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From: "mick.pearson at wildblue dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/97710] Help with breaking change? cast pointer-to-member
 address in template parameter list
Date: Wed, 04 Nov 2020 11:48:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97710

--- Comment #4 from Mick P. <mick.pearson at wildblue dot net> ---
Sorry, here is an example diagnostic. The reason I couldn't follow it yeste=
rday
is "make -j4" was causing the output to be scrambled.

>/home/Michael/collada/dom/include/dae/domAny.h:62:33: error: 'reinterpret_=
cast' is not a constant expression
>   62 |  DAEP::Value<0,xsAnyAttribute,_,(_::_)&_::_0> attrAny_et_cetera__v=
alue;
>      |                                 ^~~~~~~~~~~~
>/home/Michael/collada/dom/include/dae/domAny.h:62:33: error: '(ColladaDOM_=
3::DAEP::Elemental<ColladaDOM_3::domAny, 97, ColladaDOM_3::daeElement>::_)&=
ColladaDOM_3::domAny::_::_0' is not a valid template argument for type 'cha=
r ColladaDOM_3::domAny::*'
>/home/Michael/collada/dom/include/dae/domAny.h:62:33: note: because it is =
a member of 'ColladaDOM_3::domAny::_'

>"The above isn't self-contained either, T isn't defined."

I just meant to explain the underlying problem, since it's a different prob=
lem.

I can't get code highlighting to work with ``` or {{{. T would be something
like the following:

template<class A, int A::*> struct T{};

Maybe this link works? https://godbolt.org/z/fYEYGP

Output is similar:

template<class A, int A::*> struct T{};
struct A{};
struct B:A{ int x; };
struct C:A{ T<A,(char A::*)&B::x> y; };

I don't know, for casting purposes this seems logical, like something should
work, and had worked before.=