function-style wrapper for Tango.io.Stdout

Bill Baxter dnewsgroup at billbaxter.com
Thu Feb 14 05:30:39 PST 2008


Christopher Wright wrote:
> Bill Baxter wrote:
>> Since I'm not a big fan of the venerable St. Dout, I wrote these 
>> wrappers for Tango so you don't have to repeatedly invoke his name.
>>
>> --bb
>>
> 
> Tun palsat:
> /**********************************************************************
> 
>     Unformatted layout, with commas inserted between args.
>     Currently supports a maximum of 24 arguments
>     print() with no arguments always flushes the stream.
> 
> **********************************************************************/
> typeof(Stdout) print (...) {
>     static  char[] slice =  "{}, {}, {}, {}, {}, {}, {}, {}, "
>                          "{}, {}, {}, {}, {}, {}, {}, {}, "
>                          "{}, {}, {}, {}, {}, {}, {}, {}, ";
> 
>     assert (_arguments.length <= slice.length/4, "Print :: too many 
> arguments");
> 
>     if (_arguments.length is 0)
>         Stdout.flush;
>     else
>         Stdout.layout()(&Stdout.sink, _arguments, _argptr, slice[0 .. 
> _arguments.length * 4 - 2]);
> 
>     return Stdout;
> }
> 
> 
> You could do something like:
> if (_arguments.length < 24) {
>    // insert your code
> } else {
>    foreach (i, arg; _arguments) {
>       char[] fmt = (i + 1 == _arguments.length) ? "{0}" : "{0}, ";
>       Stdout.layout()(&Stdout.sink, [arg], _argptr, fmt);
>       _argptr += arg.tsize();
>    }
> }

The code is actually not mine but a slightly modified copy of the actual 
Tango print function.  What I'd _like_ to have my function look like is 
something like this:

typeof(Stdout) print(...) {
    return Stdout.vaprint(_arguments,_argptr);
}

However, Stdout.vaprint doesn't exist.

You make a good point about the implementation of Stdout.print, though.

--bb


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