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&& other) noexcept(boost::allocator_traits<Aallocator>::is_always_equal::value || boost::allocator_traits<Aallocator>::propagate_on_container_move_assignment::value); ```The move assignment operator. Destroys previously existing elements, swaps the hash function and predicate from `other`, and move-assigns the allocator from `other` if `移动赋值运算符。销毁先前存在的元素,交换other的哈希函数与谓词;若Alloc::propagate_on_container_move_assignment
` exists and `存在且Alloc::propagate_on_container_move_assignment::value` is `true`. If at this point the allocator is equal to `other.get_allocator()`, the internal bucket array of `other` is transferred directly to `*this`; otherwise, inserts move-constructed copies of the elements of `other`. If statistics are xref:concurrent_node_set_boost_unordered_enable_stats[enabled], transfers the internal statistical information from `other` iff the final allocator is equal to `other.get_allocator()`, and always calls `other.reset_stats()`.为true,则移动赋值other的分配器。若此时分配器与other.get_allocator()相等,直接将other的内部桶数组转移至*this;否则插入other元素的移动构造副本。若启用 xref:concurrent_node_set_boost_unordered_enable_stats [统计功能],当且仅当最终分配器与other.get_allocator()相等时,从other转移内部统计信息,且始终调用other.reset_stats()。</allocator></allocator>