(I hope this formatting comes out right)
>And in fact, that is what it does :)>
>void main()
>{
> import std.stdio;
> auto x = typeid(int);
> writefln("%s, %s", x.init.length, x.init.ptr);
>}
>
>output:
>
>0, null
Actually, I think it is only half right. Shouldn't x.init.length return 4?
>Doing some research, I found this tidbit in history:
>
>https://issues.dlang.org/show_bug.cgi?id=2990
>
>The only basic types that have init() defined are the ones that have non-zero
>initializers. I suppose we have 3 options:
>
>1. Revise the documentation so it says “if this returns null with zero length,
>it means the type is initialized with all zeros, and use tsize to get the size
>of the type”
>2. Add the appropriate overrides to all the druntime types.
>3. We could make TypeInfo.init return (cast(void *)null)[0..tsize] by default,
>defaulting all inits to a sane value.
>
>My personal preference is for 3, since it adds no new functions, and will fix
>any omissions that we haven’t discovered or that would be added in the future.
I'm inclined to agree with you. I think I'll put this on my todo list for pull
request when the time is right. I think now is not it. Perhaps after 2.068 is
released.
>Clearly, though, this identifies how unused that function really is :)
>
>I recall now, the compiler only sets up static data inside the typeinfo for
>things like classes and structs, and the TypeInfo_Struct init() function reads
>that when determining what to return.
>
>Everything else is defined in druntime.
Thanks Steve, You've been very helpful. Things are starting to come together
for me now.
_______________________________________________
dmd-internals mailing list
[email protected]
http://lists.puremagic.com/mailman/listinfo/dmd-internals
