On Friday, 10 October 2014 at 17:43:13 UTC, Kapps wrote:
On Friday, 10 October 2014 at 17:00:01 UTC, bitwise wrote:
Hey, I am trying to put together a basic reflection system,
but I've run into a problem. I'm not sure if this is a bug or
not.
I am trying to store method information about a class. So
basically, I am using Traits to go through all members of the
class, and then trying to create delegates to each member.
Then, at runtime, the function will be dynamically invoked by
changing the ".ptr" property of the delegate, and calling it.
These are the errors I am getting from these 3 lines from the
code below:
//del.ptr = null;
-Error: CTFE internal error: unsupported assignment del.ptr =
null (TestD)
//del.funcptr = mixin("&T." ~ member);
-Error: CTFE internal error: unsupported assignment
del.funcptr = & someFunction (TestD)
-Also, why has 'T' been removed after mixin?
//del.funcptr = mixin("&SomeClass." ~ member);
-Error: CTFE internal error: unsupported assignment
del.funcptr = & someFunction (TestD)
Without looking too much at your code, the internal error seems
to definitely imply a bug, I recommend reporting it on the
issue tracker.
Also, I made a Reflection module as well, you may find some of
the code useful (such as getting methods at compile-time and
invoking at run-time):
https://shardsoft.com/stash/projects/SHARD/repos/shardtools/browse/source/ShardTools/Reflection.d?until=45ded3019f3f05d7b68e5746d34da1de7433ccf6#1299
(links to a specific commit, after that I started trying to
unify runtime and compile-time reflection into one API which
gave me some troubles). It can get a bit complicated depending
on what your needs are, as you would need to deal with vtables
and interfaces depending on what you want to support. My
implementation definitely isn't perfect, but works for my usage.
Thanks for the help!
I tried a workaround, which was to store the function pointer
and then assign it to the delegate at runtime, at which point the
compiler told me that the function pointer was not a compile time
constant. So that may have been the root of the problem.
Finally, I was able to get my code working by accessing the
vtable directly like your code.
My code is posted here:
https://github.com/bitwise-github/D-Reflection
