How can I select a specific function overload?

Question

I want to pass an overloaded operator to a function, which can\'t figure out which of the two overloads it should use.

// This works, not overloaded:
chai.add(ch         


        

Answer 1

The following may help you to choose one overload of map::operator[]

static_cast<
    std::string& (std::map::*)(const std::string&)>(
        &std::map::operator []);

Or with a typedef:

using MyMap = std::map;

static_cast(&MyMap::operator []);
//          ReturnType    Class     params