From Cppreference
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T& operator[]( const Key& key );
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(1)
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T& operator[]( Key&& key );
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(2)
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(C++11 feature)
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Inserts a new element to the container using key as the key and default constructed mapped value and returns a reference to the newly constructed mapped value. If an element with key key already exists, no insertion is performed and a reference to its mapped value is returned.
1) Essentially performs (insert(std::make_pair(key, T())).first)->second.
2) Essentially performs (insert(std::make_pair(std::move(key), T())).first)->second.
[edit] Parameters
key
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-
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the key of the element to find
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[edit] Return value
reference to the mapped value of the new element if no element with key key existed. Otherwise a reference to the mapped value of the existing element is returned.
[edit] Complexity
[edit] See also
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access specified element with bounds checking (public member function)
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