action_widget | A widget system for Ruby on Rails and Middleman | Application Framework library

I have a class with two functions which start and stop a collection of things. As the two functions are identical except that they ultimately call a start or stop function on each thing respectively, I would like to refactor the code so that I move the body of the code to general function and my start and stop collections call this passing in an extra parameter which is a the function they must call to start or stop.

Naturally, there are lots of std::bind() tutorials and examples online, but I have not found any article or question/answer here that covers all the following specific constraints that I face:

• The function being bound is a member which complicates things; it is also non-const
• The function being bound is also overloaded so must be distinguished properly
• Most of the std::bind() examples use auto but in this case I need to know the type of the return from std::bind() in order to pass as a parameter to action_widgets()
• There are two bools, a & b, which are effectively constant and could be bound into the function though I've not yet done that here. One thing at a time.

Here's an example of what I'm trying to achieve: