What difference in accessibility of variables is there between a normal inheritance and inheritance with templates?
For example the following code will not compile (1)(2):
template<typename T>
struct A {
T value;
};
template<typename U>
struct B : public A<U> {
U ret() {
return value; // Does not compile
}
};
template<typename U>
struct C : public A<U> {
U ret() {
return this->value; // Compiles
}
};
But the following one do compile (3):
struct A {
int value;
};
struct B : public A {
int ret() {
return value;
}
};
What part of the standard does create that (rather impractical) difference?
(1): Compiler Explorer
(2): The code can actually compile on MSVC except when MSVC is set to compile in C++20 mode
(3): Compiler Explorer
