projects / OpenSPARC-T2-SAM / blame
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| 55 | <H2><A NAME="SECTION005320000000000000000"></A><A NAME="weakref-example"></A> | |
| 56 | <BR> | |
| 57 | 3.3.2 Example | |
| 58 | </H2> | |
| 59 | ||
| 60 | <P> | |
| 61 | This simple example shows how an application can use objects IDs to | |
| 62 | retrieve objects that it has seen before. The IDs of the objects can | |
| 63 | then be used in other data structures without forcing the objects to | |
| 64 | remain alive, but the objects can still be retrieved by ID if they | |
| 65 | do. | |
| 66 | ||
| 67 | <P> | |
| 68 | <div class="verbatim"><pre> | |
| 69 | import weakref | |
| 70 | ||
| 71 | _id2obj_dict = weakref.WeakValueDictionary() | |
| 72 | ||
| 73 | def remember(obj): | |
| 74 | oid = id(obj) | |
| 75 | _id2obj_dict[oid] = obj | |
| 76 | return oid | |
| 77 | ||
| 78 | def id2obj(oid): | |
| 79 | return _id2obj_dict[oid] | |
| 80 | </pre></div> | |
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| 118 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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