On Sun, 26 Apr 2009 21:44:31 +0400, dsimcha <[email protected]> wrote:
I've been thinking a little more about ranges, etc. and it would be nice
to
have a template for isIterable(T) that simply tells whether an object
can be
iterated over with foreach, without caring how this iteration works
(ranges,
opApply, builtin array/AA). I have some use cases where I'm writing very
generic functionality and all I need is the lowest common denominator
that,
given an object T, the following will compile, and to know what type elem
would be:
foreach(elem; T.init) {}
This functionality does not require any of the more advanced features of
ranges, just iteration. Is there any good way to write a template for
this?
Since foreach is a statement, is(typeof()) and __traits(compiles) are
out.
// Not tested
template isIterable(T)
{
static if (is(typeof({foreach(elem; T.init) {}})) {
const bool isIterable = true;
} else {
const bool isIterable = false;
}
}
