https://llvm.org/bugs/show_bug.cgi?id=23342
Bug ID: 23342
Summary: Warn when a template class declares a dependent friend
function [-Wnon-template-friend]
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The out-of-line friend declaration is very likely broken because the
declaration is not part of the template. GCC has a -Wnon-template-friend
warning that finds this.
template <typename T>
struct Arg {
friend bool operator==(const Arg& lhs, T rhs) {
return false;
}
friend bool operator!=(const Arg& lhs, T rhs);
};
template <typename T>
bool operator!=(const Arg<T>& lhs, T rhs) {
return true;
}
bool foo() {
Arg<int> arg;
return (arg == 42) || (arg != 42);
}
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