compat: fix clang compile-time error

Add test.

2 files changed, 6 insertions, 1 deletions

diff --git a/compat/array-size.hpp b/compat/array-size.hpp
index fd313e6e..98da4d1e 100644
--- a/compat/array-size.hpp
+++ b/compat/array-size.hpp
@@ -9,9 +9,9 @@ template<typename T, size_t N> struct array_size_<T(*)[N]> : std::integral_const
 template<typename T, size_t N> struct array_size_<T[N]> : std::integral_constant<size_t, N> {};
 template<typename T, size_t N> struct array_size_<std::array<T, N>> : std::integral_constant<size_t, N> {};
 template<typename T, size_t N> struct array_size_<StaticArray<N, T>> : std::integral_constant<size_t, N> {};
-template<size_t N, class T, class U> constexpr std::size_t arraySize(U(T::*)[N]) { return N; }
 
 template<typename C, typename T> struct array_size_<T C::*> : std::integral_constant<size_t, array_size_<std::remove_cvref_t<T>>::value> {};
+//template<typename T, typename U, size_t N> struct array_size_< T(U::*)[N] > : std::integral_constant<size_t, N> {}; // should be redundant
 
 } // namespace floormat::detail
 
diff --git a/test/util.cpp b/test/util.cpp
index 48332621..e250b072 100644
--- a/test/util.cpp
+++ b/test/util.cpp
@@ -11,6 +11,7 @@ struct Foo
     static constexpr const void* Array_2[22] = {};
 
     std::array<int, 33> array_3;
+    int array_4[55] = {};
 };
 
 constexpr bool test_array_size()
@@ -27,6 +28,10 @@ constexpr bool test_array_size()
 
     fm_assert(static_array_size<const int(&)[44]> == 44);
 
+    fm_assert(static_array_size<decltype(Foo::array_4)> == 55);
+    fm_assert(array_size(&Foo::array_4) == 55);
+    fm_assert(array_size(Foo{}.array_4) == 55);
+
     return true;
 }