gugdun
/
pocketpy
mirrorاز https://github.com/pocketpy/pocketpy


			
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<doc-anchor-target id="write-c-bindings" class="break-words">
    <h1>
        <doc-anchor-trigger class="header-anchor-trigger" to="#write-c-bindings">#</doc-anchor-trigger>
        <span>Write C++ Bindings</span>
    </h1>
</doc-anchor-target>
<doc-anchor-target id="quick-start">
    <h2>
        <doc-anchor-trigger class="header-anchor-trigger" to="#quick-start">#</doc-anchor-trigger>
        <span>Quick Start</span>
    </h2>
</doc-anchor-target>
<p>pkpy provides a <a href="https://pybind11.readthedocs.io/en/stable/">pybind11</a> compatible layer which allows users to do convenient bindings.
Header files are located in the <code translate="no" v-pre>include/pybind11</code> directory. Make sure you have added <code translate="no" v-pre>-Iinclude</code> to your compiler flags.</p>
<p>To begin with, use <code translate="no" v-pre>py::scoped_interpreter guard{}</code> to start the interpreter before using any Python objects.
Or explicitly call <code translate="no" v-pre>py::interpreter::initialize()</code> and <code translate="no" v-pre>py::interpreter::finalize()</code>.</p>
<doc-anchor-target id="module">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#module">#</doc-anchor-trigger>
        <span>module</span>
    </h3>
</doc-anchor-target>
<div id="module-code-1" class="codeblock-wrapper"><doc-codeblock>
<pre translate="no" class="language-cpp"><code v-pre class="language-cpp">#include &lt;pybind11/pybind11.h&gt;
namespace py = pybind11;

PYBIND11_EMBEDDED_MODULE(example, m) {
    m.def(&quot;add&quot;, [](int a, int b) {
        return a + b;
    });

    auto math = m.def_submodule(&quot;math&quot;);
}</code></pre>
</doc-codeblock></div>
<doc-anchor-target id="function">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#function">#</doc-anchor-trigger>
        <span>function</span>
    </h3>
</doc-anchor-target>
<div id="function-code-1" class="codeblock-wrapper"><doc-codeblock>
<pre translate="no" class="language-cpp"><code v-pre class="language-cpp">int add(int a, int b) { return a + b; }

int add(int a, int b, int c) { return a + b + c; }

void register_function(py::module_&amp; m)
{
    m.def(&quot;add&quot;, py::overload_cast&lt;int, int&gt;(&amp;add));

    // support function overload
    m.def(&quot;add&quot;, py::overload_cast&lt;int, int, int&gt;(&amp;add));

    // bind with default arguments
    m.def(&quot;sub&quot;, [](int a, int b) { 
        return a - b; 
    }, py::arg(&quot;a&quot;) = 1, py::arg(&quot;b&quot;) = 2);

    // bind *args
    m.def(&quot;add&quot;, [](py::args args) {
        int sum = 0;
        for (auto&amp; arg : args) {
            sum += arg.cast&lt;int&gt;();
        }
        return sum;
    });

    // bind **kwargs
    m.def(&quot;add&quot;, [](py::kwargs kwargs) {
        int sum = 0;
        for (auto item : kwargs) {
            sum += item.second.cast&lt;int&gt;();
        }
        return sum;
    });
}</code></pre>
</doc-codeblock></div>
<doc-anchor-target id="class">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#class">#</doc-anchor-trigger>
        <span>class</span>
    </h3>
</doc-anchor-target>
<div id="class-code-1" class="codeblock-wrapper"><doc-codeblock>
<pre translate="no" class="language-cpp"><code v-pre class="language-cpp">struct Point
{
    const int x;
    int y;

public:
    Point() : x(0), y(0) {}

    Point(int x, int y) : x(x), y(y) {}

    Point(const Point&amp; p) : x(p.x), y(p.y) {}

    std::string stringfy() const { 
        return &quot;(&quot; + std::to_string(x) + &quot;, &quot; + std::to_string(y) + &quot;)&quot;; 
    }
};

struct Point3D : Point
{
private:
    int z;

public:
    Point3D(int x, int y, int z) : Point(x, y), z(z) {}

    int get_z() const { return z; }

    void set_z(int z) { this-&gt;z = z; }
};

void bind_class(py::module_&amp; m)
{
    py::class_&lt;Point&gt;(m, &quot;Point&quot;)
        .def(py::init&lt;&gt;())
        .def(py::init&lt;int, int&gt;())
        .def(py::init&lt;const Point&amp;&gt;())
        .def_readonly(&quot;x&quot;, &amp;Point::x)
        .def_readwrite(&quot;y&quot;, &amp;Point::y)
        .def(&quot;__str__&quot;, &amp;Point::stringfy);

    // only support single inheritance
    py::class_&lt;Point3D, Point&gt;(m, &quot;Point3D&quot;, py::dynamic_attr())
        .def(py::init&lt;int, int, int&gt;())
        .def_property(&quot;z&quot;, &amp;Point3D::get_z, &amp;Point3D::set_z);

    // dynamic_attr will enable the dict of bound class
}</code></pre>
</doc-codeblock></div>
<doc-anchor-target id="operators">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#operators">#</doc-anchor-trigger>
        <span>operators</span>
    </h3>
</doc-anchor-target>
<div id="operators-code-1" class="codeblock-wrapper"><doc-codeblock>
<pre translate="no" class="language-cpp"><code v-pre class="language-cpp">#include &lt;pybind11/operators.h&gt;
namespace py = pybind11;

struct Int {
    int value;

    Int(int value) : value(value) {}

    Int operator+(const Int&amp; other) const {
        return Int(value + other.value);
    }

    Int operator-(const Int&amp; other) const {
        return Int(value - other.value);
    }

    bool operator==(const Int&amp; other) const {
        return value == other.value;
    }

    bool operator!=(const Int&amp; other) const {
        return value != other.value;
    }
};

void bind_operators(py::module_&amp; m)
{
    py::class_&lt;Int&gt;(m, &quot;Int&quot;)
        .def(py::init&lt;int&gt;())
        .def(py::self + py::self)
        .def(py::self - py::self)
        .def(py::self == py::self)
        .def(py::self != py::self);
        // other operators are similar
}</code></pre>
</doc-codeblock></div>
<doc-anchor-target id="pyobject">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#pyobject">#</doc-anchor-trigger>
        <span>py::object</span>
    </h3>
</doc-anchor-target>
<p><code translate="no" v-pre>py::object</code> is just simple wrapper around <code translate="no" v-pre>PyVar</code>. It supports some convenient methods to interact with Python objects.</p>
<p>here are some common methods:</p>
<div id="pyobject-code-1" class="codeblock-wrapper"><doc-codeblock>
<pre translate="no" class="language-cpp"><code v-pre class="language-cpp">obj.attr(&quot;x&quot;); // access attribute
obj[1]; // access item

obj.is_none(); // same as obj is None in Python
obj.is(obj2); // same as obj is obj2 in Python

// operators
obj + obj2; // same as obj + obj2 in Python
// ...
obj == obj2; // same as obj == obj2 in Python
// ...

obj(...); // same as obj.__call__(...)

py::cast(obj); // cast to Python object
obj.cast&lt;T&gt;; // cast to C++ type

py::type::of(obj); // get type of obj
py::type::of&lt;T&gt;(); // get type of T, if T is registered</code></pre>
</doc-codeblock></div>
<p>you can also create some builtin objects with their according wrappers:</p>
<div id="pyobject-code-2" class="codeblock-wrapper"><doc-codeblock>
<pre translate="no" class="language-cpp"><code v-pre class="language-cpp">py::bool_ b = {true};
py::int_ i = {1};
py::float_ f = {1.0};
py::str s = {&quot;hello&quot;};
py::list l = {1, 2, 3};
py::tuple t = {1, 2, 3};
// ...</code></pre>
</doc-codeblock></div>
<doc-anchor-target id="more-examples">
    <h2>
        <doc-anchor-trigger class="header-anchor-trigger" to="#more-examples">#</doc-anchor-trigger>
        <span>More Examples</span>
    </h2>
</doc-anchor-target>
<p>More examples please see the test <a href="https://github.com/pocketpy/gsoc-2024-dev/tree/main/pybind11/tests">folder</a> in the GSoC repository. All tested features are supported.</p>
<doc-anchor-target id="limits-and-comparison">
    <h2>
        <doc-anchor-trigger class="header-anchor-trigger" to="#limits-and-comparison">#</doc-anchor-trigger>
        <span>Limits and Comparison</span>
    </h2>
</doc-anchor-target>
<p>This is a feature list of pybind11 for pocketpy. It lists all completed and pending features. It also lists the features that cannot be implemented in the current version of pocketpy.</p>
<doc-anchor-target id="function-1">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#function-1">#</doc-anchor-trigger>
        <span><a href="https://pybind11.readthedocs.io/en/stable/advanced/functions.html">Function</a></span>
    </h3>
</doc-anchor-target>
<ul class="contains-task-list">
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> Function overloading</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> Return value policy</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> is_prepend</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>*args</code> and <code translate="no" v-pre>**kwargs</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> Keep-alive</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> Call Guard</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> Default arguments</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> Keyword-Only arguments</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> Positional-Only arguments</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> Allow/Prohibiting None arguments</li>
</ul>
<doc-anchor-target id="class-1">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#class-1">#</doc-anchor-trigger>
        <span><a href="https://pybind11.readthedocs.io/en/stable/classes.html">Class</a></span>
    </h3>
</doc-anchor-target>
<ul class="contains-task-list">
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> Creating bindings for a custom type</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> Binding lambda functions</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> Dynamic attributes</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> Inheritance and automatic downcasting</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> Enumerations and internal types</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> Instance and static fields</li>
</ul>
<blockquote>
<p>Binding static fields may never be implemented in pocketpy because it requires a metaclass, which is a heavy and infrequently used feature.</p>
</blockquote>
<doc-anchor-target id="exceptions">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#exceptions">#</doc-anchor-trigger>
        <span><a href="https://pybind11.readthedocs.io/en/stable/advanced/exceptions.html">Exceptions</a></span>
    </h3>
</doc-anchor-target>
<p>Need further discussion.</p>
<doc-anchor-target id="smart-pointers">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#smart-pointers">#</doc-anchor-trigger>
        <span><a href="https://pybind11.readthedocs.io/en/stable/advanced/smart_ptrs.html">Smart pointers</a></span>
    </h3>
</doc-anchor-target>
<ul class="contains-task-list">
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> std::shared_ptr</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> std::unique_ptr</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> Custom smart pointers</li>
</ul>
<doc-anchor-target id="type-conversions">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#type-conversions">#</doc-anchor-trigger>
        <span><a href="https://pybind11.readthedocs.io/en/stable/advanced/cast/index.html">Type conversions</a></span>
    </h3>
</doc-anchor-target>
<ul class="contains-task-list">
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> Python built-in types</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> STL Containers</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> Functional</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> Chrono</li>
</ul>
<doc-anchor-target id="python-c-interface">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#python-c-interface">#</doc-anchor-trigger>
        <span><a href="https://pybind11.readthedocs.io/en/stable/advanced/pycpp/object.html">Python C++ interface</a></span>
    </h3>
</doc-anchor-target>
<p>Need further discussion.</p>
<ul class="contains-task-list">
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>object</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>none</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>type</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>bool_</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>int_</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>float_</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>str</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> <code translate="no" v-pre>bytes</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> <code translate="no" v-pre>bytearray</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>tuple</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>list</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> <code translate="no" v-pre>set</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>dict</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> <code translate="no" v-pre>slice</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>iterable</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>iterator</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> <code translate="no" v-pre>function</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> <code translate="no" v-pre>buffer</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> <code translate="no" v-pre>memoryview</code></li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> <code translate="no" v-pre>capsule</code></li>
</ul>
<doc-anchor-target id="miscellaneous">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#miscellaneous">#</doc-anchor-trigger>
        <span><a href="https://pybind11.readthedocs.io/en/stable/advanced/misc.html">Miscellaneous</a></span>
    </h3>
</doc-anchor-target>
<ul class="contains-task-list">
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> Global Interpreter Lock (GIL)</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> Binding sequence data types, iterators, the slicing protocol, etc.</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> Convenient operators binding</li>
</ul>
<doc-anchor-target id="differences-between-cpython-and-pocketpy">
    <h3>
        <doc-anchor-trigger class="header-anchor-trigger" to="#differences-between-cpython-and-pocketpy">#</doc-anchor-trigger>
        <span>Differences between CPython and pocketpy</span>
    </h3>
</doc-anchor-target>
<ul>
<li><p>only <code translate="no" v-pre>add</code>, <code translate="no" v-pre>sub</code> and <code translate="no" v-pre>mul</code> have corresponding right versions in pocketpy. So if you bind <code translate="no" v-pre>int() &gt;&gt; py::self</code>, it will has no effect in pocketpy.</p>
</li>
<li><p><code translate="no" v-pre>__new__</code> and <code translate="no" v-pre>__del__</code> are not supported in pocketpy.</p>
</li>
<li><p>in-place operators, such as <code translate="no" v-pre>+=</code>, <code translate="no" v-pre>-=</code>, <code translate="no" v-pre>*=</code>, etc., are not supported in pocketpy.</p>
</li>
<li><p>the return value of <code translate="no" v-pre>globals</code> is immutable in pocketpy.</p>
</li>
</ul>

                
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