• Andrei Alexandrescu (7/7) Aug 19 2016 Code: https://github.com/dlang/phobos/pull/4613
• =?UTF-8?B?THXDrXM=?= Marques (15/21) Aug 23 2016 BTW, there's something about which I've wondered before and which

Andrei Alexandrescu <SeeWebsiteForEmail erdani.org> writes:

Code: https://github.com/dlang/phobos/pull/4613

Docs: 
http://dtest.thecybershadow.net/artifact/website-e0b2b4609f1a8e4010ccbe9492ab4af3e3fdd2fb-ab9e77dd6d78136b1f0172e60f7b4f43/web/phobos-prerelease/std_experimental_checkedint.html

New policies implement NaN and saturation with relative ease. I think it 
shouldn't be too hard to add bounds checks in a future iteration. 
Anyhow, reviews would be very welcome.


Andrei

=?UTF-8?B?THXDrXM=?= Marques <luis luismarques.eu> writes:

On Friday, 19 August 2016 at 23:59:43 UTC, Andrei Alexandrescu 
wrote:
 Code: https://github.com/dlang/phobos/pull/4613

 Docs: 
 http://dtest.thecybershadow.net/artifact/website-e0b2b4609f1a8e4010ccbe9492ab4af3e3fdd2fb-ab9e77dd6d78136b1f0172e60f7b4f43/web/phobos-prerelease/std_experimental_checkedint.html

 New policies implement NaN and saturation with relative ease. I 
 think it shouldn't be too hard to add bounds checks in a future 
 iteration. Anyhow, reviews would be very welcome.

BTW, there's something about which I've wondered before and which 
applies here, so maybe you could clarify... If you have something 
like std.algorithm.filter, you pass the filtering predicate 
function by a template alias, so there's no overhead introduced 
there (in the passing itself). But here the "hook" is not one 
function but a series of functions. For convenience you use a 
struct to aggregate those related functions, instead of passing 
them individually through a series of template aliases. My 
question is, how well do the compilers optimize away this 0-byte 
/ 1-sizeof-byte, for this kind of use? Have there been situations 
where you had to use abstractions with worse ergonomics (e.g. 
template tuples, multiple template aliases, ...) to avoid the 
cost?