T& at( const Key& key ); | (1) | (since C++11) |
const T& at( const Key& key ) const; | (2) | (since C++11) |
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 specified element (public member function) |
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