On Monday, 7 December 2015 at 15:13:31 UTC, Meta wrote:
On Monday, 7 December 2015 at 11:40:45 UTC, Martin6265 wrote:
Hello,
I think nullable condition operator and null coalescending
operator should be a nice new features in D.
https://msdn.microsoft.com/library/dn986595.aspx
https://msdn.microsoft.com/library/ms173224.aspx
Same as operator `as`
https://msdn.microsoft.com/library/cscsdfbt.aspx
Why?
Is better to write
(variable as FooBar)?.callMethod();
than
auto var = cast(FooBar)variable;
if (var !is null)
var.callMethod();
or
auto x = (variable as FooBar)?.getRandomNumber() ?? 42;
As per Rumbu's link, D is powerful enough to implement this in
a library function, and have it optimize down to a set of
if-else statements.
But the syntax of it will be like calling template func, and its
not desirable.
The trick is in the simplicity of the pattern not only in
functionality.
Look, Im developing multiplatform GUI framework (based on .NET
conventions and Cocoa) & ID. I can make my custom version of D
(anyway, Ill distribute it as a one package product) but Im not
happy to make new, uncompatibile version.
