On Wednesday, 15 March 2017 at 18:52:16 UTC, H. S. Teoh wrote:
On Wed, Mar 15, 2017 at 03:59:46PM +0000, Stefan Koch via
Digitalmars-d wrote: [...]
Unsupported Features include :
[...]
- Floating point.
[...]
- unions
[...]
What are the chances / what's the expected timeframe of unions
being implemented?
Support for unions in CTFE is a MAJOR milestone in making
std.math CTFE-able, which IMO will take D compile-time
capabilities to a whole new level, because it will greatly
expand the scope of what's computable at compile-time in terms
of floating-point constants, lookup tables, etc.. Imagine, for
example, a precomputed table of values transcendental functions
with some given resolution, for fast runtime lookups.
(Of course, this also requires floating-point support in CTFE.
But that should be relatively easy(?). As long as both the host
and target architectures support the same set of IEEE
floating-point types, which is probably the case for our
currently-supported platforms.)
T
I am not sure.
The CTFE-ABI is different from the ABI at runtime.
So more adventurous uses of unions are likely to be surprising.
As for floating point, I have yet to find a solution that will
work for more numerically inclined people.
dmds constant folder apparently does some funky things in that
domain as well.
I do not anticipate to have any of the fp stuff working before
dconf.
Currently Unicode correct string-handling is more important.
After that comes class support.
FP is the very last thing on my list and will like take a lot of
time.
