https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99692
Bug ID: 99692
Summary: Lookup for operator<< skips global scope
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: skaniskin at berkeley dot edu
Target Milestone: ---
The following code is rejected by g++.
#include <ostream>
#include <vector>
struct CustomStream : std::ostream {};
std::ostream& operator<<(std::ostream& s, const std::vector<int>&)
{
return s;
}
CustomStream&& operator<<(CustomStream&& s, const std::vector<int>& v)
{
static_cast<std::ostream&>(s) << v;
return std::move(s);
}
int main()
{
CustomStream() << std::vector<int>{};
}
The problem is there with all recent versions of gcc and independent of
compiler flags
