abstract class
sys::Obj
Obj is the root class of all classes.
Slots
- compareSource
-
Return -1, 0, or 1 if this object is less than, equal to, or greater than the specified object. This method may also be accessed via the < <= <=> >= and > shortcut operators. If not overridden the default implementation compares the toStr() representations.
- echoSource
-
Write
x.toStr
to standard output. Ifx
is null then print "null". - equalsSource
-
virtual Bool equals(Obj? that)
Compare this object to the specified for equality. This method may be accessed via the == and != shortcut operators. If not overridden the default implementation compares for reference equality using the === operator. If this method is overridden, then hash() must also be overridden such that any two objects which return true for equals() must return the same value for hash(). This method must accept
null
and return false. - hashSource
-
virtual Int hash()
Return a unique hashcode for this object. If a class overrides hash() then it must ensure if equals() returns true for any two objects then they have same hash code.
- isImmutableSource
-
Bool isImmutable()
Return if this Obj is immutable and safe to share between threads:
- an instance of a const class
- a non-dynamic Type instance
- the result of
List.toImmutable
orMap.toImmutable
- a Func object may or may not be (see
sys::Func
for details). - other instances are assumed mutable and return false.
- makeSource
-
new make()
Obj constructor for subclasses.
- toStrSource
-
virtual Str toStr()
Return a string representation of this object.
- trapSource
-
virtual Obj? trap(Str name, Obj?[]? args)
Trap a dynamic call for handling. Dynamic calls are invoked with the -> shortcut operator:
a->x a.trap("x", [,]) a->x = b a.trap("x", [b]) a->x(b) a.trap("x", [b]) a->x(b, c) a.trap("x", [b, c])
The default implementation provided by Obj attempts to use reflection. If name maps to a method, it is invoked with the specified arguments. If name maps to a field and args.size is zero, get the field. If name maps to a field and args.size is one, set the field and return args[0]. Otherwise throw UnknownSlotErr.
- typeSource
-
virtual Type type()
Get the Type instance used to represent this object's type. This method is never overridden directly.