Assign any event kind to a single templatized function ?

ag0aep6g via Digitalmars-d-learn digitalmars-d-learn at puremagic.com
Mon Sep 5 07:00:04 PDT 2016


On 09/05/2016 03:44 PM, Basile B. wrote:
> °°°°°°°°°°°°°°°°°°°°°°°°°°°°°°
> module runnable;
>
> import std.stdio;
>
> struct Foo
> {
>     void delegate(int) event1;
>     void delegate(int,int) event2;
>     void delegate(int,ref int) event3;
> }
>
> struct Handler
> {
>     void handle(A...)(A a){writeln(a);}
>     void handleref(A...)(/*auto ref*/ A a){writeln(a);}
> }
>
> void main(string[] args)
> {
>     import std.traits;
>     Foo foo;
>     Handler handler;
>     foo.event1 = &handler.handle!(Parameters!(foo.event1));
>     foo.event2 = &handler.handle!(Parameters!(foo.event2));
>     foo.event3 = &handler.handleref!(Parameters!(foo.event2)); // ?
> }
> °°°°°°°°°°°°°°°°°°°°°°°°°°°°°°

You can pass the delegate type itself by alias. Then Parameters carries 
over the ref. Not sure if that's well-defined or if it just happens to work.


     void handlef(F)(Parameters!F a){writeln(a);}
...
     foo.event3 = &handler.handlef!(typeof(foo.event3));


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