Most performant way of converting int to string

[Andrew Chapman via Digitalmars-d-learn]

On Wednesday, 23 December 2015 at 11:46:37 UTC, Jakob Ovrum wrote:
> On Wednesday, 23 December 2015 at 11:21:32 UTC, Jakob Ovrum 
> wrote:
>> Dynamic memory allocation is expensive. If the string is 
>> short-lived, allocate it on the stack:
>
> See also std.conv.toChars[1] for stringifying lazily/on-demand.
>
> http://dlang.org/phobos/std_conv#toChars

Thanks Jakob!  I did try toChars but I couldn't quite figure out 
a syntax of calling it that the compiler was happy with.  From 
memory I tried things along the lines of:

string v = toChars!(16,char,LetterCase.lower)(i);

to convert an integer to Hex for example, but the compiler wasn't 
happy with it.  How would I convert an int to a string using this?

Cheers.