Dlang Features You Would Like To Share
bluecat via Digitalmars-d
digitalmars-d at puremagic.com
Thu Apr 13 05:55:22 PDT 2017
On Thursday, 13 April 2017 at 11:16:46 UTC, crimaniak wrote:
> On Thursday, 13 April 2017 at 05:51:27 UTC, Dukc wrote:
>> auto use(alias F, T)(T t){return F(t);}
>>
>> void main()
>> { import std.stdio;
>> foreach(i; 1 .. 11)
>> { foreach(j; 1 .. 11) write((i * j).use!(x => x*x), " ");
>> writeln;
>> }
>> }
>>
>> This way, you can avoid writing long expressions twice with
>> UFCS.
> If fact you don't need any template to do this. Try the next:
>
> foreach(i; 1 .. 11)
> { foreach(j; 1 .. 11) write((x => x*x)(i * j), " ");
> writeln;
> }
Thats a good one, wrote that down for next time. With that I'll
share another one I read about that I thought was really cool:
import std.stdio;
import std.functional: memoize;
ulong fib(ulong n) {
alias mfib = memoize!(fib);
return n < 2 ? 1 : mfib(n-2) + mfib(n-1);
}
void main() {
foreach (x; 1..45) {
writefln("%s", x.fib);
}
}
What this does is make calculating the recursive fibonacci
sequence much faster. I don't know too much about the technique,
but having it in my optimizations.txt is always a good thing. Now
that I think of it, I wonder if there is a page on this website
that lists common optimization techniques.
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