std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::at (3) - Linux Man Pages

std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::at: std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::at


std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::at - std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::at


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.


key - the key of the element to find

Return value

Reference to the mapped value of the requested element


std::out_of_range if the container does not have an element with the specified key


Average case: constant, worst case: linear in size.

See also

           access or insert specified element
operator[] (public member function)