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Why if(__ctfe)?
Sep 16, 2014
Ilya Yaroshenko
Sep 16, 2014
Adam D. Ruppe
Sep 16, 2014
Rene Zwanenburg
Sep 16, 2014
Ilya Yaroshenko
September 16, 2014
Gravatar of Ilya YaroshenkoPosted by Ilya YaroshenkoReply
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Why not "static if(__ctfe)" ?
September 16, 2014
Gravatar of Adam D. RuppePosted by Adam D. Ruppe
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On Tuesday, 16 September 2014 at 13:11:50 UTC, Ilya Yaroshenko wrote:
> Why not "static if(__ctfe)" ?

ctfe is a runtime condition. The function has the same code when run at compile time, it is just being run in a different environment.
September 16, 2014
Gravatar of Rene ZwanenburgPosted by Rene Zwanenburg
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On Tuesday, 16 September 2014 at 13:17:28 UTC, Adam D. Ruppe wrote:
> On Tuesday, 16 September 2014 at 13:11:50 UTC, Ilya Yaroshenko wrote:
>> Why not "static if(__ctfe)" ?
>
> ctfe is a runtime condition. The function has the same code when run at compile time, it is just being run in a different environment.

Note that if(__ctfe) does not incur a runtime performance penalty. Even in debug builds will the branch be removed.
September 16, 2014
Gravatar of Ilya YaroshenkoPosted by Ilya Yaroshenko
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On Tuesday, 16 September 2014 at 13:28:17 UTC, Rene Zwanenburg wrote:
> On Tuesday, 16 September 2014 at 13:17:28 UTC, Adam D. Ruppe wrote:
>> On Tuesday, 16 September 2014 at 13:11:50 UTC, Ilya Yaroshenko wrote:
>>> Why not "static if(__ctfe)" ?
>>
>> ctfe is a runtime condition. The function has the same code when run at compile time, it is just being run in a different environment.
>
> Note that if(__ctfe) does not incur a runtime performance penalty. Even in debug builds will the branch be removed.

It is a kind of magic ;)