C++ Programming Code Examples

Get iterator to element. Searches the container for an element with a key equivalent to k and returns an iterator to it if found, otherwise it returns an iterator to map::end. Two keys are considered equivalent if the container's comparison object returns false reflexively (i.e., no matter the order in which the elements are passed as arguments). Another member function, map::count, can be used to just check whether a particular key exists. Key to be searched for. Member type key_type is the type of the keys for the elements in the container, defined in map as an alias of its first template parameter (Key). The function accepts one mandatory parameter key which specifies the key to be searched in the map container. C++ map find() function is used to find an element with the given key value k. If it finds the element then it returns an iterator pointing to the element. Otherwise, it returns an iterator pointing to the end of the map, i.e., map::end(). Function returns an iterator to the element, if an element with specified key is found, or map::end otherwise. If the map object is const-qualified, the function returns a const_iterator. Otherwise, it returns an iterator. Member types iterator and const_iterator are bidirectional iterator types pointing to elements (of type value_type). Notice that value_type in map containers is an alias of pair<const key_type, mapped_type>. Logarithmic in size No changes The container is accessed (neither the const nor the non-const versions modify the container). No mapped values are accessed: concurrently accessing or modifying elements is safe. Strong guarantee: if an exception is thrown, there are no changes in the container.