Question

What’s wrong with this code? gcc 4.6.1 is complaining “‘foo’ was not declared in this scope” in baz(). If I transform the code so that one of the templates is just a regular class, the problem goes away.

struct Foo {
    char foo;
};

template<int N>
struct Bar : public Foo
{
    Bar() { foo; }
};

template<int N>
struct Baz : public Bar<N>
{
    void baz() { foo; }
};

int main() {
    Baz<10> f;
    return 0;
}

Answer 1

What is wrong, according to the specifications, I don’t know, but you may make your code to compile by using:

void baz() { Bar<N>::foo; }