On Tuesday, 21 April 2015 at 19:42:42 UTC, anonymous wrote:
On Tuesday, 21 April 2015 at 19:17:56 UTC, kevin wrote:
On Tuesday, 21 April 2015 at 19:13:34 UTC, Meta wrote:
On Tuesday, 21 April 2015 at 19:11:43 UTC, John Colvin wrote:
On Tuesday, 21 April 2015 at 19:06:39 UTC, kevin wrote:
enum bool isInputRange = is(typeof(
(inout int = 0)
{
R r = R.init; // can define a range object
if (r.empty) {} // can test for empty
r.popFront(); // can invoke popFront()
auto h = r.front; // can get the front of the range
}));
[...]
Also, what is the purpose of typeof? I would have expected a
simple is() to work just fine.
(In this most simple form,) `is` evaluates to true if the
argument is a valid type. A function/delegate literal isn't a
type.
If you passed the lambda expression itself to `is`, the result
would always be false. As it is, the result is true when the
lambda expression compiles (so it has a valid type).
More about the IsExpression:
http://dlang.org/expression.html#IsExpression
That makes sense. It seems to me that D has very... special but
effective syntax. I'm having a hard time remembering all the
keywords and expression forms (especially of IsExpression) but
it's definitely a vast improvement over C++'s half baked pile of
whatever. Thanks for the help, everyone.
