Question

In C++, is it possible to make a bool & argument of a function optional?

void foo(bool &argument = /* What goes here? */);

In my function foo, if the caller does not care about the result put into argument, I’d like the compiler to give a dummy location by default. Otherwise, callers who do not care must do this:

bool ignored;

foo(ignored);

Answer 1

Make another function

void foo(){
  bool b=true;
  foo(b);
}