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

From cppreference.com
< cpp‎ | container‎ | map
 
 
 
 
T& at( const Key& key );
(1)
const T& at( const Key& key ) const;
(2)

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.

Contents

[edit] Parameters

key - the key of the element to find

[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 specified key

[edit] Complexity

Logarithmic in the size of the container.

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 464 C++98 map did not have this member function added

[edit] See also

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