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<title>Boost.Python - &lt;boost/python/data_members.hpp&gt;</title>
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
"header">
<tr>
<td valign="top" width="300">
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
<td valign="top">
<h1 align="center">Boost.Python</h1>
<h2 align="center">Header &lt;boost/python/data_members.hpp&gt;</h2>
</table>
<hr>
<h2>Contents</h2>
<dl class="page-index">
<dt><a href="#introduction">Introduction</a>
<dt><a href="#functions">Functions</a>
<dd>
<dl class="page-index">
<dt><a href="#make_getter-spec">make_getter</a>
<dt><a href="#make_setter-spec">make_setter</a>
</dl>
<dt><a href="#examples">Example</a>
</dl>
<hr>
<h2><a name="introduction"></a>Introduction</h2>
<p><code><a href="#make_getter-spec">make_getter</a>()</code> and
<code><a href="#make_setter-spec">make_setter</a>()</code> are
the functions used internally by <code>class_&lt;&gt;::<a href=
"class.html#class_-spec-modifiers">def_readonly</a></code> and
<code>class_&lt;&gt;::<a href=
"class.html#class_-spec-modifiers">def_readwrite</a></code> to
produce Python callable objects which wrap C++ data members.
<h2><a name="functions"></a>Functions</h2>
<pre>
<a name="make_getter-spec">template &lt;class C, class D&gt;</a>
objects::function* make_getter(D C::*pm);
template &lt;class C, class D, class Policies&gt;
objects::function* make_getter(D C::*pm, Policies const&amp; policies);
</pre>
<dl class="function-semantics">
<dt><b>Requires:</b> <code>Policies</code> is a model of <a
href="CallPolicies.html">CallPolicies</a>.
<dt><b>Effects:</b> Creates a Python callable object which
accepts a single argument that can be converted
<code>from_python</code> to <code>C*</code>, and returns the
corresponding member <code>D</code> member of the <code>C</code>
object, converted <code>to_python</code>. If
<code>policies</code> is supplied, it will be applied to the
function as described <a href=
"CallPolicies.html">here</a>.
<dt><b>Returns:</b> A pointer convertible to <code>PyObject*</code> which
refers to the new Python callable object.
</dl>
<pre>
<a name="make_setter-spec">template &lt;class C, class D&gt;</a>
objects::function* make_setter(D C::*pm);
template &lt;class C, class D, class Policies&gt;
objects::function* make_setter(D C::*pm, Policies const&amp; policies);
</pre>
<dl class="function*-semantics">
<dt><b>Requires:</b> <code>Policies</code> is a model of <a
href="CallPolicies.html">CallPolicies</a>.
<dt><b>Effects:</b> Creates a Python callable object which, when
called from Python, expects two arguments which can be converted
<code>from_python</code> to <code>C*</code> and
<code>D&nbsp;const&amp;</code>, respectively, and sets the
corresponding <code>D</code> member of the <code>C</code>
object. If <code>policies</code> is supplied, it will be applied
to the function as described <a
href="CallPolicies.html">here</a>.
<dt><b>Returns:</b> A pointer convertible to
<code>PyObject*</code> which refers to the new Python callable
object.
</dl>
<h2><a name="examples"></a>Example</h2>
<p>The code below uses make_getter and make_setter to expose a
data member as functions:
<pre>
#include &lt;boost/python/data_members.hpp&gt;
#include &lt;boost/python/module.hpp&gt;
#include &lt;boost/python/class.hpp&gt;
struct X
{
X(int x) : y(x) {}
int y;
};
using namespace boost::python;
BOOST_PYTHON_MODULE_INIT(data_members_example)
{
module("data_members_example")
.add(
class_&lt;X&gt;(&quot;X&quot;)
.def_init(args&lt;int&gt;())
.def(&quot;get&quot;, make_getter(&amp;X::y))
.def(&quot;set&quot;, make_setter(&amp;X::y))
)
;
}
</pre>
It can be used this way in Python:
<pre>
&gt;&gt;&gt; from data_members_example import *
&gt;&gt;&gt; x = X(1)
&gt;&gt;&gt; x.get()
1
&gt;&gt;&gt; x.set(2)
&gt;&gt;&gt; x.get()
2
</pre>
<p>
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
8 May 2002 <!--webbot bot="Timestamp" endspan i-checksum="39359" -->
<p><i>&copy; Copyright <a href="../../../../people/dave_abrahams.htm">Dave
Abrahams</a> 2002. All Rights Reserved.</i>