Fixed problems with code "enum class { };" (which is valid C)

lib/tokenize.cpp

@@ -7355,8 +7355,8 @@ void Tokenizer::simplifyEnum()
             Token *typeTokenStart = nullptr;
             Token *typeTokenEnd = nullptr;
 
-            // check for C++0x enum class
-            bool enumClass = Token::Match(tok->next(), "class|struct");
+            // check for C++11 enum class
+            bool enumClass = isCPP() && Token::Match(tok->next(), "class|struct");
             if (enumClass)
                 tok->deleteNext();
 
@@ -7522,7 +7522,7 @@ void Tokenizer::simplifyEnum()
                 std::string pattern;
                 if (!className.empty())
                     pattern += className + " :: ";
-                if (enumClass)
+                if (enumClass && enumType)
                     pattern += enumType->str() + " :: ";
 
                 int level = 0;

test/testsimplifytokens.cpp

@@ -6736,14 +6736,14 @@ private:
     }
 
     // Check simplifyEnum
-    std::string checkSimplifyEnum(const char code[]) {
+    std::string checkSimplifyEnum(const char code[], bool cpp = true) {
         errout.str("");
         // Tokenize..
         Settings settings;
         settings.addEnabled("style");
         Tokenizer tokenizer(&settings, this);
         std::istringstream istr(code);
-        tokenizer.tokenize(istr, "test.cpp");
+        tokenizer.tokenize(istr, cpp?"test.cpp":"test.c");
         return tokenizer.tokens()->stringifyList(0, true);
     }
 
@@ -6907,6 +6907,14 @@ private:
             const char expected[] = "unsigned long long e1 ; e1 = 0 ;";
             ASSERT_EQUALS(expected, checkSimplifyEnum(code));
         }
+
+        {
+            const char code[] = "enum class { A };\n"
+                                "int i = A;";
+            const char expected [] = "int i ; i = 0 ;";
+            ASSERT_EQUALS(expected, checkSimplifyEnum(code, false)); // Compile as C code: enum has name 'class'
+            checkSimplifyEnum(code, true); // Compile as C++ code: Don't crash
+        }
     }
 
     void enum16() { // ticket #1988