Class Declaration (Gforth Manual)

Instance variables
```
var ( size –  ) oof “var”
```
Create an instance variable
Object pointers
```
ptr ( –  ) oof “ptr”
```
Create an instance pointer
```
asptr ( class –  ) oof “asptr”
```
Create an alias to an instance pointer, cast to another class.
Instance defers
```
defer ( –  ) oof “defer”
```
Create an instance defer
Method selectors
```
early ( –  ) oof “early”
```
Create a method selector for early binding.
```
method ( –  ) oof “method”
```
Create a method selector.
Class-wide variables
```
static ( –  ) oof “static”
```
Create a class-wide cell-sized variable.
End declaration
```
how: ( –  ) oof “how-to”
```
End declaration, start implementation
```
class; ( –  ) oof “end-class”
```
End class declaration or implementation