Compiler Error C2698
the using-declaration for 'declaration 1' cannot co-exist with the existing using-declaration for 'declaration 2'
Once you have a using declaration for a data member, any using declaration in the same scope that uses the same name is not permitted, as only functions can be overloaded.
The following sample generates C2698:
// C2698.cpp
struct A {
int x;
};
struct B {
int x;
};
struct C : A, B {
using A::x;
using B::x; // C2698
}
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