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c++error-handlingnull-object-pattern

C++: Return NULL instead of struct

I have a struct Foo. In pseudocode:

def FindFoo:
   foo = results of search
   foundFoo = true if a valid foo has been found  

   return foo if foundFoo else someErrorCode

How can I accomplish this in C++?

Edited to remove numerous inaccuracies.

Solution

  • C++ objects can never be null or empty. Pointers can hold a null pointer value indicating they point at nothing.

    The typical solution would be to throw an exception. Otherwise, use a pointer; just make sure you aren't returning the address of a temporary.

    I wouldn't recommend trying to teach yourself C++ with knowledge from other languages, you'll hurt yourself. Grab a good beginner-level book, it's the best way to learn.