Use of for_each on map elements

Question

I have a map where I\'d like to perform a call on every data type object member function. I yet know how to do this on any sequence but, is it possible to do it on an associativ

Answer 1

You can iterate through a std::map object. Each iterator will point to a std::pair where T and S are the same types you specified on your map.

Here this would be:

for (std::map::iterator it = Map.begin(); it != Map.end(); ++it)
{
  it->second.Method();
}

If you still want to use std::for_each, pass a function that takes a std::pair& as an argument instead.

Example:

void CallMyMethod(std::pair& pair) // could be a class static method as well
{
  pair.second.Method();
}

And pass it to std::for_each:

std::for_each(Map.begin(), Map.end(), CallMyMethod);