changed highlighter behaviour when no input file is given

examples/SyntaxHighlighter/src/main.cpp

@@ -4,12 +4,14 @@
 #include <fstream>
 
 int main(int argc, char** argv) {
+    ConsoleHighlighter *highlighter;
     if(argc == 2) {
         std::ifstream in(argv[1]);
-        ConsoleHighlighter highlighter(in);
-        highlighter.highlight(std::cout);
+        highlighter = new ConsoleHighlighter(in);
     } else {
-        std::cout << "Usage: " << argv[0] << " <filename.xml>\n";
+        highlighter = new ConsoleHighlighter(std::cin);
     }
+    highlighter->highlight(std::cout);
+    delete highlighter;
     return 0;
 }