Hidden Features of C++? [closed]

Answer 1

void functions can return void values

Little known, but the following code is fine

void f() { }
void g() { return f(); }

Aswell as the following weird looking one

void f() { return (void)"i'm discarded"; }

Knowing about this, you can take advantage in some areas. One example: void functions can't return a value but you can also not just return nothing, because they may be instantiated with non-void. Instead of storing the value into a local variable, which will cause an error for void, just return a value directly

template
struct sample {
  // assume f may return void
  T dosomething() { return f(); }

  // better than T t = f(); /* ... */ return t; !
};