123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363 |
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
- <title>boost/python/handle.hpp</title>
- <link rel="stylesheet" href="../../boostbook.css" type="text/css">
- <meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
- <link rel="home" href="../index.html" title="Boost.Python Reference Manual">
- <link rel="up" href="../utility_and_infrastructure.html" title="Chapter 7. Utility and Infrastructure">
- <link rel="prev" href="boost_python_pointee_hpp.html" title="boost/python/pointee.hpp">
- <link rel="next" href="boost_python_type_id_hpp.html" title="boost/python/type_id.hpp">
- </head>
- <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
- <table cellpadding="2" width="100%"><tr><td valign="top"><img alt="" width="" height="" src="../../images/boost.png"></td></tr></table>
- <hr>
- <div class="spirit-nav">
- <a accesskey="p" href="boost_python_pointee_hpp.html"><img src="../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../utility_and_infrastructure.html"><img src="../../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="boost_python_type_id_hpp.html"><img src="../../images/next.png" alt="Next"></a>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h2 class="title" style="clear: both">
- <a name="utility_and_infrastructure.boost_python_handle_hpp"></a><a class="link" href="boost_python_handle_hpp.html" title="boost/python/handle.hpp">boost/python/handle.hpp</a>
- </h2></div></div></div>
- <div class="toc"><dl class="toc">
- <dt><span class="section"><a href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.introduction">Introduction</a></span></dt>
- <dt><span class="section"><a href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.class_template_handle">Class
- template <code class="computeroutput"><span class="identifier">handle</span></code></a></span></dt>
- <dt><span class="section"><a href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.function_borrowed">Function
- <code class="computeroutput"><span class="identifier">borrowed</span></code></a></span></dt>
- <dt><span class="section"><a href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.function_allow_null">Function
- <code class="computeroutput"><span class="identifier">allow_null</span></code></a></span></dt>
- </dl></div>
- <div class="section">
- <div class="titlepage"><div><div><h3 class="title">
- <a name="utility_and_infrastructure.boost_python_handle_hpp.introduction"></a><a class="link" href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.introduction" title="Introduction">Introduction</a>
- </h3></div></div></div>
- <p>
- <boost/python/handle.hpp> provides class template <code class="computeroutput"><span class="identifier">handle</span></code>,
- a smart pointer for managing reference-counted Python objects.
- </p>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h3 class="title">
- <a name="utility_and_infrastructure.boost_python_handle_hpp.class_template_handle"></a><a class="link" href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.class_template_handle" title="Class template handle">Class
- template <code class="computeroutput"><span class="identifier">handle</span></code></a>
- </h3></div></div></div>
- <div class="toc"><dl class="toc">
- <dt><span class="section"><a href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.class_template_handle.class_template_handle_constructo">Class
- template <code class="computeroutput"><span class="identifier">handle</span></code> constructors
- and destructor</a></span></dt>
- <dt><span class="section"><a href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.class_template_handle.class_template_handle_modifiers">Class
- template <code class="computeroutput"><span class="identifier">handle</span></code> modifiers</a></span></dt>
- <dt><span class="section"><a href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.class_template_handle.class_template_handle_observers">Class
- template <code class="computeroutput"><span class="identifier">handle</span></code> observers</a></span></dt>
- </dl></div>
- <p>
- <code class="computeroutput"><span class="identifier">handle</span></code> is a smart pointer
- to a Python object type; it holds a pointer of type <code class="computeroutput"><span class="identifier">T</span><span class="special">*</span></code>, where <code class="computeroutput"><span class="identifier">T</span></code>
- is its template parameter. T must be either a type derived from <code class="computeroutput"><span class="identifier">PyObject</span></code> or a <a class="link" href="../glossary.html#pod">POD</a>
- type whose initial <code class="computeroutput"><span class="keyword">sizeof</span><span class="special">(</span><span class="identifier">PyObject</span><span class="special">)</span></code> bytes are layout-compatible with <code class="computeroutput"><span class="identifier">PyObject</span></code>. Use <code class="computeroutput"><span class="identifier">handle</span><span class="special"><></span></code> at the boundary between the Python/'C'
- API and high-level code; prefer object for a generalized interface to Python
- objects.
- </p>
- <p>
- In this document, the term "upcast" refers to an operation which
- converts a pointer <code class="computeroutput"><span class="identifier">Y</span><span class="special">*</span></code>
- to a base class <code class="computeroutput"><span class="identifier">pointer</span> <span class="identifier">T</span><span class="special">*</span></code> via
- <code class="computeroutput"><span class="keyword">static_cast</span><span class="special"><</span><span class="identifier">T</span><span class="special">*></span></code>
- if <code class="computeroutput"><span class="identifier">Y</span></code> is derived from <code class="computeroutput"><span class="identifier">T</span></code>, or via C-style cast (<code class="computeroutput"><span class="identifier">T</span><span class="special">*</span></code>) if
- it is not. However, in the latter case the "upcast" is ill-formed
- if the initial <code class="computeroutput"><span class="keyword">sizeof</span><span class="special">(</span><span class="identifier">PyObject</span><span class="special">)</span></code>
- bytes of <code class="computeroutput"><span class="identifier">Y</span></code> are not layout-compatible
- with <code class="computeroutput"><span class="identifier">PyObject</span></code>.
- </p>
- <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">python</span>
- <span class="special">{</span>
- <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span>
- <span class="keyword">class</span> <span class="identifier">handle</span>
- <span class="special">{</span>
- <span class="keyword">typedef</span> <span class="identifier">unspecified</span><span class="special">-</span><span class="identifier">member</span><span class="special">-</span><span class="identifier">function</span><span class="special">-</span><span class="identifier">pointer</span> <span class="identifier">bool_type</span><span class="special">;</span>
- <span class="keyword">public</span><span class="special">:</span> <span class="comment">// types</span>
- <span class="keyword">typedef</span> <span class="identifier">T</span> <span class="identifier">element_type</span><span class="special">;</span>
- <span class="keyword">public</span><span class="special">:</span> <span class="comment">// member functions</span>
- <span class="special">~</span><span class="identifier">handle</span><span class="special">();</span>
- <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="keyword">explicit</span> <span class="identifier">handle</span><span class="special">(</span><span class="identifier">detail</span><span class="special">::</span><span class="identifier">borrowed</span><span class="special"><</span><span class="identifier">null_ok</span><span class="special"><</span><span class="identifier">Y</span><span class="special">></span> <span class="special">>*</span> <span class="identifier">p</span><span class="special">);</span>
- <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="keyword">explicit</span> <span class="identifier">handle</span><span class="special">(</span><span class="identifier">null_ok</span><span class="special"><</span><span class="identifier">detail</span><span class="special">::</span><span class="identifier">borrowed</span><span class="special"><</span><span class="identifier">Y</span><span class="special">></span> <span class="special">>*</span> <span class="identifier">p</span><span class="special">);</span>
- <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="keyword">explicit</span> <span class="identifier">handle</span><span class="special">(</span><span class="identifier">detail</span><span class="special">::</span><span class="identifier">borrowed</span><span class="special"><</span><span class="identifier">Y</span><span class="special">>*</span> <span class="identifier">p</span><span class="special">);</span>
- <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="keyword">explicit</span> <span class="identifier">handle</span><span class="special">(</span><span class="identifier">null_ok</span><span class="special"><</span><span class="identifier">Y</span><span class="special">>*</span> <span class="identifier">p</span><span class="special">);</span>
- <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="keyword">explicit</span> <span class="identifier">handle</span><span class="special">(</span><span class="identifier">Y</span><span class="special">*</span> <span class="identifier">p</span><span class="special">);</span>
- <span class="identifier">handle</span><span class="special">();</span>
- <span class="identifier">handle</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span><span class="identifier">handle</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">r</span><span class="special">);</span>
- <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="identifier">handle</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span><span class="identifier">handle</span><span class="special"><</span><span class="identifier">Y</span><span class="special">></span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">r</span><span class="special">);</span> <span class="comment">// never throws</span>
- <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="identifier">handle</span><span class="special">(</span><span class="identifier">handle</span><span class="special"><</span><span class="identifier">Y</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">r</span><span class="special">);</span>
- <span class="identifier">handle</span><span class="special">(</span><span class="identifier">handle</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">r</span><span class="special">);</span>
- <span class="identifier">T</span><span class="special">*</span> <span class="keyword">operator</span><span class="special">-></span> <span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
- <span class="identifier">T</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">*</span> <span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
- <span class="identifier">T</span><span class="special">*</span> <span class="identifier">get</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
- <span class="keyword">void</span> <span class="identifier">reset</span><span class="special">();</span>
- <span class="identifier">T</span><span class="special">*</span> <span class="identifier">release</span><span class="special">();</span>
- <span class="keyword">operator</span> <span class="identifier">bool_type</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span> <span class="comment">// never throws</span>
- <span class="keyword">private</span><span class="special">:</span>
- <span class="identifier">T</span><span class="special">*</span> <span class="identifier">m_p</span><span class="special">;</span>
- <span class="special">};</span>
- <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">null_ok</span><span class="special">;</span>
- <span class="keyword">namespace</span> <span class="identifier">detail</span> <span class="special">{</span> <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">borrowed</span><span class="special">;</span> <span class="special">}</span>
- <span class="special">}}</span>
- </pre>
- <div class="section">
- <div class="titlepage"><div><div><h4 class="title">
- <a name="utility_and_infrastructure.boost_python_handle_hpp.class_template_handle.class_template_handle_constructo"></a><a class="link" href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.class_template_handle.class_template_handle_constructo" title="Class template handle constructors and destructor">Class
- template <code class="computeroutput"><span class="identifier">handle</span></code> constructors
- and destructor</a>
- </h4></div></div></div>
- <pre class="programlisting"><span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">handle</span><span class="special">();</span></pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Effects</span></dt>
- <dd><p>
- <code class="computeroutput"><span class="identifier">Py_XDECREF</span><span class="special">(</span><span class="identifier">upcast</span><span class="special"><</span><span class="identifier">PyObject</span><span class="special">*>(</span><span class="identifier">m_p</span><span class="special">))</span></code>
- </p></dd>
- </dl>
- </div>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="keyword">explicit</span> <span class="identifier">handle</span><span class="special">(</span><span class="identifier">detail</span><span class="special">::</span><span class="identifier">borrowed</span><span class="special"><</span><span class="identifier">null_ok</span><span class="special"><</span><span class="identifier">Y</span><span class="special">></span> <span class="special">>*</span> <span class="identifier">p</span><span class="special">);</span>
- </pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Effects</span></dt>
- <dd><pre class="programlisting"><span class="identifier">Py_XINCREF</span><span class="special">(</span><span class="identifier">upcast</span><span class="special"><</span><span class="identifier">PyObject</span><span class="special">*>(</span><span class="identifier">p</span><span class="special">));</span>
- <span class="identifier">m_p</span> <span class="special">=</span> <span class="identifier">upcast</span><span class="special"><</span><span class="identifier">T</span><span class="special">*>(</span><span class="identifier">p</span><span class="special">);</span>
- </pre></dd>
- </dl>
- </div>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="keyword">explicit</span> <span class="identifier">handle</span><span class="special">(</span><span class="identifier">null_ok</span><span class="special"><</span><span class="identifier">detail</span><span class="special">::</span><span class="identifier">borrowed</span><span class="special"><</span><span class="identifier">Y</span><span class="special">></span> <span class="special">>*</span> <span class="identifier">p</span><span class="special">);</span></pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Effects</span></dt>
- <dd><pre class="programlisting"><span class="identifier">Py_XINCREF</span><span class="special">(</span><span class="identifier">upcast</span><span class="special"><</span><span class="identifier">PyObject</span><span class="special">*>(</span><span class="identifier">p</span><span class="special">));</span>
- <span class="identifier">m_p</span> <span class="special">=</span> <span class="identifier">upcast</span><span class="special"><</span><span class="identifier">T</span><span class="special">*>(</span><span class="identifier">p</span><span class="special">);</span>
- </pre></dd>
- </dl>
- </div>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="keyword">explicit</span> <span class="identifier">handle</span><span class="special">(</span><span class="identifier">detail</span><span class="special">::</span><span class="identifier">borrowed</span><span class="special"><</span><span class="identifier">Y</span><span class="special">>*</span> <span class="identifier">p</span><span class="special">);</span></pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Effects</span></dt>
- <dd><pre class="programlisting"><span class="identifier">Py_XINCREF</span><span class="special">(</span><span class="identifier">upcast</span><span class="special"><</span><span class="identifier">PyObject</span><span class="special">*>(</span><span class="identifier">p</span><span class="special">));</span>
- <span class="identifier">m_p</span> <span class="special">=</span> <span class="identifier">upcast</span><span class="special"><</span><span class="identifier">T</span><span class="special">*>(</span><span class="identifier">expect_non_null</span><span class="special">(</span><span class="identifier">p</span><span class="special">));</span>
- </pre></dd>
- </dl>
- </div>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="keyword">explicit</span> <span class="identifier">handle</span><span class="special">(</span><span class="identifier">null_ok</span><span class="special"><</span><span class="identifier">Y</span><span class="special">>*</span> <span class="identifier">p</span><span class="special">);</span>
- </pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Effects</span></dt>
- <dd><p>
- <code class="computeroutput"><span class="identifier">m_p</span> <span class="special">=</span>
- <span class="identifier">upcast</span><span class="special"><</span><span class="identifier">T</span><span class="special">*>(</span><span class="identifier">p</span><span class="special">);</span></code>
- </p></dd>
- </dl>
- </div>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="keyword">explicit</span> <span class="identifier">handle</span><span class="special">(</span><span class="identifier">Y</span><span class="special">*</span> <span class="identifier">p</span><span class="special">);</span>
- </pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Effects</span></dt>
- <dd><p>
- <code class="computeroutput"><span class="identifier">m_p</span> <span class="special">=</span>
- <span class="identifier">upcast</span><span class="special"><</span><span class="identifier">T</span><span class="special">*>(</span><span class="identifier">expect_non_null</span><span class="special">(</span><span class="identifier">p</span><span class="special">));</span></code>
- </p></dd>
- </dl>
- </div>
- <pre class="programlisting"><span class="identifier">handle</span><span class="special">();</span>
- </pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Effects</span></dt>
- <dd><p>
- <code class="computeroutput"><span class="identifier">m_p</span> <span class="special">=</span>
- <span class="number">0</span><span class="special">;</span></code>
- </p></dd>
- </dl>
- </div>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="identifier">handle</span><span class="special">(</span><span class="identifier">handle</span><span class="special"><</span><span class="identifier">Y</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">r</span><span class="special">);</span>
- <span class="identifier">handle</span><span class="special">(</span><span class="identifier">handle</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">r</span><span class="special">);</span>
- </pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Effects</span></dt>
- <dd><p>
- m_p = r.m_p; Py_XINCREF(upcast<PyObject*>(m_p));
- </p></dd>
- </dl>
- </div>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h4 class="title">
- <a name="utility_and_infrastructure.boost_python_handle_hpp.class_template_handle.class_template_handle_modifiers"></a><a class="link" href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.class_template_handle.class_template_handle_modifiers" title="Class template handle modifiers">Class
- template <code class="computeroutput"><span class="identifier">handle</span></code> modifiers</a>
- </h4></div></div></div>
- <pre class="programlisting"><span class="identifier">handle</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span><span class="identifier">handle</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">r</span><span class="special">);</span>
- <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Y</span><span class="special">></span>
- <span class="identifier">handle</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span><span class="identifier">handle</span><span class="special"><</span><span class="identifier">Y</span><span class="special">></span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">r</span><span class="special">);</span> <span class="comment">// never throws</span>
- </pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Effects</span></dt>
- <dd><p>
- <code class="computeroutput"><span class="identifier">Py_XINCREF</span><span class="special">(</span><span class="identifier">upcast</span><span class="special"><</span><span class="identifier">PyObject</span><span class="special">*>(</span><span class="identifier">r</span><span class="special">.</span><span class="identifier">m_p</span><span class="special">));</span>
- <span class="identifier">Py_XDECREF</span><span class="special">(</span>
- <span class="identifier">upcast</span><span class="special"><</span><span class="identifier">PyObject</span><span class="special">*>(</span><span class="identifier">m_p</span><span class="special">));</span>
- <span class="identifier">m_p</span> <span class="special">=</span>
- <span class="identifier">r</span><span class="special">.</span><span class="identifier">m_p</span><span class="special">;</span></code>
- </p></dd>
- </dl>
- </div>
- <pre class="programlisting"><span class="identifier">T</span><span class="special">*</span> <span class="identifier">release</span><span class="special">();</span>
- </pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Effects</span></dt>
- <dd><p>
- <code class="computeroutput"><span class="identifier">T</span><span class="special">*</span>
- <span class="identifier">x</span> <span class="special">=</span>
- <span class="identifier">m_p</span><span class="special">;</span>
- <span class="identifier">m_p</span> <span class="special">=</span>
- <span class="number">0</span><span class="special">;</span>
- <span class="keyword">return</span> <span class="identifier">x</span><span class="special">;</span></code>
- </p></dd>
- </dl>
- </div>
- <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">reset</span><span class="special">();</span>
- </pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Effects</span></dt>
- <dd><p>
- <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span>
- <span class="special">=</span> <span class="identifier">handle</span><span class="special"><</span><span class="identifier">T</span><span class="special">>();</span></code>
- </p></dd>
- </dl>
- </div>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h4 class="title">
- <a name="utility_and_infrastructure.boost_python_handle_hpp.class_template_handle.class_template_handle_observers"></a><a class="link" href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.class_template_handle.class_template_handle_observers" title="Class template handle observers">Class
- template <code class="computeroutput"><span class="identifier">handle</span></code> observers</a>
- </h4></div></div></div>
- <pre class="programlisting"><span class="identifier">T</span><span class="special">*</span> <span class="keyword">operator</span><span class="special">-></span> <span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
- <span class="identifier">T</span><span class="special">*</span> <span class="identifier">get</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
- </pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Returns</span></dt>
- <dd><p>
- <code class="computeroutput"><span class="identifier">m_p</span><span class="special">;</span></code>
- </p></dd>
- </dl>
- </div>
- <pre class="programlisting"><span class="identifier">T</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">*</span> <span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
- </pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Returns</span></dt>
- <dd><p>
- <code class="computeroutput"><span class="special">*</span><span class="identifier">m_p</span><span class="special">;</span></code>
- </p></dd>
- </dl>
- </div>
- <pre class="programlisting"><span class="keyword">operator</span> <span class="identifier">bool_type</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span> <span class="comment">// never throws</span>
- </pre>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Returns</span></dt>
- <dd><p>
- <code class="computeroutput"><span class="number">0</span></code> if <code class="computeroutput"><span class="identifier">m_p</span> <span class="special">==</span>
- <span class="number">0</span></code>, a pointer convertible
- to true otherwise.
- </p></dd>
- </dl>
- </div>
- </div>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h3 class="title">
- <a name="utility_and_infrastructure.boost_python_handle_hpp.function_borrowed"></a><a class="link" href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.function_borrowed" title="Function borrowed">Function
- <code class="computeroutput"><span class="identifier">borrowed</span></code></a>
- </h3></div></div></div>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span>
- <span class="identifier">detail</span><span class="special">::</span><span class="identifier">borrowed</span><span class="special"><</span><span class="identifier">T</span><span class="special">>*</span> <span class="identifier">borrowed</span><span class="special">(</span><span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">)</span>
- <span class="special">{</span>
- <span class="keyword">return</span> <span class="special">(</span><span class="identifier">detail</span><span class="special">::</span><span class="identifier">borrowed</span><span class="special"><</span><span class="identifier">T</span><span class="special">>*)</span><span class="identifier">p</span><span class="special">;</span>
- <span class="special">}</span>
- </pre>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h3 class="title">
- <a name="utility_and_infrastructure.boost_python_handle_hpp.function_allow_null"></a><a class="link" href="boost_python_handle_hpp.html#utility_and_infrastructure.boost_python_handle_hpp.function_allow_null" title="Function allow_null">Function
- <code class="computeroutput"><span class="identifier">allow_null</span></code></a>
- </h3></div></div></div>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span>
- <span class="identifier">null_ok</span><span class="special"><</span><span class="identifier">T</span><span class="special">>*</span> <span class="identifier">allow_null</span><span class="special">(</span><span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">)</span>
- <span class="special">{</span>
- <span class="keyword">return</span> <span class="special">(</span><span class="identifier">null_ok</span><span class="special"><</span><span class="identifier">T</span><span class="special">>*)</span><span class="identifier">p</span><span class="special">;</span>
- <span class="special">}</span>
- </pre>
- </div>
- </div>
- <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
- <td align="left"></td>
- <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2015 David Abrahams, Stefan Seefeld<p>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>
- </p>
- </div></td>
- </tr></table>
- <hr>
- <div class="spirit-nav">
- <a accesskey="p" href="boost_python_pointee_hpp.html"><img src="../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../utility_and_infrastructure.html"><img src="../../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="boost_python_type_id_hpp.html"><img src="../../images/next.png" alt="Next"></a>
- </div>
- </body>
- </html>
|