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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/44906] g++ is giving error: parse error in template
 argument list
Date: Wed, 04 Aug 2021 06:20:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D44906

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEW
   Last reconfirmed|2011-09-23 00:00:00         |2021-8-3

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For the testcase in comment #8:

Ok, this is interesting as at first I thought this was fixed in GCC 11 but =
then
I looked to see what the different standards do as GCC 11's default is C++1=
7.

With C++17 and C++20, we get:
<source>:8:34: error: use of 'this' in a constant expression
    8 |     void add(void) { addVecVals<&vec1>();  }
      |                                  ^~~~
<source>: In instantiation of 'void MISC<T>::add() [with T =3D int]':
<source>:13:10:   required from here
<source>:8:39: error: no matching function for call to
'MISC<int>::addVecVals<(&((MISC<int>*)this)->MISC<int>::vec1)>()'
    8 |     void add(void) { addVecVals<&vec1>();  }
      |                      ~~~~~~~~~~~~~~~~~^~
<source>:7:26: note: candidate: 'template<int* vc> void MISC<T>::addVecVals=
()
[with T* vc =3D vc; T =3D int]'
    7 |     template<T* vc> void addVecVals(){}
      |                          ^~~~~~~~~~
<source>:7:26: note:   template argument deduction/substitution failed:
<source>:8:34: error: '&((MISC<int>*)this)->MISC<int>::vec1' is not a valid
template argument of type 'int*' because '((MISC<int>*)this)->MISC<int>::ve=
c1'
is not a variable
    8 |     void add(void) { addVecVals<&vec1>();  }
      |                                  ^~~~


But for C++98, C++11, C++14, we get:
<source>: In member function 'void MISC<T>::add()':
<source>:8:22: error: parse error in template argument list
    8 |     void add(void) { addVecVals<&vec1>();  }
      |                      ^~~~~~~~~~~~~~~~~=