CppCMS tutorial: Linking template statically error (controller issue)

From http://cppcms.com/wikipp/en/page/cppcms_1x_tut_hello_templates#The.controller

I've places below codes on bottom of hello.cpp:

virtual void main(std::string /*url*/)
{
    content::message c;
    c.text=">>>Hello<<<";
    render("message",c);
}

When running g++ hello.cpp my_skin.cpp -o hello -lcppcms -lbooster, got error:

hello.cpp:44:38: error: ‘virtual’ outside class declaration
hello.cpp:44:38: error: ‘::main’ must return ‘int’
hello.cpp:44:14: warning: first argument of ‘int main(std::string)’ should be ‘int’ [-Wmain]
hello.cpp:44:14: warning: ‘int main(std::string)’ takes only zero or two arguments [-Wmain]
hello.cpp: In function ‘int main(std::string)’:
hello.cpp:44:38: error: declaration of C function ‘int main(std::string)’ conflicts with
hello.cpp:27:5: error: previous declaration ‘int main(int, char**)’ here
hello.cpp: In function ‘int main(std::string)’:
hello.cpp:48:23: error: ‘render’ was not declared in this scope

Do I missed something

The error messages are telling you everything you need to know.

1. virtual can only be used in a class. Your main method is not in a class.
2. The main method must return an int. Yours is returning void.
3. You have two main methods, one that is main(std::string) and one that is main(int, char**)
4. Your render method must have a function prototype above the main method or the entire method needs to me moved.

So this would be more appropriate:

void render(std::string, std::string) // or whatever
{
   // do something
}

int main(int argc, char** argv)
{
   render("string", c);
   return 0;
}