Formatted output of range of tuples

[anonymous via Digitalmars-d-learn]

On Wednesday, 8 October 2014 at 21:21:47 UTC, antropod wrote:
> Hello!
>
> Consider this code:
>
> +++
> import std.stdio;
> import std.range;
> import std.algorithm;
>
> void printIndexedArray1(T, Range)(T[] source, Range indexes)
> {
> 	foreach(row; zip(indexes, source))
> 	{
> 		foreach(col; row) {
> 			write(col, " ");
> 		}
> 		writeln;
> 	}
> }
>
> void printIndexedArray2(T, Range)(T[] source, Range indexes)
> {
> 	writef("%(%(%s %)\n%)", zip(indexes, source));
> }
>
> void main()
> {
> 	uint[] data = [17, 30, 48, 140, 10, 01, 126, 138, 140, 3, 501];
> 	printIndexedArray1(data, sequence!"n");
> 	printIndexedArray2(data, sequence!"n");
>
> }
> +++
>
> Looks fairly straightforward. But, the second function causes 
> compilation error:
>
> std.format.FormatException at C:\D\dmd2\windows\bin\..\..\src\phobos\std\format.d(2
> 585): Expected '%s' format specifier for type 'Tuple!(uint, 
> uint)'
>
> Can you help me with that?

You can turn the tuples into ranges with `only`:

writef("%(%(%s %)\n%)", zip(indexes, source).map!(t =>
only(t.expand)));