Review of std.signal

[Jacob Carlborg]

On 2014-01-23 23:51, Martin Nowak wrote:

> Wouldn't it be possible to find out whether the delegate context ptr
> is actually an object? Not sure how to do it safely though and
> Interfaces slightly differ.
>
> ```d
> import std.stdio;
>
> class Foo
> {
>      void method() {}
> }
>
> void main()
> {
>      auto foo = new Foo;
>      auto dg = &foo.method;
>      // It's a class delegate!!!
>      writeln(cast(void*)foo.classinfo.__vptr, " ",
> ***cast(void****)dg.ptr, " ", (new ClassInfo).__vptr);
>      assert(***cast(void****)dg.ptr is (new ClassInfo).__vptr);
> }
> ```

Why don't you just cast the delegate context pointer to Object? Like this:

auto result = cast(Object) dg.ptr;

If "result" is not null the context pointer points to an object. 
Although this won't handled interfaces. I consider it a bug that an 
interface cannot be casted to Object.

-- 
/Jacob Carlborg