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From: "lnicoara at thinkoid dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/106310] New: Failure to resolve call to template member
 function in template base class.
Date: Thu, 14 Jul 2022 23:46:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106310

            Bug ID: 106310
           Summary: Failure to resolve call to template member function in
                    template base class.
           Product: gcc
           Version: 12.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: lnicoara at thinkoid dot org
  Target Milestone: ---

The following test case fails to compile with gcc (and I believe it should
correctly resolve the call to Base< T >::set):

$ cat t.cc; g++ -c t.cc
#include <set>

using namespace std;

namespace X {

template< typename T >
struct Base
{
        template< std::size_t > void set(T const &) { }
};

template< typename T >
struct Derived : Base< T >
{
        void f(T const &arg) {
                this->template set< 0 >(arg);
        }
};

}
t.cc: In member function =E2=80=98void X::Derived<T>::f(const T&)=E2=80=99:
t.cc:17:39: error: type/value mismatch at argument 1 in template parameter =
list
for =E2=80=98template<class _Key, class _Compare, class _Alloc> class std::=
set=E2=80=99
   17 |                 this->template set< 0 >(arg);
      |                                       ^
t.cc:17:39: note:   expected a type, got =E2=80=980=E2=80=99
t.cc:17:39: error: template argument 2 is invalid
t.cc:17:39: error: template argument 3 is invalid=