Can I use a lambda function or std::function object in place of a function pointer?

Question

I\'ve got a library that I need to use that defines the following:

typedef void CallbackFunction(const int& i);

and has a function to regis

Answer 1

You can't use lambdas, because your registerCallback function expects pointer to non-member function. The only way to pass additional parameter to free standing function is 1) using global (static) data or 2) making it a template taking compile time constants, e.g.

template void callback(const int& i)
{ /* can use data */ }

registerCallback(callback<10>);