projects / OpenSPARC-T2-DV / blame
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| 51 | ||
| 52 | <H2><A NAME="SECTION004260000000000000000"> | |
| 53 | 2.2.6 More Suggestions</A> | |
| 54 | </H2> | |
| 55 | ||
| 56 | <P> | |
| 57 | Remember that you can omit most of these functions, in which case you | |
| 58 | provide <code>0</code> as a value. There are type definitions for each of | |
| 59 | the functions you must provide. They are in <span class="file">object.h</span> in the | |
| 60 | Python include directory that comes with the source distribution of | |
| 61 | Python. | |
| 62 | ||
| 63 | <P> | |
| 64 | In order to learn how to implement any specific method for your new | |
| 65 | data type, do the following: Download and unpack the Python source | |
| 66 | distribution. Go the <span class="file">Objects</span> directory, then search the | |
| 67 | C source files for <code>tp_</code> plus the function you want (for | |
| 68 | example, <code>tp_print</code> or <code>tp_compare</code>). You will find | |
| 69 | examples of the function you want to implement. | |
| 70 | ||
| 71 | <P> | |
| 72 | When you need to verify that an object is an instance of the type | |
| 73 | you are implementing, use the <tt class="cfunction">PyObject_TypeCheck</tt> function. | |
| 74 | A sample of its use might be something like the following: | |
| 75 | ||
| 76 | <P> | |
| 77 | <div class="verbatim"><pre> | |
| 78 | if (! PyObject_TypeCheck(some_object, &MyType)) { | |
| 79 | PyErr_SetString(PyExc_TypeError, "arg #1 not a mything"); | |
| 80 | return NULL; | |
| 81 | } | |
| 82 | </pre></div> | |
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| 89 | <td class='online-navigation'><a rel="prev" title="2.2.5 Abstract Protocol Support" | |
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| 98 | <td align="center" width="100%">Extending and Embedding the Python Interpreter</td> | |
| 99 | <td class='online-navigation'><a rel="contents" title="Table of Contents" | |
| 100 | href="contents.html"><img src='../icons/contents.png' | |
| 101 | border='0' height='32' alt='Contents' width='32' /></A></td> | |
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| 105 | border='0' height='32' alt='' width='32' /></td> | |
| 106 | </tr></table> | |
| 107 | <div class='online-navigation'> | |
| 108 | <b class="navlabel">Previous:</b> | |
| 109 | <a class="sectref" rel="prev" href="node32.html">2.2.5 Abstract Protocol Support</A> | |
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| 111 | <a class="sectref" rel="parent" href="dnt-type-methods.html">2.2 Type Methods</A> | |
| 112 | <b class="navlabel">Next:</b> | |
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| 114 | </div> | |
| 115 | </div> | |
| 116 | <hr /> | |
| 117 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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| 121 | See <i><a href="about.html">About this document...</a></i> for information on suggesting changes. | |
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