Does C++ allow default return types for functions?

In C the following horror is valid:

myFunc()
{
  return 42;  // return type defaults to int.
}

But, what about in C++? I can't find a reference to it either way...

My compiler (Codegear C++Builder 2007) currently accepts it without warning, but I've had comments that this is an error in C++.

Solution 1:

It's ill-formed in C++. Meaning that it doesn't compile with a standard conforming compiler. Paragraph 7.1.5/4 in Annex C of the Standard explains the change "Banning implicit int".

Solution 2:

Implicit return types are valid in C89, but a lot of compilers warn about it.

They are not valid in C++, nor in C99.

Solution 3:

So, it's definitely 'ill formed' C++, but it seems many compilers accept it with a warning at best.

• Codegear C++Builder 2007: No error or warning at all
• G++: Requires -W -Wall to generate warning , or -pedantic to generate error (Piotr)
• MSVC 8: produces an error (tfinniga)
• others...?

Please add to/correct this list!

Solution 4:

This is not legal C++, but some compilers will accept it either silently or with a diagnostic.