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.
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
Average case: constant, worst case: linear in size.
See also
| access or insert specified element (public member function) |
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