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template <class... Args>
iterator emplace_hint( const_iterator hint, Args&&... args );
hint一个建议，其中的元素。该元件是构成在就地，即没有复制或移动操作进行。 The constructor of the element is called with exactly the same arguments as supplied to the function, forwarded with std::forward<Args>(args)....
hintas a suggestion where the element should go. The element is constructed in-place, i.e. no copy or move operations are performed. The constructor of the element is called with exactly the same arguments as supplied to the function, forwarded with std::forward<Args>(args)....
No iterators or references are invalidated.
If the insertion failed because the element already exists, returns an iterator to the already existing element with the equivalent key.
Logarithmic in the size of the container in general, but amortized constant if the new element is inserted just before
| constructs element in-place |