std::unordered_map at() method
- since C++11
// (1) Non const version
T& at( const Key& key );
// (2) Const version
const T& at( const Key& key ) const;
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.
Complexity
Average case, constant - O(1).
Worst case, linear in size of the containter - O(log size()).
Exceptions
std::out_of_range if the container does not have an element with the specified key.
Examples
important
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