Why does this C++ template produce an error asking for the missing semicolon? -

i'm typing in code explaining how binders work, "beyond standard library" bjorn karlsson. using visual studio 2010 express, , getting missing semi colon error.

this bit seems fine:

// template simple function object ///////////////////////////////////////////////////////////////////////////// template<typename r, typename t, typename arg>   class simple_bind_t {     typedef r (t::*fn) (arg);  // fn defines type - ptr member fn                                // of object t, returning r, , taking arg      fn _fn;                    // function object owns pointer function.     t  _t;                     // owns object of type t.    public:      simple_bind_t(fn f, const t& t):              _fn(fn), _t(t) {} // instantiate mber variables      r operator()(arg& a)      {        return (_t->_fn)(a);    // invoke member function on t, pass arg.     }    }; 

so bit fine. when go define actual function creates function object, (see code snippet below), little red line underneath r of line r (t::*fn)(arg),. when roll mouse on says - error: expected ';').

template <class r, class t, class arg>     simple_bind_t<r,t,arg> simple_bind (      r (t::*fn)(arg),                           const t& t,      const placeholder&)    { return simple_bind_t<r,t,arg>(fn,t); } // construct object of simple_bind_t<r,t,arg>                                         // pass pointer member function, fn                                         // , object of type t bind to, t 

can spot syntax error is?

you’ve made typo here:

simple_bind_t(fn f, const t& t):          _fn(fn), _t(t) {} // instantiate mber variables // ----------^^ 

fn names type, meant use argument, f. there may other errors since didn’t post complete enough code (for instance, definition of placeholder missing), it’s impossible find them.