• tipdbmp (21/21) Dec 30 2017 import core.vararg;
• John Chapman (3/5) Dec 30 2017 Try this:

tipdbmp <email example.com> writes:

import core.vararg;

string foo(fmt, ...) {
     int args_len = _arguments.length;
     if (args_len == 1) {
         if (typeid(_arguments[0] == typeid(TypeInfo[]))) {
             _arguments = va_arg!(TypeInfo[])(_argptr);
             args_len = _arguments.length;

             // how can I adjust _argptr?
             _argptr = ???
         }
     }

     // using _arguments and va_arg!(X)(_argptr) here

     return "not implemented";
}

void writef(string fmt, ...) {
     // write(foo(fmt, ...)); // <-- doesn't work

     // _arguments gets passed as a single argument of type 
TypeInfo[]
     write(foo(fmt, _arguments));
}


https://dlang.org/spec/function.html#d_style_variadic_functions

John Chapman <johnch_atms hotmail.com> writes:

On Saturday, 30 December 2017 at 10:14:35 UTC, tipdbmp wrote:
             // how can I adjust _argptr?
             _argptr = ???

Try this:
   _argptr = *cast(va_list*)_argptr;