what is the meaning of percent symbol(%) and sharp symbol(#) in c++ template -

here code ms vc stl:

 template<typename _fun_t,     typename _arg_t> inline     binder1st<_fun_t> bind1st(_fun_t% _func, _arg_t _left)     {   // return binder1st functor adapter     typename _fun_t::first_argument_type _val = _left;      return (binder1st<_fun_t>(_func, _val));     } 

and qt:

 #define q_arg(type, data) qargument<type >(#type, data) 

neither of these specific templates.

the '%' microsoft extension c++, part of c++/cli. defines tracking reference. normal lvalue reference variable of type t& reference variable; t% except refers managed object might moved garbage collector; gc knows when moves objects has patch tracking references object.

'#' stringify operator of c preprocessor. means value of following macro argument, surrounded double quote marks. this:

q_arg(mytype, 12345) 

will expand this:

qargument<mytype >("mytype", 12345);