boost-react-native-bundle

<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Examples</title> <link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../align.html" title="Chapter 2. Boost.Align"> <link rel="prev" href="tutorial.html" title="Tutorial"> <link rel="next" href="reference.html" title="Reference"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"></td> <td align="center"><a href="../../../index.html">Home</a></td> <td align="center"><a href="../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="tutorial.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../align.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="reference.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="align.examples"></a><a class="link" href="examples.html" title="Examples">Examples</a> </h2></div></div></div> <div class="toc"><dl class="toc"> <dt><a href="examples.html#align.examples.aligned_ptr">aligned_ptr and make_aligned</a></dt> <dt><a href="examples.html#align.examples.aligned_vector">aligned_vector</a></dt> </dl></div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="align.examples.aligned_ptr"></a><a class="link" href="examples.html#align.examples.aligned_ptr" title="aligned_ptr and make_aligned">aligned_ptr and make_aligned</a> </h3></div></div></div> This example presents an alternative to <code class="computeroutput">std::unique_ptr</code> for objects allocated with the aligned allocation function. It is defined simply by providing an alias template which uses <code class="computeroutput">std::unique_ptr</code> with our aligned deleter in place of the default <code class="computeroutput">std::default_delete</code> deleter. It also presents an alternative to <code class="computeroutput">std::make_unique</code> for the creation of these aligned unique pointer objects. It is implemented using our aligned allocation function. <h5> <a name="align.examples.aligned_ptr.h0"></a> <a name="align.examples.aligned_ptr.implementation"></a><a class="link" href="examples.html#align.examples.aligned_ptr.implementation">Implementation</a> </h5> <pre class="programlisting">#include <boost/align/aligned_alloc.hpp> #include <boost/align/aligned_delete.hpp> #include <memory> template<class T> using aligned_ptr = std::unique_ptr<T, boost::alignment::aligned_delete>; template<class T, class... Args> inline aligned_ptr<T> make_aligned(Args&&... args) { auto p = boost::alignment:: aligned_alloc(alignof(T), sizeof(T)); if (!p) { throw std::bad_alloc(); } try { auto q = ::new(p) T(std::forward<Args>(args)...); return aligned_ptr<T>(q); } catch (...) { boost::alignment::aligned_free(p); throw; } } </pre> <h5> <a name="align.examples.aligned_ptr.h1"></a> <a name="align.examples.aligned_ptr.usage"></a><a class="link" href="examples.html#align.examples.aligned_ptr.usage">Usage</a> </h5> <pre class="programlisting">struct alignas(16) type { float data[4]; }; int main() { auto p = make_aligned<type>(); p->data[0] = 1.0f; } </pre> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="align.examples.aligned_vector"></a><a class="link" href="examples.html#align.examples.aligned_vector" title="aligned_vector">aligned_vector</a> </h3></div></div></div> This example presents an alternative to <code class="computeroutput">std::vector</code> that can be used with over-aligned types, and allows specifying a minimum alignment. It is defined simply by providing an alias template which uses <code class="computeroutput">std::vector</code> with our aligned allocator. <h5> <a name="align.examples.aligned_vector.h0"></a> <a name="align.examples.aligned_vector.implementation"></a><a class="link" href="examples.html#align.examples.aligned_vector.implementation">Implementation</a> </h5> <pre class="programlisting">#include <boost/align/aligned_allocator.hpp> #include <vector> template<class T, std::size_t Alignment = 1> using aligned_vector = std::vector<T, boost::alignment::aligned_allocator<T, Alignment> >; </pre> <h5> <a name="align.examples.aligned_vector.h1"></a> <a name="align.examples.aligned_vector.usage"></a><a class="link" href="examples.html#align.examples.aligned_vector.usage">Usage</a> </h5> <pre class="programlisting">enum { cache_line = 64 }; int main() { aligned_vector<char, cache_line> v(32); v[0] = 1; } </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 © 2014 Glen Fernandes Distributed under the <a href="http://boost.org/LICENSE_1_0.txt" target="_top">Boost Software License, Version 1.0</a>. </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="tutorial.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../align.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="reference.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>