mclow.lists added a comment.
Complete reproducer:
// Tested with with: clang++ -std=c++14 -Wunused-function UnusedFVassily.cpp
//
// UnusedFVassily.cpp:8:39: warning: unused function '__test'
[-Wunused-function]
// template <class _Up> static __two __test(...);
// ^
// UnusedFVassily.cpp:9:38: warning: unused function '__test'
[-Wunused-function]
// template <class _Up> static char __test(typename _Up::pointer* = 0);
// ^
// 2 warnings generated.
#include <type_traits>
namespace foo {
struct __two {char __lx; char __lxx;};
namespace __has_pointer_type_imp
{
template <class _Up> static __two __test(...);
template <class _Up> static char __test(typename _Up::pointer* = 0);
}
template <class _Tp>
struct __has_pointer_type
: public std::integral_constant<bool,
sizeof(__has_pointer_type_imp::__test<_Tp>(0)) == 1>
{
};
}
struct S1 {};
struct S2 { typedef void *pointer; };
int main () {
static_assert (!foo::__has_pointer_type<S1>::value, "" );
static_assert ( foo::__has_pointer_type<S2>::value, "" );
}
https://reviews.llvm.org/D29877
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