Handle explicit cast of union member

Author: lucic71

cpp2rust/converter/models/converter_refcount.cpp

@@ -1299,9 +1299,17 @@ bool ConverterRefCount::VisitExplicitCastExpr(clang::ExplicitCastExpr *expr) {
     } else if (expr->getSubExpr()->getType()->isPointerType() &&
                !expr->getSubExpr()->isNullPointerConstant(
                    ctx_, clang::Expr::NPC_ValueDependentIsNull)) {
-      StrCat(std::format("({}.to_strong().as_pointer() as {})",
-                         ToString(expr->getSubExpr()),
-                         ToString(expr->getType())));
+      auto src_pointee = expr->getSubExpr()->getType()->getPointeeType();
+      auto dst_pointee = expr->getType()->getPointeeType();
+      if (ctx_.hasSameUnqualifiedType(src_pointee, dst_pointee)) {
+        StrCat(std::format("({}.to_strong().as_pointer() as {})",
+                           ToString(expr->getSubExpr()),
+                           ToString(expr->getType())));
+      } else {
+        StrCat(std::format("{}.reinterpret_cast::<{}>()",
+                           ToString(expr->getSubExpr()),
+                           ConvertPointeeType(expr->getType())));
+      }
       return false;
     }
     return Converter::VisitExplicitCastExpr(expr);