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19 дек 2024, 19:11
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>binary_ufunc - Boost.Python NumPy extension 1.0 documentation</title> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <link rel="stylesheet" href="../_static/style.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '1.0', COLLAPSE_MODINDEX: false, FILE_SUFFIX: '.html' }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="top" title="Boost.Python NumPy extension 1.0 documentation" href="../index.html" /> <link rel="up" title="Boost.Python NumPy extension Reference" href="index.html" /> <link rel="next" title="multi_iter" href="multi_iter.html" /> <link rel="prev" title="unary_ufunc" href="unary_ufunc.html" /> </head> <body> <div class="header"> <table border="0" cellpadding="7" cellspacing="0" width="100%" summary= "header"> <tr> <td valign="top" width="300"> <h3><a href="../index.html"><img alt="C++ Boost" src="../_static/bpl.png" border="0"></a></h3> </td> <td > <h1 align="center"><a href="../index.html">(NumPy)</a></h1> <!-- <h2 align="center">CallPolicies Concept</h2>--> </td> <td> <div id="searchbox" style="display: none"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" size="18" /> <input type="submit" value="Search" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </td> </tr> </table> </div> <hr/> <div class="content"> <div class="navbar" style="text-align:right;"> <a class="prev" title="unary_ufunc" href="unary_ufunc.html"><img src="../_static/prev.png" alt="prev"/></a> <a class="up" title="Boost.Python NumPy extension Reference" href="index.html"><img src="../_static/up.png" alt="up"/></a> <a class="next" title="multi_iter" href="multi_iter.html"><img src="../_static/next.png" alt="next"/></a> </div> <div class="section" id="binary-ufunc"> <h1><a class="toc-backref" href="#id1">binary_ufunc</a></h1> <div class="contents topic" id="table-of-contents"> <p class="topic-title first">Table of Contents</p> <ul class="simple"> <li><a class="reference internal" href="#binary-ufunc" id="id1">binary_ufunc</a><ul> <li><a class="reference internal" href="#synopsis" id="id2">synopsis</a></li> <li><a class="reference internal" href="#constructors" id="id3">constructors</a></li> <li><a class="reference internal" href="#accessors" id="id4">accessors</a></li> <li><a class="reference internal" href="#example-s" id="id5">Example(s)</a></li> </ul> </li> </ul> </div> <p>A <code class="docutils literal"><span class="pre">binary_ufunc</span></code> is a struct used as an intermediate step to broadcast two arguments so that a C++ function can be converted to a ufunc like function</p> <blockquote> <div><code class="docutils literal"><span class="pre"><boost/python/numpy/ufunc.hpp></span></code> contains the <code class="docutils literal"><span class="pre">binary_ufunc</span></code> structure definitions</div></blockquote> <div class="section" id="synopsis"> <h2><a class="toc-backref" href="#id2">synopsis</a></h2> <div class="highlight-c++"><div class="highlight"><pre><span class="k">namespace</span> <span class="n">boost</span> <span class="p">{</span> <span class="k">namespace</span> <span class="n">python</span> <span class="p">{</span> <span class="k">namespace</span> <span class="n">numpy</span> <span class="p">{</span> <span class="k">template</span> <span class="o"><</span><span class="k">typename</span> <span class="n">TBinaryFunctor</span><span class="p">,</span> <span class="k">typename</span> <span class="n">TArgument1</span><span class="o">=</span><span class="k">typename</span> <span class="n">TBinaryFunctor</span><span class="o">::</span><span class="n">first_argument_type</span><span class="p">,</span> <span class="k">typename</span> <span class="n">TArgument2</span><span class="o">=</span><span class="k">typename</span> <span class="n">TBinaryFunctor</span><span class="o">::</span><span class="n">second_argument_type</span><span class="p">,</span> <span class="k">typename</span> <span class="n">TResult</span><span class="o">=</span><span class="k">typename</span> <span class="n">TBinaryFunctor</span><span class="o">::</span><span class="n">result_type</span><span class="o">></span> <span class="k">struct</span> <span class="n">binary_ufunc</span> <span class="p">{</span> <span class="k">static</span> <span class="n">object</span> <span class="n">call</span><span class="p">(</span><span class="n">TBinaryFunctor</span> <span class="o">&</span> <span class="n">self</span><span class="p">,</span> <span class="n">object</span> <span class="k">const</span> <span class="o">&</span> <span class="n">input1</span><span class="p">,</span> <span class="n">object</span> <span class="k">const</span> <span class="o">&</span> <span class="n">input2</span><span class="p">,</span> <span class="n">object</span> <span class="k">const</span> <span class="o">&</span> <span class="n">output</span><span class="p">);</span> <span class="k">static</span> <span class="n">object</span> <span class="nf">make</span><span class="p">();</span> <span class="p">};</span> <span class="p">}</span> <span class="p">}</span> <span class="p">}</span> </pre></div> </div> </div> <div class="section" id="constructors"> <h2><a class="toc-backref" href="#id3">constructors</a></h2> <div class="highlight-c++"><div class="highlight"><pre><span class="k">struct</span> <span class="n">example_binary_ufunc</span> <span class="p">{</span> <span class="k">typedef</span> <span class="n">any_valid</span> <span class="n">first_argument_type</span><span class="p">;</span> <span class="k">typedef</span> <span class="n">any_valid</span> <span class="n">second_argument_type</span><span class="p">;</span> <span class="k">typedef</span> <span class="n">any_valid</span> <span class="n">result_type</span><span class="p">;</span> <span class="p">};</span> </pre></div> </div> <table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Requirements:</th><td class="field-body">The <code class="docutils literal"><span class="pre">any_valid</span></code> type must be defined using typedef as a valid C++ type in order to use the struct methods correctly</td> </tr> <tr class="field-even field"><th class="field-name">Note:</th><td class="field-body">The struct must be exposed as a Python class, and an instance of the class must be created to use the <code class="docutils literal"><span class="pre">call</span></code> method corresponding to the <code class="docutils literal"><span class="pre">__call__</span></code> attribute of the Python object</td> </tr> </tbody> </table> </div> <div class="section" id="accessors"> <h2><a class="toc-backref" href="#id4">accessors</a></h2> <div class="highlight-c++"><div class="highlight"><pre><span class="k">template</span> <span class="o"><</span><span class="k">typename</span> <span class="n">TBinaryFunctor</span><span class="p">,</span> <span class="k">typename</span> <span class="n">TArgument1</span><span class="o">=</span><span class="k">typename</span> <span class="n">TBinaryFunctor</span><span class="o">::</span><span class="n">first_argument_type</span><span class="p">,</span> <span class="k">typename</span> <span class="n">TArgument2</span><span class="o">=</span><span class="k">typename</span> <span class="n">TBinaryFunctor</span><span class="o">::</span><span class="n">second_argument_type</span><span class="p">,</span> <span class="k">typename</span> <span class="n">TResult</span><span class="o">=</span><span class="k">typename</span> <span class="n">TBinaryFunctor</span><span class="o">::</span><span class="n">result_type</span><span class="o">></span> <span class="k">static</span> <span class="n">object</span> <span class="n">call</span><span class="p">(</span><span class="n">TBinaryFunctor</span> <span class="o">&</span> <span class="n">self</span><span class="p">,</span> <span class="n">object</span> <span class="k">const</span> <span class="o">&</span> <span class="n">input</span><span class="p">,</span> <span class="n">object</span> <span class="k">const</span> <span class="o">&</span> <span class="n">output</span><span class="p">);</span> </pre></div> </div> <table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Requires:</th><td class="field-body">Typenames <code class="docutils literal"><span class="pre">TBinaryFunctor</span></code> and optionally <code class="docutils literal"><span class="pre">TArgument1</span></code> and <code class="docutils literal"><span class="pre">TArgument2</span></code> for argument type and <code class="docutils literal"><span class="pre">TResult</span></code> for result type</td> </tr> <tr class="field-even field"><th class="field-name">Effects:</th><td class="field-body">Passes a Python object to the underlying C++ functor after broadcasting its arguments</td> </tr> </tbody> </table> <div class="highlight-c++"><div class="highlight"><pre><span class="k">template</span> <span class="o"><</span><span class="k">typename</span> <span class="n">TBinaryFunctor</span><span class="p">,</span> <span class="k">typename</span> <span class="n">TArgument1</span><span class="o">=</span><span class="k">typename</span> <span class="n">TBinaryFunctor</span><span class="o">::</span><span class="n">first_argument_type</span><span class="p">,</span> <span class="k">typename</span> <span class="n">TArgument2</span><span class="o">=</span><span class="k">typename</span> <span class="n">TBinaryFunctor</span><span class="o">::</span><span class="n">second_argument_type</span><span class="p">,</span> <span class="k">typename</span> <span class="n">TResult</span><span class="o">=</span><span class="k">typename</span> <span class="n">TBinaryFunctor</span><span class="o">::</span><span class="n">result_type</span><span class="o">></span> <span class="k">static</span> <span class="n">object</span> <span class="n">make</span><span class="p">();</span> </pre></div> </div> <table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Requires:</th><td class="field-body">Typenames <code class="docutils literal"><span class="pre">TBinaryFunctor</span></code> and optionally <code class="docutils literal"><span class="pre">TArgument1</span></code> and <code class="docutils literal"><span class="pre">TArgument2</span></code> for argument type and <code class="docutils literal"><span class="pre">TResult</span></code> for result type</td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">A Python function object to call the overloaded () operator in the struct (in typical usage)</td> </tr> </tbody> </table> </div> <div class="section" id="example-s"> <h2><a class="toc-backref" href="#id5">Example(s)</a></h2> <div class="highlight-c++"><div class="highlight"><pre><span class="k">namespace</span> <span class="n">p</span> <span class="o">=</span> <span class="n">boost</span><span class="o">::</span><span class="n">python</span><span class="p">;</span> <span class="k">namespace</span> <span class="n">np</span> <span class="o">=</span> <span class="n">boost</span><span class="o">::</span><span class="n">python</span><span class="o">::</span><span class="n">numpy</span><span class="p">;</span> <span class="k">struct</span> <span class="n">BinarySquare</span> <span class="p">{</span> <span class="k">typedef</span> <span class="kt">double</span> <span class="n">first_argument_type</span><span class="p">;</span> <span class="k">typedef</span> <span class="kt">double</span> <span class="n">second_argument_type</span><span class="p">;</span> <span class="k">typedef</span> <span class="kt">double</span> <span class="n">result_type</span><span class="p">;</span> <span class="kt">double</span> <span class="nf">operator</span><span class="p">()(</span><span class="kt">double</span> <span class="n">a</span><span class="p">,</span><span class="kt">double</span> <span class="n">b</span><span class="p">)</span> <span class="k">const</span> <span class="p">{</span> <span class="k">return</span> <span class="p">(</span><span class="n">a</span><span class="o">*</span><span class="n">a</span> <span class="o">+</span> <span class="n">b</span><span class="o">*</span><span class="n">b</span><span class="p">)</span> <span class="p">;</span> <span class="p">}</span> <span class="p">};</span> <span class="n">p</span><span class="o">::</span><span class="n">object</span> <span class="n">ud</span> <span class="o">=</span> <span class="n">p</span><span class="o">::</span><span class="n">class_</span><span class="o"><</span><span class="n">BinarySquare</span><span class="p">,</span> <span class="n">boost</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">BinarySquare</span><span class="o">></span> <span class="o">></span><span class="p">(</span><span class="s">"BinarySquare"</span><span class="p">).</span><span class="n">def</span><span class="p">(</span><span class="s">"__call__"</span><span class="p">,</span> <span class="n">np</span><span class="o">::</span><span class="n">binary_ufunc</span><span class="o"><</span><span class="n">BinarySquare</span><span class="o">>::</span><span class="n">make</span><span class="p">());</span> <span class="n">p</span><span class="o">::</span><span class="n">object</span> <span class="n">inst</span> <span class="o">=</span> <span class="n">ud</span><span class="p">();</span> <span class="n">result_array</span> <span class="o">=</span> <span class="n">inst</span><span class="p">.</span><span class="n">attr</span><span class="p">(</span><span class="s">"__call__"</span><span class="p">)(</span><span class="n">demo_array</span><span class="p">,</span><span class="n">demo_array</span><span class="p">)</span> <span class="p">;</span> <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o"><<</span> <span class="s">"Square of list with binary ufunc is "</span> <span class="o"><<</span> <span class="n">p</span><span class="o">::</span><span class="n">extract</span> <span class="o"><</span><span class="kt">char</span> <span class="k">const</span> <span class="o">*</span> <span class="o">></span> <span class="p">(</span><span class="n">p</span><span class="o">::</span><span class="n">str</span><span class="p">(</span><span class="n">result_array</span><span class="p">))</span> <span class="o"><<</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span> <span class="p">;</span> </pre></div> </div> </div> </div> <div class="navbar" style="text-align:right;"> <a class="prev" title="unary_ufunc" href="unary_ufunc.html"><img src="../_static/prev.png" alt="prev"/></a> <a class="up" title="Boost.Python NumPy extension Reference" href="index.html"><img src="../_static/up.png" alt="up"/></a> <a class="next" 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