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std::variant::swap

STD：：变体：：SWAP

void swap( variant& rhs ) noexcept(/* see below */(1)(since C++17)

掉期二variant物品。

  • 如果两者都是*this和rhs例外而毫无价值，什么也不做

  • 否则，如果两者兼而有之*this和rhs保持同样的选择，呼叫swap(std::get<i>(*this), std:get<i>(rhs))何地i是index()如果抛出异常，则值的状态取决于调用的交换函数的异常安全性。

  • 否则，交换rhs和*this如果引发异常，则*this和rhs取决于变量%27s移动构造函数的异常安全。

除非类型为lvalue，否则行为是未定义的。T_i是Swappable和std::is_move_constructible_v<T_i>是true为所有人T_i在Types......

参数

rhs-a variant object to swap with

返回值

%280%29

例外

如果this->index() == rhs.index()，则可能引发任何异常。swap(std::get<i>(*this), std::get<i>(rhs))我是索引%28%29。

否则，可能引发当前持有的选项的移动构造函数引发的任何异常。*this和rhs...

noexcept规格：

noexcept(((std::is_nothrow_move_constructible_v<Types>&&

std::is_nothrow_swappable_v<Types>)&& ...))

例

 © cppreference.com

在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/实用程序/变量/交换

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