module struct_calls;

import std.perf;
import std.stdio;

const COUNT = 100_000u;

struct Foo
{
    uint dummy;

    void call()
    {
        //this.dummy = arg;
    }
}

class FooClass
{
    uint dummy;

    final void call()
    {
        //this.dummy = arg;
    }
}

void Foo_call(Foo* _this)
{
    //_this.dummy = arg;
}

void main()
{
    Foo x;

    scope perf = new HighPerformanceCounter();

    perf.start();
    for( uint i=0; i<COUNT; i++ )
        x.call();
    perf.stop();

    // count1: x.call()
    auto count1 = perf.periodCount();

    perf.start();
    for( uint i=0; i<COUNT; i++ )
        Foo_call(&x);
    perf.stop();

    // count2: Foo_call(&x)
    auto count2 = perf.periodCount();

    scope y = new FooClass();

    perf.start();
    for( uint i=0; i<COUNT; i++ )
        y.call();
    perf.stop();

    // count3: y.call()
    auto count3 = perf.periodCount();

    writefln("%d / %d = %f -- %d / %d = %f",
            count1, count2, cast(real)count1 / cast(real)count2,
            count3, count2, cast(real)count3 / cast(real)count2);
}