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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/66698] Multiple inheritance from instantiations of template
 class and what about access to member functions
Date: Wed, 04 Aug 2021 21:35:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D66698

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |6.1.0, 6.4.0
   Target Milestone|---                         |7.0
      Known to work|                            |7.1.0, 8.1.0

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
More self contained testcase (rather than the code snipit in comment #0):
#include <stddef.h>
#include <iostream>
template <typename C>
class S {
public:
    void add (C c) { ++cnt; }
    size_t size () const { return cnt; }

private:
    size_t cnt {};=20
};

struct Foo1 {};
struct Foo2 {};
struct Foo3 {};

class Z : public S<Foo1>, public S<Foo2>, public S<Foo3> {
public:
    using S<Foo1>::add;
    using S<Foo2>::add;
    using S<Foo3>::add;

    using S<Foo1>::size;    // (1)
    using S<Foo2>::size;    // (2)
    using S<Foo3>::size;    // (3)
};

int main(void)
{

Z z;

z.add (Foo1 {});
z.add (Foo1 {});
z.add (Foo2 {});

std::cout << z.size () << std::endl;
}=