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added non_copyable to second version of class_<Base, BaseWrap...

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[SVN r15978]
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Joel de Guzman
2002-10-24 21:12:37 +00:00
parent 8c2d6bb31b
commit da273519fd
1 changed files with 8 additions and 6 deletions
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doc/tutorial/doc/class_virtual_functions.html
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@@ -104,10 +104,11 @@ Python. To do that, it needs Base's copy constructor... which isn't
available, since Base is an abstract class.</p>
<p>
In Python, let us try to instantiate our <tt>Base</tt> class:</p>
<code><pre>
<code>
<pre>
<span class=special>&gt;&gt;&gt; </span><span class=identifier>base </span><span class=special>= </span><span class=identifier>Base</span><span class=special>()
</span><span class=identifier>AttributeError</span><span class=special>: </span><span class=special>...
</span></pre></code>
</span>RuntimeError: This class cannot be instantiated from Python</pre>
</code>
<p>
Why is it an error? <tt>Base</tt> is an abstract class. As such it is advisable
to define the Python wrapper with <tt>no_init</tt> as we have done above. Doing
@@ -167,11 +168,12 @@ And instead is implemented to return <tt>0</tt>, as shown above.</p>
</span></pre></code>
<p>
then, our Boost.Python wrapper:</p>
<code><pre>
<span class=identifier>class_</span><span class=special>&lt;</span><span class=identifier>Base</span><span class=special>, </span><span class=identifier>BaseWrap</span><span class=special>&gt;(</span><span class=string>&quot;Base&quot;</span><span class=special>)
<code>
<pre> <span class=identifier>class_</span><span class=special>&lt;</span><span class=identifier>Base</span><span class=special>, </span><span class=identifier>BaseWrap, boost::non_copyable</span><span class=special>&gt;(</span><span class=string>&quot;Base&quot;</span><span class=special>)
</span><span class=special>.</span><span class=identifier>def</span><span class=special>(</span><span class=string>&quot;f&quot;</span><span class=special>, </span><span class=special>&amp;</span><span class=identifier>BaseWrap</span><span class=special>::</span><span class=identifier>default_f</span><span class=special>)
</span><span class=special>;
</span></pre></code>
</span></pre>
</code>
<p>
Note that we are allowing <tt>Base</tt> objects to be instantiated this time,
unlike before where we specifically defined the <tt>class_&lt;Base&gt;</tt> with