Member Avatar for IAMADOG

I was looking at some sample code here and it had this for error handling:

#define handle_error(msg) \
    do { perror(msg); exit(EXIT_FAILURE); } while (0)

If I remember correctly do {} while (0) would execute only once, so what is the point of this?

  • 2 Contributors
  • 1 Reply
  • 125 Views
  • 7 Minutes Discussion Span
  • Latest Post Latest Post by deceptikon
Member Avatar for deceptikon

Put simply, the point is to enforce a trailing semicolon on calls to the macro without losing the massive benefits of having the macro wrapped in its own scope.

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.