Passing a pointer to Scanner instead of reference.

This way, we can handle std::cin easier.

Scanner.hpp

@@ -30,7 +30,7 @@ namespace monicelli {
 
 class Scanner: public yyFlexLexer {
 public:
-    Scanner(std::istream &in): yyFlexLexer(&in) {}
+    Scanner(std::istream *in): yyFlexLexer(in) {}
 
     int yylex(Parser::semantic_type *lval, Parser::location_type *loc) {
         this->lval = lval;

main.cpp

@@ -27,7 +27,7 @@ using namespace monicelli;
 
 int main(int argc, char **argv) {
     Program program;
-    Scanner scanner(std::cin);
+    Scanner scanner(&std::cin);
     Parser parser(scanner, program);
 
 #if YYDEBUG