callback vs lambda

Question

Suppose I have the following code that I wish to refactor:

int toFuture()
{
  precalc();
  int calc = 5 * foobar_x() + 3;
  postcalc();
  return calc;
}

int toP         


        

Answer 1

There is a C/C++ way to do this, and a C++11 way. Neither way involves lambdas or templates.

The C/C++ way:

double MyFunc (int x, float y) { return x + y ; }

int main()
  {
  double (*pf) (int, float) ;
  pf = MyFunc ;
  pf (101, 202.0) ;
  }

The C++11 way:

#include 

double MyFunc (int x, float y) { return x + y ; }

int main()
  {
  std::function f ;
  f = MyFunc ;
  f (51, 52.0) ;
  }

In either case, you just pass pf or f to your refactored function as a parameter. Using lambdas or templates is overkill here.