https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77725
Bug ID: 77725
Summary: An example from the standard regarding member lookup
fails to compile
Product: gcc
Version: 6.1.0
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ilaizi at microsoft dot com
Target Milestone: ---
Example of valid code from the standard (10.2.7 Member name lookup
[class.member.lookup])
compiled with command: "g++ -std=c++11 main.cpp && ./a.out" on Linux
compiler version:
g++ (GCC) 6.1.0
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
===================================================================================
struct A { int x; }; // S(x,A) = { { A::x }, { A } }
struct B { float x; }; // S(x,B) = { { B::x }, { B } }
struct C: public A, public B { }; // S(x,C) = { invalid, { A in C, B in C
} }
struct D: public virtual C { }; // S(x,D) = S(x,C)
struct E: public virtual C { char x; }; // S(x,E) = { { E::x }, { E } }
struct F: public D, public E { }; // S(x,F) = S(x,E)
int main()
{
F f;
f.x = 0; // OK, lookup finds E::x
}
===================================================================================
Error message:
main.cpp: In function 'int main()':
main.cpp:11:6: error: request for member 'x' is ambiguous
f.x = 0; // OK, lookup finds E::x
^
main.cpp:2:18: note: candidates are: float B::x
struct B { float x; }; // S(x,B) = { { B::x }, { B } }
^
main.cpp:1:16: note: int A::x
struct A { int x; }; // S(x,A) = { { A::x }, { A } }
^
