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Add Object.same(_,_) to access built-in equality even for classes that may override ==.

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Had to add a new metaclass for Object since it now has its own static method so we
can't just use Class as its metaclass. (We don't want *every* class to have a same(_,_)
static method.)
This commit is contained in:
Bob Nystrom
2015-05-01 07:55:28 -07:00
parent a907c143c8
commit fcf4197139
6 changed files with 116 additions and 31 deletions
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21
doc/site/core/object.markdown
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@ -1,6 +1,21 @@
^title Object Class
^category core
## Static Methods
## **same**(obj1, obj2)
Returns `true` if *obj1* and *obj2* are the same. For [value
types](../values.html), this returns `true` if the objects have equivalent
state. In other words, numbers, strings, booleans, and ranges compare by value.
For all other objects, this returns `true` only if *obj1* and *obj2* refer to
the exact same object in memory.
This is similar to the built in `==` operator in Object except that this cannot
be overriden. It allows you to reliably access the built-in equality semantics
even on user-defined classes.
## Methods
### **!** operator
@ -9,9 +24,9 @@ Returns `false`, since most objects are considered [true](control-flow.html#trut
### **==**(other) and **!=**(other) operators
Compares two objects using built-in equality. This compares numbers by value,
and all other objects are compared by identity—two objects are equal only
if they are the exact same object.
Compares two objects using built-in equality. This compares [value
types](../values.html) by value, and all other objects are compared by
identity—two objects are equal only if they are the exact same object.
### **toString**