nested class forward declaration

[n.torrey.pines]

I'm curious, is this legal C++ ? `g++ -pedantic -ansi -Wall` gives no
warnings.

struct s {
char c;
s(char c) : c(c) {}
void f() const;
private:
struct i; // !!!
};

struct s::i {
float f;
i() : f(0) {}
};

void s::f() const {
i ii;
std::cout << ii.f << c << '\n';
}

 

[Victor Bazarov]

I'm curious, is this legal C++ ? `g++ -pedantic -ansi -Wall` gives no
warnings.

struct s {
char c;
s(char c) : c(c) {}
void f() const;
private:
struct i; // !!!
};

struct s::i {
float f;
i() : f(0) {}
};

void s::f() const {
i ii;
std::cout << ii.f << c << '\n';
}

Yes, it is. Why wouldn't it be legal?

V

 

[Marcus Kwok]

I'm curious, is this legal C++ ? `g++ -pedantic -ansi -Wall` gives no
warnings.

struct s {
char c;
s(char c) : c(c) {}
void f() const;
private:
struct i; // !!!
};

struct s::i {
float f;
i() : f(0) {}
};

void s::f() const {
i ii;
std::cout << ii.f << c << '\n';
}

FWIW, Comeau online compiled it with no errors in strict mode either.