std::map get all keys
First, include the necessary header file for the map container class, which is
Define a map variable of the desired key-value pair type, for example, std::map
mapName. Use the std::map's member function begin() to obtain an iterator pointing to the first element in the map.
Use the std::map's member function end() to obtain an iterator pointing to the position just beyond the last element in the map.
Iterate through the map using a for loop or a while loop, starting from the iterator obtained in step 3 and ending at the iterator obtained in step 4.
Access the keys using the iterator's ->first to retrieve the key associated with the current element.
Store or process the keys as needed.
Continue the iteration until reaching the end of the map.