This code snippet is from:
http://dlang.org/phobos/std_parallelism.html
---
import std.algorithm, std.parallelism, std.range;
void main() {
// Parallel reduce can be combined with
// std.algorithm.map to interesting effect.
// The following example (thanks to Russel Winder)
// calculates pi by quadrature using
// std.algorithm.map and TaskPool.reduce.
// getTerm is evaluated in parallel as needed by
// TaskPool.reduce.
//
// Timings on an Athlon 64 X2 dual core machine:
//
// TaskPool.reduce: 12.170 s
// std.algorithm.reduce: 24.065 s
immutable n = 1_000_000_000;
immutable delta = 1.0 / n;
real getTerm(int i)
{
immutable x = ( i - 0.5 ) * delta;
return delta / ( 1.0 + x * x ) ;
}
immutable pi = 4.0 * taskPool.reduce!"a + b"(
std.algorithm.map!getTerm(iota(n))
);
}
dmd compiler gives error:
/usr/include/dmd/phobos/std/parallelism.d(2624): Error: function
std.parallelism.TaskPool.reduce!"a +
b".reduce!(MapResult!(getTerm, Result)).reduce cannot get frame
pointer to D main
Is there way to compile it?
-Ish
