Named template constraints

[Steven Schveighoffer via Digitalmars-d-learn]

On Tue, 22 Apr 2014 11:15:14 -0400, monarch_dodra <monarchdodra at gmail.com>  
wrote:

> On Tuesday, 22 April 2014 at 15:06:34 UTC, Steven Schveighoffer wrote:
>> Note, is the r2 = R.init needed? Not sure.
>
> Yes: It R2 has no default init, or is an immutable, then that line will  
> fail to compile.

I don't believe it's possible to have no 'init'.

I think the reason it says '= R.init' is for ranges that have @disable  
this().

Also, an immutable can be initialized that way:

immutable int[] = int[].init;

Of course, it wouldn't pass the rest of isInputRange.

-Steve