https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83417
Bug ID: 83417
Summary: Pointer-to-member template parameter with auto member
type dependent container type does not work (C++17)
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ambrop7 at gmail dot com
Target Milestone: ---
The following C++17 program does not compile with GCC 7.2.0 but does with Clang
5.0.0:
template <typename T, auto T::*M> void f() {}
struct A { int x; };
int main() {
f<A, &A::x>();
return 0;
}
The error is:
test.cpp: In function ‘int main()’:
test.cpp:4:17: error: no matching function for call to ‘f<A, &A::x>()’
f<A, &A::x>();
^
test.cpp:1:40: note: candidate: template<class T, auto T::* M> void f()
template <typename T, auto T::*M> void f() {}
^
test.cpp:1:40: note: template argument deduction/substitution failed:
test.cpp:4:17: error: unable to deduce ‘auto T::*’ from ‘&A::x’
f<A, &A::x>();
^
test.cpp:4:17: note: mismatched types ‘T’ and ‘A’
