Explicitly Instantiated Function Template won't work as Array

Denis Koroskin 2korden at gmail.com
Mon Oct 27 15:40:32 PDT 2008


On Mon, 27 Oct 2008 11:47:39 +0300, HOSOKAWA Kenchi <hskwk at inter7.jp>  
wrote:

> 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 ]);
>
>

Oh, that's easy: array should be the first parameter in a function, it  
won't work as a pseudo-member function otherwise.



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