18 lines
1 KiB
Text
18 lines
1 KiB
Text
|
This is a copy-on-write proxy for frozen Ruby objects, so duplicating frozen
|
||
|
|
object is delayed until a method tries to change frozen object.
|
||
|
|
|
||
|
|
CowProxy classes for array, hash, string and struct are provided. Objects from
|
||
|
|
other classes will be proxied without copy-on-write, you have to create a
|
||
|
|
CowProxy class for them to enable copy-on-write. Also you have to create
|
||
|
|
CowProxy class for each object which have any getter method with arguments,
|
||
|
|
because default CowProxy won't wrap returned value. Immutable classes such as
|
||
|
|
Integer or TrueClass doesn't need copy-on-write proxy because they can't be
|
||
|
|
changed.
|
||
|
|
|
||
|
|
You can wrap every object in a proxy. Proxy will always send method calls to
|
||
|
|
wrapped object, and wrap returned value with a CowProxy class if method has no
|
||
|
|
argument, so a proxy will always return proxy objects for getters without
|
||
|
|
arguments. When a method tries to change a frozen object, if proxy has
|
||
|
|
copy-on-write enabled, it will duplicate frozen object and will send next method
|
||
|
|
calls to duplicated object, in other case an exception is raised.
|