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リファレンス
string
basic_string
swap (非メンバ関数)

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

履歴編集

function template

std::swap (非メンバ関数)

namespace std {
  template <class CharT, class Traits, class Allocator>
  void swap(basic_string<CharT, Traits, Allocator>& x,
            basic_string<CharT, Traits, Allocator>& y); // (1) C++98
  template <class CharT, class Traits, class Allocator>
  void swap(basic_string<CharT, Traits, Allocator>& x,
            basic_string<CharT, Traits, Allocator>& y)
    noexcept(noexcept(lhs.swap(rhs)));                 // (1) C++17
  template <class CharT, class Traits, class Allocator>
  constexpr
  void swap(basic_string<CharT, Traits, Allocator>& x,
            basic_string<CharT, Traits, Allocator>& y)
    noexcept(noexcept(lhs.swap(rhs)));                 // (1) C++20
}

概要

2つのbasic_stringオブジェクトを入れ替える

効果

x.swap(y)

戻り値

なし

例

#include <iostream>
#include <string>

int main()
{
  std::string a = "hello";
  std::string b = "world";

  std::swap(a, b);

  std::cout << a << std::endl;
  std::cout << b << std::endl;
}

出力

world
hello

参照

N4258 Cleaning-up noexcept in the Library, Rev 3
- noexcept 追加の経緯となる提案文書
P0980R1 Making std::string constexpr

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