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clean up v1 flotsam

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[SVN r15856]
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Dave Abrahams
2002-10-10 13:05:52 +00:00
parent a8d37ebc4a
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
"http://www.w3.org/TR/REC-html40/strict.dtd">
<title>
A Simple Example
</title>
<div>
<h1>
<img width="277" height="86" id="_x0000_i1025" src="../../../c++boost.gif" alt=
"c++boost.gif (8819 bytes)">
</h1>
<h1>
A Simple Example
</h1>
<p>
Suppose we have the following C++ API which we want to expose in
Python:
<blockquote>
<pre>
#include &lt;string&gt;
namespace { // Avoid cluttering the global namespace.
// A couple of simple C++ functions that we want to expose to Python.
std::string greet() { return "hello, world"; }
int square(int number) { return number * number; }
}
</pre>
</blockquote>
<p>
Here is the C++ code for a python module called <tt>getting_started1</tt>
which exposes the API.
<blockquote>
<pre>
#include &lt;boost/python/class_builder.hpp&gt;
namespace python = boost::python;
BOOST_PYTHON_MODULE_INIT(getting_started1)
{
// Create an object representing this extension module.
python::module_builder this_module("getting_started1");
// Add regular functions to the module.
this_module.def(greet, "greet");
this_module.def(square, "square");
}
</pre>
</blockquote>
<p>
That's it! If we build this shared library and put it on our <code>
PYTHONPATH</code> we can now access our C++ functions from
Python.
<blockquote>
<pre>
&gt;&gt;&gt; import getting_started1
&gt;&gt;&gt; print getting_started1.greet()
hello, world
&gt;&gt;&gt; number = 11
&gt;&gt;&gt; print number, '*', number, '=', getting_started1.square(number)
11 * 11 = 121
</pre>
<p>
Next: <a href="exporting_classes.html">Exporting Classes</a>
Previous: <a href="comparisons.html">Comparisons with other systems</a> Up:
<a href="index.html">Top</a>
<p>
&copy; Copyright David Abrahams 2000. Permission to copy, use, modify,
sell and distribute this document is granted provided this copyright
notice appears in all copies. This document is provided "as is" without
express or implied warranty, and with no claim as to its suitability
for any purpose.
<p>
Updated: Mar 6, 2000
</div>