Use an enum class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210623 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-readobj/Error.cpp

@@ -29,8 +29,8 @@ const char *_readobj_error_category::name() const {
   return "llvm.readobj";
 }
 
-std::string _readobj_error_category::message(int ev) const {
-  switch (ev) {
+std::string _readobj_error_category::message(int EV) const {
+  switch (static_cast<readobj_error>(EV)) {
   case readobj_error::success: return "Success";
   case readobj_error::file_not_found:
     return "No such file.";
@@ -42,14 +42,13 @@ std::string _readobj_error_category::message(int ev) const {
     return "Unsupported object file format.";
   case readobj_error::unknown_symbol:
     return "Unknown symbol.";
-  default:
-    llvm_unreachable("An enumerator of readobj_error does not have a message "
-                     "defined.");
   }
+  llvm_unreachable("An enumerator of readobj_error does not have a message "
+                   "defined.");
 }
 
-error_condition _readobj_error_category::default_error_condition(int ev) const {
-  if (ev == readobj_error::success)
+error_condition _readobj_error_category::default_error_condition(int EV) const {
+  if (static_cast<readobj_error>(EV) == readobj_error::success)
     return error_condition();
   return errc::invalid_argument;
 }

tools/llvm-readobj/Error.h

@@ -20,28 +20,20 @@ namespace llvm {
 
 const error_category &readobj_category();
 
-struct readobj_error {
-  enum _ {
-    success = 0,
-    file_not_found,
-    unsupported_file_format,
-    unrecognized_file_format,
-    unsupported_obj_file_format,
-    unknown_symbol
-  };
-  _ v_;
-
-  readobj_error(_ v) : v_(v) {}
-  explicit readobj_error(int v) : v_(_(v)) {}
-  operator int() const {return v_;}
+enum class readobj_error {
+  success = 0,
+  file_not_found,
+  unsupported_file_format,
+  unrecognized_file_format,
+  unsupported_obj_file_format,
+  unknown_symbol
 };
 
 inline error_code make_error_code(readobj_error e) {
   return error_code(static_cast<int>(e), readobj_category());
 }
 
 template <> struct is_error_code_enum<readobj_error> : std::true_type { };
-template <> struct is_error_code_enum<readobj_error::_> : std::true_type { };
 
 } // namespace llvm