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Added advanced type conversion. Updated site CSS.
git-svn-id: http://svn.dsource.org/projects/pyd/trunk@114 1df65b71-e716-0410-9316-ac55df2b1602
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> | ||
| <html> | ||
| <head> | ||
| <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> | ||
| <link href="pyd.css" rel="stylesheet" type="text/css"> | ||
| <title>Advanced type conversion</title> | ||
| </head> | ||
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| <body> | ||
| <div id="nav"> | ||
| <p><big>Contents</big></p> | ||
| <ul> | ||
| <li><a class="nav" href="index.html">Main</a></li> | ||
| <li><a class="nav" href="install.html">Installation</a></li> | ||
| <li><a class="nav" href="basics.html">The basics</a></li> | ||
| <li><a class="nav" href="celerid.html">CeleriD</a></li> | ||
| <li><a class="nav" href="conversion.html">Type conversion</a></li> | ||
| <li><a class="navcur" href="adv_conversion.html">Advanced type conversion</a></li> | ||
| <li><a class="nav" href="func_wrapping.html">Function wrapping</a></li> | ||
| <li><a class="nav" href="class_wrapping.html">Class wrapping</a></li> | ||
| <li><a class="nav" href="inherit.html">Inheritance</a></li> | ||
| <li><a class="nav" href="struct_wrapping.html">Struct wrapping</a></li> | ||
| <li><a class="nav" href="except_wrapping.html">Exception wrapping</a></li> | ||
| <li><a class="nav" href="pydobject.html">PydObject</a></li> | ||
| <li><a class="nav" href="vsboost.html">vs. Boost.Python</a></li> | ||
| <li><a class="nav" href="credits.html">Credits</a></li> | ||
| </ul> | ||
| </div> | ||
|
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| <div id="content"> | ||
|
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| <h1>Advanced type conversion</h1> | ||
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| <p>It is frequently useful to extend Pyd's type conversion mechanisms. The usual way to do this is to wrap classes or structs. Pyd has two additional mechanisms for more complex situations.</p> | ||
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| <dl> | ||
| <dt><code>void d_to_python(<span class="t_arg">dg_t</span>) (<span class="t_arg">dg_t</span> <span class="arg">dg</span>);</code></dt> | ||
| <dd>This allows the user to define a function for returning a D type to Python. The <span class="arg">dg</span> may be either a function pointer or a delegate. The argument to the function pointer is of the type to convert. The return type of the function pointer can be any convertible type.</dd> | ||
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| <dt><code>void python_to_d(<span class="t_arg">dg_t</span>) (<span class="t_arg">dg_t</span> <span class="arg">dg</span>);</code></dt> | ||
| <dd>This allows the user to define a function for converting a Python object to a D type. The <span class="arg">dg</span> may be either a function pointer or a delegate. The argument to the function pointer can be any convertible type. The return type of the function pointer is the type to convert.</dd> | ||
| </dl> | ||
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| <p>Conversion functions defined with either of the above functions only take effect if Pyd's regular type conversion mechanisms fail. This would usually happen if a wrapped function returns or has a parameter of some un-wrapped class or struct type.</p> | ||
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| <h3><a class="anchor" name="examples">Examples</a></h3> | ||
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| <pre class="code"><span class="keyword">import</span> std.stdio; | ||
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| <span class="keyword">struct</span> S { | ||
| <span class="keyword">int</span> i; | ||
| } | ||
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| S foo() { | ||
| S s; | ||
| s.i = <span class="number">12</span>; | ||
| } | ||
| <span class="keyword">void</span> bar(S s) { | ||
| writefln(s); | ||
| } | ||
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| <span class="keyword">extern</span> (C) <span class="keyword">void</span> PydMain() { | ||
| d_to_python(<span class="keyword">delegate int</span>(S s) { <span class="keyword">return</span> s.i; }); | ||
| python_to_d(<span class="keyword">delegate</span> S(<span class="keyword">int</span> i) { S s; s.i = i; <span class="keyword">return</span> s; }); | ||
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| def!(foo); | ||
| def!(bar); | ||
| module_init(); | ||
| }</pre> | ||
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| <p>And in Python:</p> | ||
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| <pre class="code">>>> foo() | ||
| 12 | ||
| >>> bar(<span class="number">20</span>) | ||
| 20</pre> | ||
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| </div> | ||
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| </body> | ||
| </html> |
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