How to add valid key without specifying value to a std::map?

Question

I have a std::map, and I would like to add a valid key to iterate over it later, but without giving any value (it will be given later on in the course of the iterations).

Answer 1

you can try by just making a temporary float or any data type and initialize the value of the map with it.

#include 
#include 

as you can see in this example I have made temporary map m to initialize it to hen[s] similarly, you can create a temp float to initialize it to your map.