std::unordered_map::swap
void swap( unordered_map& other ); | | (since C++11) (until C++17) |
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void swap( unordered_map& other ) noexcept(/* see below */); | | (since C++17) |
将容器的内容与other不对单个元素调用任何移动、复制或交换操作。
所有迭代器和引用仍然有效。过去的迭代器无效.
大Hash和KeyEqual对象必须是Swappable，并且使用对非会员的非限定调用进行交换。swap...
If std::allocator_traits<allocator_type>::propagate_on_container_swap::value is true, then the allocators are exchanged using an unqualified call to non-member swap. Otherwise, they are not swapped (and if get_allocator() != other.get_allocator(), the behavior is undefined). | (since C++11) |
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参数
other | - | container to exchange the contents with |
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返回值
%280%29
例外
Any exception thrown by the swap of the Hash or KeyEqual objects. | (until C++17) |
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noexcept specification: noexcept(std::allocator_traits<Allocator>::is_always_equal::value && std::is_nothrow_swappable<Hash>::value. && std::is_nothrow_swappable<KeyEqual>::value) | (since C++17) |
复杂性
常量。
另见
std::swap(std::unordered_map) (C++11) | specializes the std::swap algorithm (function template) |
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