Here a simple object for allowing dynamic typing in nim
Object is built on a variant object
It supports the following types: int8, int32, int64, float64, string, char, array of Object, custom instances (like structs)
This is a simple library to use and manage it by code. You can use it in structs, vars, etc..
Example
# Stack allocation
var s: Object = "Hello" # new object of type string
echo s # Hello, calling $
echo s.getType() # ocString, where oc means ObjectCode
let x: Object = s of string # true
s = x # changing type at runtime
if x:
echo "Implicit conversion to bool"Another example
type
Person = object
name: string
age: uint8
var tmp = Person()
var me: Object = newObject(tmp)
var other = me
other.name = "?"
echo "Recovering name: ", (me as Person).name
assert me != otherUsing it in types
type
Node = object
kind: uint8
value: Object # Allowing Node recursion, normally illegal
DynamicType = object
node: Object
var dyn = DynamicType(node: null) # null = newObject(ocNull), declared in the module
var node = Node(value: null)
dyn.node = Node(value: newObject(node)) # type recursion