std::map<Key,T,Compare,Allocator>::at (3) - Linux Manuals

std::map<Key,T,Compare,Allocator>::at: std::map<Key,T,Compare,Allocator>::at

NAME

std::map<Key,T,Compare,Allocator>::at - std::map<Key,T,Compare,Allocator>::at

Synopsis

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.