How to write printf(...) like function

[Chris Sauls]

Cris wrote:
>     Where is what I'm trying to do is to make a print function that 
> outputs both to a console and to a file but I have get a std.format 
> runtime error. Any ideas how to do it?
> 
> 
>     void printTo(...)
>     {
>         char[] string;
> 
>         void putc(dchar c)
>         {
>             string ~= c;
>         }
> 
>         std.format.doFormat(&putc, _arguments, _argptr);
> 
>             printf(string ~= "\0"); //  std.c.stdio
>             file.printf(string);
>     }

The attached file is my own test and partial rewrite of your function, which essentially 
works.

-- Chris Nicholson-Sauls
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