337 lines
9.6 KiB
HTML
337 lines
9.6 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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<!-- Software License, Version 1.0. (See accompanying -->
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<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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<html>
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<meta name="generator" content=
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"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
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<link rel="stylesheet" type="text/css" href="../boost.css">
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<title>Boost.Python - <boost/python/handle.hpp></title>
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p.c4 {font-style: italic}
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h1.c1 {text-align: center}
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</style>
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</head>
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<body>
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<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
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"header">
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<tr>
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<td valign="top" width="300">
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<h3><a href="../../../../index.htm"><img height="86" width="277"
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alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
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</td>
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<td valign="top">
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<h1 class="c1"><a href="../index.html">Boost.Python</a></h1>
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<h2 class="c2">Header <boost/python/handle.hpp></h2>
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</td>
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</tr>
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</table>
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<hr>
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<h2>Contents</h2>
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<dl class="page-index">
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<dt><a href="#introduction">Introduction</a></dt>
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<dt><a href="#classes">Classes</a></dt>
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<dd>
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<dl class="page-index">
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<dt><a href="#handle-spec">Class template
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<code>handle</code></a></dt>
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<dd>
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<dl class="page-index">
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<dt><a href="#handle-spec-synopsis">Class <code>handle</code>
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synopsis</a></dt>
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<dt><a href="#handle-spec-ctors">Class <code>handle</code>
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constructors and destructor</a></dt>
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<dt><a href="#handle-spec-modifiers">Class <code>handle</code>
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modifier functions</a></dt>
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<dt><a href="#handle-spec-observers">Class <code>handle</code>
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observer functions</a></dt>
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</dl>
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</dd>
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</dl>
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</dd>
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<dt><a href="#functions">Functions</a></dt>
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<dd>
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<dl class="page-index">
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<dt><a href="#borrowed-spec"><code>borrowed</code></a></dt>
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<dt><a href="#allow_null-spec"><code>allow_null</code></a></dt>
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</dl>
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</dd>
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</dl>
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<hr>
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<h2><a name="introduction"></a>Introduction</h2>
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<p><code><boost/python/handle.hpp></code> provides
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<code>class template handle</code>, a smart pointer for
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managing reference-counted Python objects.</p>
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<h2><a name="classes"></a>Classes</h2>
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<h3><a name="handle-spec"></a>Class template <code>handle</code></h3>
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<p><code>handle</code> is a smart pointer to a Python object type; it
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holds a pointer of type <code>T*</code>, where T is its template
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parameter. <code>T</code> must be either a type derived from
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<code>PyObject</code> or a <a href="definitions.html#POD">POD</a> type
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whose initial <code>sizeof(PyObject)</code> bytes are layout-compatible
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with <code>PyObject</code>. Use <code>handle<></code> at the
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boundary between the Python/'C' API and high-level code; prefer <code><a
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href="object.html#object-spec">object</a></code> for a generalized
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interface to Python objects.</p>
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<p><a name="upcast"></a>In this document, the term "upcast" refers to an
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operation which converts a pointer <code>Y*</code> to a base class
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pointer <code>T*</code> via <code>static_cast<T*></code> if
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<code>Y</code> is derived from <code>T</code>, or via C-style cast
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<code>(T*)</code> if it is not. However, in the latter case the "upcast"
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is ill-formed if the initial <code>sizeof(PyObject)</code> bytes of
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<code>Y</code> are not layout-compatible with <code>PyObject</code>.</p>
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<h4><a name="handle-spec-synopsis"></a>Class template handle
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synopsis</h4>
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<pre>
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namespace boost { namespace python
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{
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template <class T>
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class handle
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{
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typedef <i>unspecified-member-function-pointer</i> bool_type;
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public: // types
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typedef T element_type;
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public: // member functions
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~handle();
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template <class Y>
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explicit handle(detail::borrowed<null_ok<Y> >* p);
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template <class Y>
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explicit handle(null_ok<detail::borrowed<Y> >* p);
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template <class Y>
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explicit handle(detail::borrowed<Y>* p);
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template <class Y>
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explicit handle(null_ok<Y>* p);
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template <class Y>
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explicit handle(Y* p);
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handle();
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handle& operator=(handle const& r);
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template<typename Y>
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handle& operator=(handle<Y> const & r); // never throws
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template <typename Y>
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handle(handle<Y> const& r);
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handle(handle const& r);
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T* operator-> () const;
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T& operator* () const;
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T* get() const;
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void reset();
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T* release();
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operator bool_type() const; // never throws
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private:
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T* m_p;
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};
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template <class T> struct null_ok;
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namespace detail { template <class T> struct borrowed; }
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}}
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</pre>
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<h4><a name="handle-spec-ctors">Class <code>handle</code> constructors
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and destructor</a></h4>
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<pre>
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virtual ~handle();
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</pre>
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<dl class="function-semantics">
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<dt><b>Effects:</b>
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<code>Py_XDECREF(</code><i>upcast</i><code><PyObject*>(m_p))</code></dt>
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</dl>
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<pre>
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template <class Y>
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explicit handle(detail::borrowed<null_ok<Y> >* p);
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</pre>
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<dl class="function-semantics">
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<dt><b>Effects:</b>
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<code>Py_XINCREF(</code><i>upcast</i><code><PyObject*>(p));
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m_p = </code><i>upcast</i><code><T*>(p);</code></dt>
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</dl>
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<pre>
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template <class Y>
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explicit handle(null_ok<detail::borrowed<Y> >* p);
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</pre>
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<dl class="function-semantics">
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<dt><b>Effects:</b>
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<code>Py_XINCREF(</code><i>upcast</i><code><PyObject*>(p));
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m_p = </code><i>upcast</i><code><T*>(p);</code></dt>
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</dl>
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<pre>
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template <class Y>
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explicit handle(detail::borrowed<Y>* p);
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</pre>
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<dl class="function-semantics">
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<dt><b>Effects:</b>
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<code>Py_XINCREF(</code><i>upcast</i><code><PyObject*>(p));
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m_p = </code><i>upcast</i><code><T*>(<a href=
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"errors.html#expect_non_null-spec">expect_non_null</a>(p));</code></dt>
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</dl>
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<pre>
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template <class Y>
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explicit handle(null_ok<Y>* p);
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</pre>
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<dl class="function-semantics">
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<dt><b>Effects:</b>
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<code>m_p = </code><i>upcast</i><code><T*>(p);</code></dt>
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</dl>
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<pre>
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template <class Y>
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explicit handle(Y* p);
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</pre>
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<dl class="function-semantics">
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<dt><b>Effects:</b>
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<code>m_p = </code><i>upcast</i><code><T*>(<a href=
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"errors.html#expect_non_null-spec">expect_non_null</a>(p));</code></dt>
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</dl>
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<pre>
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handle();
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</pre>
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<dl class="function-semantics">
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<dt><b>Effects:</b> <code>m_p = 0;</code></dt>
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</dl>
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<pre>
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template <typename Y>
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handle(handle<Y> const& r);
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handle(handle const& r);
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</pre>
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<dl class="function-semantics">
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<dt><b>Effects:</b>
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<code>m_p = r.m_p; Py_XINCREF(</code><i>upcast</i><code><PyObject*>(m_p));</code></dt>
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</dl>
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<h4><a name="handle-spec-modifiers">Class <code>handle</code>
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modifiers</a></h4>
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<pre>
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handle& operator=(handle const& r);
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template<typename Y>
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handle& operator=(handle<Y> const & r); // never throws
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</pre>
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<dl class="function-semantics">
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<dt><b>Effects:</b>
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<code>Py_XINCREF(</code><i>upcast</i><code><PyObject*>(r.m_p)); Py_XDECREF(</code><i>
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upcast</i><code><PyObject*>(m_p)); m_p = r.m_p;</code></dt>
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</dl>
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<pre>
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T* release();
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</pre>
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<dl class="function-semantics">
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<dt><b>Effects:</b> <code>T* x = m_p; m_p = 0;return
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x;</code></dt>
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</dl>
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<pre>
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void reset();
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</pre>
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<dl class="function-semantics">
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<dt><b>Effects:</b>
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<code>*this = handle<T>();</code></dt>
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</dl>
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<h4><a name="handle-spec-observers">Class <code>handle</code>
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observers</a></h4>
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<pre>
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T* operator-> () const;
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T* get() const;
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</pre>
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<dl class="function-semantics">
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<dt><b>Returns:</b> <code>m_p;</code></dt>
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</dl>
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<pre>
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T& operator* () const;
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</pre>
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<dl class="function-semantics">
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<dt><b>Returns:</b> <code>*m_p;</code></dt>
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</dl>
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<pre>
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operator bool_type() const; // never throws
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</pre>
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<dl class="function-semantics">
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<dt><b>Returns:</b> 0 if <code>m_p == 0</code>, a pointer
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convertible to <code>true</code> otherwise.</dt>
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</dl>
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<h2><a name="functions"></a>Functions</h2>
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<h3><a name="borrowed-spec"></a><code>borrowed</code></h3>
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<pre>
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template <class T>
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detail::borrowed<T>* borrowed(T* p)
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{
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return (detail::borrowed<T>*)p;
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}
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</pre>
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<h3><a name="allow_null-spec"></a><code>allow_null</code></h3>
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<pre>
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template <class T>
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null_ok<T>* allow_null(T* p)
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{
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return (null_ok<T>*)p;
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}
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</pre>
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<p>Revised
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<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
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13 November, 2002
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<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
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</p>
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<p class="c4">© Copyright <a href=
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"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002
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.</p>
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</body>
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</html>
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