enabled and fixed modernize-use-override clang-tidy warnings (#552)

Author: firewave

.clang-tidy

@@ -36,7 +36,6 @@ Checks: >
         -modernize-use-equals-delete,
         -modernize-use-default-member-init,
         -modernize-use-nodiscard,
-        -modernize-use-override,
         -modernize-use-trailing-return-type,
         -modernize-use-using,
         -readability-avoid-nested-conditional-operator,

simplecpp.cpp

@@ -358,16 +358,16 @@ class StdIStream : public simplecpp::TokenList::Stream {
         init();
     }
 
-    virtual int get() override {
+    int get() override {
         return istr.get();
     }
-    virtual int peek() override {
+    int peek() override {
         return istr.peek();
     }
-    virtual void unget() override {
+    void unget() override {
         istr.unget();
     }
-    virtual bool good() override {
+    bool good() override {
         return istr.good();
     }
 
@@ -386,20 +386,20 @@ class StdCharBufStream : public simplecpp::TokenList::Stream {
         init();
     }
 
-    virtual int get() override {
+    int get() override {
         if (pos >= size)
             return lastStatus = EOF;
         return str[pos++];
     }
-    virtual int peek() override {
+    int peek() override {
         if (pos >= size)
             return lastStatus = EOF;
         return str[pos];
     }
-    virtual void unget() override {
+    void unget() override {
         --pos;
     }
-    virtual bool good() override {
+    bool good() override {
         return lastStatus != EOF;
     }
 
@@ -429,20 +429,20 @@ class FileStream : public simplecpp::TokenList::Stream {
         file = nullptr;
     }
 
-    virtual int get() override {
+    int get() override {
         lastStatus = lastCh = fgetc(file);
         return lastCh;
     }
-    virtual int peek() override {
+    int peek() override {
         // keep lastCh intact
         const int ch = fgetc(file);
         unget_internal(ch);
         return ch;
     }
-    virtual void unget() override {
+    void unget() override {
         unget_internal(lastCh);
     }
-    virtual bool good() override {
+    bool good() override {
         return lastStatus != EOF;
     }