calgeneric.nim

import tables
 
 
type
  ContextValue[T] = object
    value: ref T
  MyString = object of TObject
    value: string
  ExtendedObj = object of TObject
    name: string
 
 
# Create context value
var x_ctxVal: ContextValue[ExtendedObj]
new(x_ctxVal.value)
x_ctxVal.value.name = "foo"
var y_ctxVal: ContextValue[MyString]
new(y_ctxVal.value)
y_ctxVal.value.value = "foo"
 
# Create context
var Context = initTable[string, ContextValue[TObject]]()
 
# Adds value to context
Context["x"] = cast[ContextValue[TObject]](x_ctxVal)
Context["y"] = cast[ContextValue[TObject]](y_ctxVal) # Error: type mismatch: got (TTable[string, ContextValue[ExtendedObj]], string, ContextValue[string])
 
# Prints context value name
echo(cast[ContextValue[ExtendedObj]](Context["x"]).value.name)
echo(cast[ContextValue[MyString]](Context["y"]).value.value)