Re: Default method implementations in interfaces?
On 10/23/15 10:58 AM, pineapple wrote: Is it possible to have default method implementations in interfaces à la Java in D? Or some equivalent that allows multiple inheritance without a bunch of identical copypasted method bodies? If the idea is to have an implementation that *doesn't* get overridden, you can have final methods in an interface. I know it's not what you asked for, but sometimes people may ask for something they know not realizing that something else may satisfy their needs :) -Steve
Re: Default method implementations in interfaces?
On Friday, 23 October 2015 at 15:07:05 UTC, Alex Parrill wrote: Use template mixins: http://dlang.org/template-mixin.html On Friday, 23 October 2015 at 15:08:30 UTC, Adam D. Ruppe wrote: Use a mixin template together with your interface. Awesome, thanks! No way, though, to unite declaration and implementation? Feels a little too much like endless header files to me.
Re: Default method implementations in interfaces?
On Friday, 23 October 2015 at 14:58:43 UTC, pineapple wrote: Is it possible to have default method implementations in interfaces à la Java in D? Or some equivalent that allows multiple inheritance without a bunch of identical copypasted method bodies? Use a mixin template together with your interface. Here's an example from my book: http://arsdnet.net/dcode/book/chapter_06/09/multiple_inheritance.d https://www.packtpub.com/application-development/d-cookbook Notice that there's default implementations for each interface, you mix them in to get it all and can override individual names in the class too.
Re: Default method implementations in interfaces?
On Friday, 23 October 2015 at 14:58:43 UTC, pineapple wrote:
Is it possible to have default method implementations in
interfaces à la Java in D? Or some equivalent that allows
multiple inheritance without a bunch of identical copypasted
method bodies?
Use template mixins: http://dlang.org/template-mixin.html
interface MyInterface {
void foo();
int bar();
}
mixin template MyInterfaceDefaultImpl() {
void foo() {
// put code here
}
int bar() {
// put code here
}
}
class MyClass : MyInterface {
mixin MyInterfaceDefaultImpl!(); // Similar to inserting the
body of `MyInterfaceDefaultImpl` at this point.
mixin MyOtherInterfaceDefaultImpl!(); // Can put any amount
of them here.
}
Default method implementations in interfaces?
Is it possible to have default method implementations in interfaces à la Java in D? Or some equivalent that allows multiple inheritance without a bunch of identical copypasted method bodies?
