struct opCast to void* and back

[Nrgyzer]

Robert Clipsham Wrote:

> On 11/04/10 12:47, Nrgyzer wrote:
> >> Try *cast(MyStruct*). In opCast you are returning&this, which is of
> >> type MyStruct* until it is implicitly cast to void*. In the writefln()
> >> you then cast it back to MyStruct*, and dereference it so you can use
> >> it. In your version you are trying to cast from a pointer to the struct
> >> to the actual struct, which is why it doesn't work.
> >
> > By using *cast(MyStruct*) I get the following message: "Error: 1invalid UTF-8 sequence"
> 
> I don't know how writefln() works in D1 (I presume that's what you're 
> using), but try the following:
> 
> writefln( "%s", (*cast(MyStruct*)temp).toString() );
> 
> I don't have a D1/Phobos compiler available to me to test, so I don't 
> know if that will help. You usually get that error when trying to print 
> /use strings with invalid UTF sequences in them, which looking at your 
> program, shouldn't be happening. If you're using code other than what 
> you're showing that could be it.

I want to do the following:

struct MyStruct {

	char[] structName;

	public char[] toString() {

		return structName;

	}
	
}

...

class MyClass {

	private static void function(void*) callBack;
	private static void* callBackValue;
	...
	static this() {
		MyStruct test = MyStruct();
		test.structName = "Struct name";
		callBack = &cb;
		callBackValue = &test;
	}
	...
	public void cb(void* value) {

		MyStruct temp = *((cast(MyStruct*) value));
		writefln(temp);

	}

}