ANTLR4 v4.7.1 CPP target- visitor bad_cast error

[Rachana Koneru]

Hi,

I'm trying to use a custom visitor class for a simple expression grammar.

// .h
class MyVisitor: public MyParserBaseVisitor ...

// .cpp  
  Any MyVisitor::visitExpr(MyParser::ExprContext *ctx) {
    auto result = visitChildren(ctx);
    std::cout<< result.as<int>() << std::endl;
    return result;
  }

  Any MyVisitor::visitInteger(MyParser::IntegerContext *ctx) {
    return atoi(ctx->start->toString().c_str());
  }

result.as<int>() throws a bad_cast exception and result.isNull() always return true. What am I doing wrong here? 

Also, can I use anltrcpp::Any to return a pointer to a custom class object or does it only work with primitives?