Error defining explicit operator bool() outside class

Question

I have problem defining operator bool() function outside the class

class A{

public:
    explicit operator bool() const; 
};

I am defining the function outside class as...

explicit A::operator bool() const {
    ...
}

I get this error - error: ‘explicit’ outside class declaration

What is it that am doing wrong?

Remove `explicit` when defining the operator. Declaration is enough. — Gasper, Apr 27 '17 at 15:09
When you get an error `error: 'blah' in situation X` and it is in situation X, try ... removing ... 'blah' ... and ... seeing ... what ... happens. — Yakk - Adam Nevraumont, Apr 27 '17 at 15:23

score 6 · Answer 1 · answered Apr 27 '17 at 15:13

Just like you're not supposed to write inline for the definition if you already wrote it for the declaration, you are not allowed to write explicit outside of a class definition:

It may only appear within the decl-specifier-seq of the declaration of such a function within its class definition.

So, just remove it:

/*explicit*/ A::operator bool() const {
    // ...
}

Error defining explicit operator bool() outside class

1 Answers1