+TEST(FunctionRef, Traits) {
+ static_assert(std::is_literal_type<FunctionRef<int(int)>>::value, "");
+// Some earlier versions of libstdc++ lack these traits. Frustrating that
+// the value of __GLIBCXX__ doesn't increase with version, but rather reflects
+// release date, so some larger values of __GLIBCXX__ lack the traits while
+// some smaller values have them. Can't figure out how to reliably test for the
+// presence or absence of the traits. :-(
+#if !defined(__GLIBCXX__) || __GNUC__ >= 5
+ static_assert(
+ std::is_trivially_copy_constructible<FunctionRef<int(int)>>::value, "");
+ static_assert(
+ std::is_trivially_move_constructible<FunctionRef<int(int)>>::value, "");
+ static_assert(
+ std::is_trivially_constructible<
+ FunctionRef<int(int)>,
+ FunctionRef<int(int)>&>::value,
+ "");
+ static_assert(
+ std::is_trivially_copy_assignable<FunctionRef<int(int)>>::value, "");
+ static_assert(
+ std::is_trivially_move_assignable<FunctionRef<int(int)>>::value, "");
+ static_assert(
+ std::is_trivially_assignable<
+ FunctionRef<int(int)>,
+ FunctionRef<int(int)>&>::value,
+ "");
+#endif
+ static_assert(
+ std::is_nothrow_copy_constructible<FunctionRef<int(int)>>::value, "");
+ static_assert(
+ std::is_nothrow_move_constructible<FunctionRef<int(int)>>::value, "");
+ static_assert(
+ std::is_nothrow_constructible<
+ FunctionRef<int(int)>,
+ FunctionRef<int(int)>&>::value,
+ "");
+ static_assert(
+ std::is_nothrow_copy_assignable<FunctionRef<int(int)>>::value, "");
+ static_assert(
+ std::is_nothrow_move_assignable<FunctionRef<int(int)>>::value, "");
+ static_assert(
+ std::is_nothrow_assignable<
+ FunctionRef<int(int)>,
+ FunctionRef<int(int)>&>::value,
+ "");
+}
+