refactor: horrible_cast implementation

Author: mutouyun

include/libimp/horrible_cast.h

@@ -23,9 +23,8 @@ union temp {
 } // namespace detail_horrible_cast
 
 template <typename T, typename U>
-constexpr auto horrible_cast(U &&in) noexcept
-  -> std::enable_if_t<(sizeof(T) == sizeof(std::decay_t<U>)), T> {
-  return detail_horrible_cast::temp<T, std::decay_t<U>>{std::forward<U>(in)}.out;
+constexpr T horrible_cast(U &&in) noexcept {
+  return detail_horrible_cast::temp<T, U>{std::forward<U>(in)}.out;
 }
 
 LIBIMP_NAMESPACE_END_

test/imp/test_imp_utility.cpp

@@ -143,7 +143,11 @@ TEST(utility, horrible_cast) {
   EXPECT_EQ(b.a_[0], 0);
 #endif
 
-  // imp::horrible_cast<std::uint32_t>(0ll);
+#if LIBIMP_ENDIAN_LIT
+  EXPECT_EQ(imp::horrible_cast<std::uint32_t>(0xff00'0000'0001ll), 1);
+#else
+  EXPECT_EQ(imp::horrible_cast<std::uint32_t>(0xff00'0000'0001ll), 0xff00);
+#endif
 }
 
 #if defined(LIBIMP_CPP_17)