On Thursday, 2 April 2020 at 12:41:28 UTC, Steven Schveighoffer
wrote:
On 4/2/20 8:26 AM, Bastiaan Veelo wrote:
On Thursday, 1 November 2018 at 08:50:38 UTC, Bastiaan Veelo
wrote:
On Thursday, 1 November 2018 at 00:01:04 UTC, Stefan Koch
wrote:
On Wednesday, 31 October 2018 at 23:14:08 UTC, Bastiaan
Veelo wrote:
Currently, BitArray is not usable at compile time, so you
cannot do
```
enum e = BitArray([1, 1, 1, 0]);
```
This gives
/dlang/dmd/linux/bin64/../../src/phobos/std/bitmanip.d(1190): Error: `bts`
cannot be interpreted at compile time, because it has no available source code
Hm... I thought there was precedent for providing fallback
implementations for intrinsics. That is, you define the
function, which is only used if the intrinsic is not available.
I can't remember where I saw this. But you could try this by
simply implementing the bitops in core.bitop, and see if they
are used outside ctfe.
There are a bunch of functions implemented with `if (!__ctfe)`.
DMD and LDC are smart enough to elide `if(false/true)` control
flow completely even in debug code, so there is no penalty to
using `if (!__ctfe)`.
See for example:
https://github.com/ldc-developers/druntime/blob/ldc/src/core/bitop.d#L85
-Johan
