• a11e99z (12/12) Sep 02 2019 I need function that do one thing if GC enabled and other when
• Kagamin (1/1) Sep 03 2019 __traits(compiles,new int)
• a11e99z (11/12) Sep 03 2019 it doesn't work
• Kagamin (6/6) Sep 05 2019 At least
• a11e99z (11/19) Sep 05 2019 u know that u haven't gc in blocks @nogc.

a11e99z <black80 bk.ru> writes:

I need function that do one thing if GC enabled and other when 
disabled.

I filled issue about it, but maybe u can show some trick:
how to determine in code that "nogc" is enabled?

=======================================================
LDC supports command option:
-nogc = Do not allow code that generates implicit garbage 
collector calls.

but I cannot find corresponding predefined version in 
https://dlang.org/spec/version.html#predefined-versions

need to add version LDC_nogc or D_nogc.
the one should be enabled for -betterC too.

Kagamin <spam here.lot> writes:

__traits(compiles,new int)

a11e99z <black80 bk.ru> writes:

On Tuesday, 3 September 2019 at 08:18:13 UTC, Kagamin wrote:
 __traits(compiles,new int)

it doesn't work
https://run.dlang.io/is/zdD2cU

2 version of runtime exists:
- at compiletime when compiler/ctfe can use all features.
- and app runtime when constraints can exist such as no GC, no 
exceptions..

what exactly __traits(compiles) checks "can this code compile 
without any conditions?" ?
maybe need another trait "rtcompiles" to take into account 
current options/conditions?

Kagamin <spam here.lot> writes:

At least

void f()  nogc
{
     static assert(__traits(compiles,new int));
}

fails

a11e99z <black80 bk.ru> writes:

On Thursday, 5 September 2019 at 08:02:15 UTC, Kagamin wrote:
 At least
 void f()  nogc
 {
     static assert(__traits(compiles,new int));
 }
 fails

u know that u haven't gc in blocks  nogc.

try to run
 static assert( __traits( compiles, new int));
 extern(C) int main() { return 0; }

for DMD/LDC:-betterC or LDC:-nogc

__traits( compiles, new int) is true.
but shouldn't cuz when u use "new int" in code u will get error - 
module compiled for noGC.
(probably we have issue here with __traits)
and I don't need error, I am trying to find workaround, so I need 
some flag/version to choose right code for version with GC and 
another.