[Issue 12272] and(), or(), xor() to compose predicates

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https://d.puremagic.com/issues/show_bug.cgi?id=12272



--- Comment #4 from yebblies <yebblies at gmail.com> 2014-03-01 03:00:09 EST ---
(In reply to comment #3)
>
> With those templates you can define a new predicate in point-free style
> (std.functional.compose!() does something similar for arbitrary functions):

IIRC std.functional.compose predates lambdas

> 
> alias two = and!(startsWithJ, fourLetterLong);
> 
> With lambdas it becomes similar to:
> 
> enum two = (in string s) => s.startsWithJ && s.fourLetterLong;

I expect we will soon be able to do this:

alias two = s => s.startsWithJ && s.fourLetterLong;

> 
> So are you suggesting to close down this ER because it's not useful enough?

I don't think this is worth adding to phobos.  Of course what you do with this
ER is up to you.

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