5. swap (非メンバ関数)

    • Class / Function / Type

      std::

    • Header file

      <>

    • Other / All

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    function template
    <string>

    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++03
  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