root/trunk/iterators/big.d

import std.stdio;

import iterators;

class Numbers {
    int n;
    this (int n0) {
        n = n0;
    }

    int iter() {
        for (int i = 0; i < n; i++) {
            yield(i);
        }
        return 0;
    }
    mixin mainiter!(int, iter);
}

int main(char[][] args) {
    const int TESTS = 40;

    const int n = 1_000_000;

    {
        auto t = new Timer();
        for (int j = 0; j < TESTS; j++) {
            long sum = 0;
            for (int i = 0; i < n; i++) {
                sum += i*j;
            }
            //writefln(sum);
        }
    }

    auto s = new Numbers(n);

    {
        auto t = new Timer();
        for (int j = 0; j < TESTS; j++) {
            long sum = 0;
            foreach (int i; s) {
                sum += i*j;
            }
            //writefln(sum);
        }
    }

    return 0;
}


import std.date;

class Timer {
    static d_time getCount(){return getUTCtime();}
    d_time starttime;
    this() { starttime = getCount(); }
    ~this() { writefln("elapsed time = %s", (getCount() - starttime)/1000.0); }
}