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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58820] lambda multiple inheritance operator() not ambiguous
Date: Fri, 27 Aug 2021 20:47:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D58820

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Blocks|54367                       |
             Status|NEW                         |RESOLVED

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Unrelated to lambdas really.  Here is a C++98 code which shows the same iss=
ue
with clang:
template<class t>
struct i
{
    t operator()(t i);
};
struct overload_set1 : i<int>, i<double>
{
  overload_set1() {}
};
int main(void)
{
  double d1 =3D 10;
  overload_set1 tt;
  tt(d1);
}


To make the original code work (you need C++17 really):
Adding
  using Fs::operator()...;
allows GCC (and ICC) to work.

So this is a bug in clang.
I don't think we need a testcase as we must likely already have a C++98 one
even.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D54367
[Bug 54367] [meta-bug] lambda expressions=