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std::unordered_map::at(3) | C++ Standard Libary | std::unordered_map::at(3) |
NAME¶
std::unordered_map::at - std::unordered_map::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¶
Average case: constant, worst case: linear in size.
See also¶
operator[] access or insert specified element
(C++11) (public member function)
2022.07.31 | http://cppreference.com |