Question

I have a function func which returns true or false. Until func returns false, I want to keep calling it. What is the least awkward way to do this?

do {
  // do nothing
} while (func());

or..

while (func());

or..

while (func())
  if (!func())
    break;

All of them look really awkward and unintuitive to me. Is there another solution to this altogether?

Answer 1

I think option B is most commonly used, but you should make it more obvious that you have an empty loop body:

while (func())
  ; // do nothing

or

while (func())  { /* do nothing */ }

As a side note, this looks like some kind of busy waiting. If this is the case, it can and should usually be avoided by using OS-provided synchronization primitives.