Explicitly Instantiated Function Template won't work as Array

[HOSOKAWA Kenchi]

Moritz Warning Wrote:

> On Sat, 25 Oct 2008 02:19:05 -0400, HOSOKAWA Kenchi wrote:
> 
> > import std.algorithm;
> > [0,1,2,3].reverse!(int[]);  // fails
> > [0,1,2,3].reverse;  // works
> > 
> > 
> > Please let me know the former expression fails due to the language
> > limitation or not.
> > 
> > 
> > thanks,
> 
> http://www.digitalmars.com/d/2.0/phobos/std_algorithm.html#reverse
> 
> reverse is no template.


std.algorithm.reverse is a Function template.

definition of std.algorithm.reverse is :
void reverse(alias iterSwap = .iterSwap, Range)(Range r);
thus it is a template,  according to "Function Templates" in
http://www.digitalmars.com/d/2.0/template.html

please note these codes are working (and failing) in dmd 2.020

int[] arr = [ 1, 2, 3 ];
reverse!(std.algorithm.iterSwap, int[])(arr); // works.
arr.reverse!(std.algorithm.iterSwap, int[]);   // fails
assert(arr == [ 3, 2, 1 ]);