struct vs class benchmark (was Re: Give struct the status it deserves)

[Hasan Aljudy]

Heh, this is so flawed.

it's got nothing to do with classes vs. structs.

The benchmark is designed so that the struct version runs faster than 
the class version.

change the class version to:

	Point p = new Point();
	for (uint i = 0; i < n; ++i)
	{		
		Point.count += p.x;
		// delete p;
	}

and the struct version to:

	for (uint i = 0; i < n; ++i)
	{
		Point * p = new Point();
		Point.count += p.x;
	}

These programs don't logically do anything different. However, the class 
version now runs much much faster than the struct version.

on my machine:
 >class
100000000
operation took 0 m 0.25 s

 >struct
100000000
operation took 0 m 15.265 s


Try to come up with a more realistic example, and optamize both 
versions. This way, you can prove that it's the class vs. struct issue 
and not an optimization issue.

Hong wrote:
> Ok, even people are telling me that class is not slower, I have decided to make
> a benchmark to test them out. Here they are,
> 
> Version using struct
> http://members.iinet.net.au/~honglee/benchmark/benchmarkstruct.d
> 
> Version using class
> http://members.iinet.net.au/~honglee/benchmark/benchmarkclass.d
> 
> On my computer, the struct version runs 300 times faster than the class version.
> Interestingly, deleting the object explicitly in the class version actually
> slowed the program even further.
> 
> The difference seems real.
> 
> In article <e07506$1ss2$1 at digitaldaemon.com>, Hasan Aljudy says...
> 
>>What's wrong with classes?!
>>
>>Classes won't make your code slow.
>>
> 
> 
>