src: introduce upx::ptr_reinterpret_cast

src/util/cxxlib.h

@@ -31,6 +31,24 @@
 
 namespace upx {
 
+/*************************************************************************
+// misc
+**************************************************************************/
+
+// a reinterpret_cast that does not trigger -Wcast-align warnings
+template <class Result, class From>
+forceinline Result ptr_reinterpret_cast(From *ptr) {
+    static_assert(std::is_pointer_v<Result>);
+    static_assert(!std::is_const_v<std::remove_pointer_t<Result> >); // enforce same constness
+    return (Result) (void *) ptr;
+}
+template <class Result, class From>
+forceinline Result ptr_reinterpret_cast(const From *ptr) {
+    static_assert(std::is_pointer_v<Result>);
+    static_assert(std::is_const_v<std::remove_pointer_t<Result> >); // required
+    return (Result) (const void *) ptr;
+}
+
 /*************************************************************************
 // type_traits
 **************************************************************************/