Reset class member variables

[Sean Kelly]

mandel wrote:
> Hi,
> 
> I have some big classes with lots of member variables
> that need to be reset to theire initial value.
> Therefore I thought about a more reliable way to
> accomplish this, because it's hard to keep track
> of variables I have added.
> It also looks bloated to assign all values manually.
> 
> class Foo
> {
> 	uint x;
> 	char[] name = "world";
> //problematic:
> 	const uint y;
> 	char[1024] buffer;
> 	
> 	void reset()
> 	{
> 		scope tmp = new typeof(this);
> 		foreach(i, x;  tmp.tupleof)
> 		{
> 			this.tupleof[i] = x;
> 		}
> 	}
> }
> 
> The problem is that I have to avoid
> to try to set const values and static arrays.
> 
> How can this be done?

It's a bit horrifying, but this should work:

class Foo
{
     uint x;
     char[] name = "world";
//problematic:
     const uint y;
     char[1024] buffer;

     void reset()
     {
         (cast(byte*) this)[0 .. this.classinfo.init.length] =
             this.classinfo.init[0 .. $];
     }
}


Sean