https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87208
Bug ID: 87208
Summary: dependent name resolution selects a function it should
have NEVER considered
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: SztfG at yandex dot ru
Target Milestone: ---
[temp.dep.res]/1: In resolving dependent names, names from the following
sources are considered:
— Declarations that are visible at the point of definition of the template.
— Declarations from namespaces associated with the types of the function
arguments both from the instantiation context and from the definition context.
In the code below, g++ selects the free operator<<(), even though it is
declared after the definition of the template and can't be found using ADL.
#include <cstdio>
struct S {
template <typename T>
void operator<<(T) { std::printf("DEFAULT\n"); }
};
namespace N {
template <typename T>
void run(const T & value) { S s; s << value; }
}
struct MyValue {};
namespace N {
void operator<<(S&, MyValue) { std::printf("OVERLOADED\n"); }
}
int main(int, char**)
{
N::run(MyValue());
}
Expected output: DEFAULT
Actual output: OVERLOADED
