On Sat, Feb 23, 2013 at 06:42:43PM +0000, Russel Winder wrote:
> On Sat, 2013-02-23 at 22:24 +0400, Dmitry Olshansky wrote:
> […]
> > It doesn't help *reading* this verbosity.
>
> Very, very true.
>
> Sadly, D has some arcane bits that make it equally difficult to read D
> code. For example:
>
> example.filter!isLongEnough().array()
>
> Why ! in one place and . in the others, it is all just calling a method
> on something.
[...]
One of the worst offenders in D is the is-expression. Not only are the
meaning of the arguments mysterious and manifold, they also have
non-obvious intents:
void myGenericFunction(T,U,V)(T t, U u, V v)
if (is(T) && is(typeof(T.a)) &&
is(U : int) && is (V _ : W[X], W, X) &&
is(typeof(T.expectedMember)) &&
is(typeof(T.expectedMember())) &&
is(typeof(T.expectedMember() : V))
// ^ Completely opaque unless you stare at it
// long enough.
)
{
// Lisp fans would love the level of parentheses in this
// next line:
static if (isInputRange!(typeof(T.expectedMember())))
dotDotDotMagic(t,u,v);
else
moreDotDotDotMagic(t,u,v);
}
T
--
"Holy war is an oxymoron." -- Lazarus Long
