
Akira Takahashi が更新

function template

std::operator>

namespace std {
  // operator<=>により、以下の演算子が使用可能になる (C++20)
  template <class CharT, class Traits, class Allocator>
  bool
    operator>(const basic_string<CharT, Traits, Allocator>& a,
              const basic_string<CharT, Traits, Allocator>& b);          // (1) C++98
  template <class CharT, class Traits, class Allocator>
  bool
    operator>(const basic_string<CharT, Traits, Allocator>& a,
              const basic_string<CharT, Traits, Allocator>& b) noexcept; // (1) C++14
  template <class CharT, class Traits, class Allocator>
  constexpr bool
    operator>(const basic_string<CharT, Traits, Allocator>& a,
              const basic_string<CharT, Traits, Allocator>& b) noexcept; // (1) C++20

  template <class CharT, class Traits, class Allocator>
  bool
    operator>(const CharT* a,
              const basic_string<CharT, Traits, Allocator>& b); // (2) C++98
  template <class CharT, class Traits, class Allocator>
  constexpr bool
    operator>(const CharT* a,
              const basic_string<CharT, Traits, Allocator>& b); // (2) C++20

  template <class CharT, class Traits, class Allocator>
  bool
    operator>(const basic_string<CharT, Traits, Allocator>& a,
              const CharT* b);                                // (3) C++98
  template <class CharT, class Traits, class Allocator>
  constexpr bool
    operator>(const basic_string<CharT, Traits, Allocator>& a,
              const CharT* b);                                // (3) C++20
}

概要

basic_stringにおいて、左辺が右辺より大きいかの判定を行う。

戻り値

(1) a.compare(b) > 0
(2) b.compare(a) < 0
(3) a.compare(b) > 0

例

#include <iostream>
#include <string>

int main()
{
  std::string a = "bbb";
  std::string b = "aaa";

  std::cout << std::boolalpha;
  std::cout << (a > b) << std::endl;
}

出力

true

参照

LWG2064 - More noexcept issues in basic_string
P0980R1 Making std::string constexpr
P1614R2 The Mothership has Landed
- C++20での三方比較演算子の追加と、関連する演算子の自動導出

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