Function opcode1Add

txscript/opcode.go:1430–1438

opcode1Add treats the top item on the data stack as an integer and replaces it with its incremented value (plus 1). Stack transformation: [... x1 x2] -> [... x1 x2+1]

(op *opcode, data []byte, vm *Engine)

//
// Stack transformation: [... x1 x2] -> [... x1 x2+1]
func opcode1Add(op *opcode, data []byte, vm *Engine) error {
	m, err := vm.dstack.PopInt()
	if err != nil {
		return err
	}

	vm.dstack.PushInt(m + 1)
	return nil
}

// opcode1Sub treats the top item on the data stack as an integer and replaces
// it with its decremented value (minus 1).