On 04/08/2017 03:11 AM, biocyberman wrote:
> On Saturday, 8 April 2017 at 10:02:01 UTC, Mike Parker wrote:
>>
>> I would expect if you implement it as a function the compiler will
>> inline it. You can always use the pragma(inline, true) [1] with
>> -inline to verify.
>>
>> [1] https://dlang.org/spec/pragma.html#inline
>
> Thanks for mentioning pragma. However, anyway to do it with mixin? It's
> so cool so I want to do more stuffs with it :)
You can mixin declarations with a template but I don't see how it can
help here. A string mixin would work but it's really ugly at the use site:
string roundUp(alias x)()
if (is (typeof(x) == uint)) {
import std.string : format;
return format(q{
--%1$s;
%1$s |= %1$s >> 1;
%1$s |= %1$s >> 2;
%1$s |= %1$s >> 4;
%1$s |= %1$s >> 8;
%1$s |= %1$s >> 16;
++%1$s;
}, x.stringof);
}
void main() {
uint i = 42;
mixin (roundUp!i); // <-- Ugly
assert(i == 64);
}
Compare that to the following natural syntax that a function provides:
void roundUp(ref uint x) {
// ...
}
void main() {
uint i = 42;
i.roundUp(); // <-- Natural
}
Ali
