On Monday, 14 March 2016 at 08:04:18 UTC, deadalnix wrote:
Right now, I'm repeating the following pattern many times :
range.map!(x => cast(Foo) x).filter!(x => x !is null)
Which is kind of annoying. Could we get something in phobos to
do this ?
BTW, .NET has an extension method called OfType<T> that does the
same thing:
https://msdn.microsoft.com/library/bb360913(v=vs.100).aspx
which is different from Cast<T>, which throws an exception if an
element can't be converted:
https://msdn.microsoft.com/library/bb341406(v=vs.100).aspx
How do you want to handle this? With two separate methods as in
.NET, or with a template parameter?
Maybe something like this:
/// Returns a range that lazily iterates over
/// the elements in `source` and converts each
/// of them to type `T`.
///
/// If `throwOnConvError` is false, elements
/// that can't be converted will be skipped.
auto ofType
(T, bool throwOnConvError = true, Range)
(Range source)
if (isInputRange!Range)
