hashtest.d

void readAndMeasure(K)(size_t num, string fname) {
    auto data = cast(K[]) std.file.read(fname);
    enforce(data.length == num);
    auto h = new RHHash!(K,int);        
    measure("# " ~ typeof(h).stringof ~ ".make_histo", (){
        foreach(x; data)                 
            h[x]++;            
    });
    measure("# " ~ typeof(h).stringof ~ ".read_histo", (){
        int v = 0;
        foreach(x; data)
            v ^= h[x];
        writeln(v);
    });
    foreach(x; data[0..4]) writeln(x, " ", h[x]);
}

void measure(string caption, scope void delegate() f) {
    StopWatch sw;
    sw.start();
    f();
    sw.stop();
    writeln(caption, ": ", sw.peek.msecs, " ms");
}