From Cppreference
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T& at( const Key& key );
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(1)
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(C++11 feature)
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T& at( Key&& key );
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(2)
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(C++11 feature)
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Returns a reference to the mapped value of the element with key equivalent to key. If no such element exist, exception of type std::out_of_range is thrown.
[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 requested element
[edit] Exceptions
std::out_of_range if the container does not have an element with the key key
[edit] Complexity
[edit] See also
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access specified element (public member function)
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