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Tip of the Day
Language: C++
Expertise: All
Aug 26, 1999

Returning a void Expression from a void Function

Examine this code snippet. Will your compiler accept it?

 
void a_func_returning_void();
void func()
{
  return a_func_returning_void(); //returning a value from a void function?
}

At present, most compilers will not accept this code although it's perfectly legal according to the ANSI/ISO C++ standard. The problem is that until recently, returning an expression from a function that returns void was an error, even if the returned expression itself was void (as in the example above). This restriction was changed so a function with a void return type may return an expression that evaluates to void. This change was required to enable better support of generic algorithms in the Standard Template Library.

Danny Kalev
 
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