Machine is now a generic type

creature.go

@@ -1,24 +1,31 @@
 package creature
 
+// Word is a type constraint defining possible word types for the Machine.
+type Word interface {
+	int8  | int16  | int32  | int64  |
+	uint8 | uint16 | uint32 | uint64 |
+	int   | uint
+}
+
 // Machine is a stack machine. It contains an array of integers as its program
 // data, and provides methods to run this program data, as well as interact with
 // it.
-type Machine struct {
+type Machine [WORD Word] struct {
 	// Program is not modified by the machine, and can be freely set before
 	// the machine is started.
-	Program []int
+	Program []WORD
 
-	stack     []int
+	stack     []WORD
-	block     []int
+	block     []WORD
-	counter   int
+	counter   WORD
-	pointer   int
+	pointer   WORD
-	functions map[int]MachineFunction
+	functions map[WORD]MachineFunction[WORD]
 }
 
 // MachineFunction is a function that can extend the functionality of the stack
 // machine. It is passed a pointer to the machine that is calling it, and the
 // machine will halt execution if true is returned.
-type MachineFunction func(machine *Machine) (stop bool)
+type MachineFunction [WORD Word] func(machine *Machine[WORD]) (stop bool)
 
 // All supported opcodes
 const (
@@ -68,7 +75,7 @@ func (err Error) Error() (description string) {
 
 // Reset resets the stack of the  machine. This should be called before Execute,
 // since Execute does not reset the stack.
-func (machine *Machine) Reset() {
+func (machine *Machine[WORD]) Reset() {
 	machine.stack = nil
 	machine.pointer = 0
 }