std::map<Key,T,Compare,Allocator>::at
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T& at( const Key& key );
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const T& at( const Key& key ) const;
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Returns a reference to the mapped value of the element with key equivalent to key. If no such element exists, an exception of type std::out_of_range is thrown.
Parameters
| key | - | the key of the element to find |
Return value
Reference to the mapped value of the requested element
Exceptions
std::out_of_range if the container does not have an element with the specified key
Complexity
Logarithmic in the size of the container.
See also
| access or insert specified element (public member function) |