Re: Functional vs simple code

[Timon Gehr]

On 10/03/2012 12:11 AM, Timon Gehr wrote:

...

$ cat ixidbench.d
module main;
import std.stdio, std.algorithm, std.range, std.datetime;

enum MAX = 10_000_000_000UL;

void main() {
     StopWatch sw;
     sw.start;

     auto sum1 = MAX.iota.map!(x => x * x).reduce!"a + b";

     sw.stop;
     sw.peek.msecs.writeln("msecs");
     sum1.writeln;
     sw.reset;
     sw.start;

     ulong sum2 = 0;
     foreach(i;0..MAX)
         sum2 += i * i;

     sw.stop;
     sw.peek.msecs.writeln("msecs");

     sum2.writeln;
}
$ ldmd2 -O -release -inline ixidbench.d -ofixidbench
$ ./ixidbench
6528msecs
7032546979563742720
7518msecs
7032546979563742720

$ gdmd -O -release -inline ixidbench.d -ofixidbench
$ ./ixidbench
11250msecs
7032546979563742720
11233msecs
7032546979563742720