boost-react-native-bundle

<html> <head> <meta name="GENERATOR" content="Microsoft FrontPage 5.0"> <meta name="ProgId" content="FrontPage.Editor.Document"> <meta http-equiv="Content-Type" content="text/html; charset=windows-1252"> <title>Filesystem V3 Intro</title> <link rel="stylesheet" type="text/css" href="../../../doc/src/minimal.css"> <body> <table border="0" cellpadding="5" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111"> <tr> <td width="277"> <a href="../../../index.htm"> <img src="../../../boost.png" alt="boost.png (6897 bytes)" align="middle" width="300" height="86" border="0"></a></td> <td align="middle"> <font size="7">Filesystem Version 3<br> Introduction</font></td> </tr> </table> <table border="0" cellpadding="5" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" bgcolor="#D7EEFF" width="100%"> <tr> <td><a href="index.htm">Filesystem Home</a>    <a href="release_history.html">Releases</a>    <a href="reference.html">Reference</a>    <a href="tutorial.html">Tutorial</a>    <a href="faq.htm">FAQ</a>    <a href="portability_guide.htm">Portability</a>    <a href="v3.html">V3 Intro</a>    <a href="v3_design.html">V3 Design</a>    <a href="deprecated.html">Deprecated</a>    </td> </tr> </table> <h1>Boost Filesystem Version 3</h1> <p>Version 3 is a major revision of the Boost Filesystem library. Important changes include:</p> <ul> <li>A single class <code>path</code> handles all aspects of internationalization, replacing the previous template and its <code>path</code> and <code>wpath</code> instantiations. Character types <code>char</code>, <code>wchar_t</code>, <code>char16_t</code>, and <code>char32_t</code> are supported. This is a major simplification of the path abstraction, particularly for functions that take path arguments.<br>  </li> <li>New <code>class path</code> members include:<br>  <ul> <li><code><a href="reference.html#path-has_stem">has_stem</a>()</code></li> <li><code><a href="reference.html#path-has_extension">has_extension</a>()</code></li> <li><code><a href="reference.html#path-is_absolute">is_absolute</a>()</code>. This renames <code>is_complete()</code>, which is now deprecated.</li> <li><code><a href="reference.html#path-is_relative">is_relative</a>()</code></li> <li><code><a href="reference.html#path-make_preferred">make_preferred</a>()<br>  </code></li> </ul> </li> <li>New or improved operations functions include:<br>  <ul> <li><code><a href="reference.html#absolute">absolute</a>()</code>. This replaces the operations function <code> complete()</code>, which is now deprecated. Semantics are now provided for a Windows corner case where the <code>base</code> argument was not an absolute path. Previously this resulted in an exception being thrown.</li> <li><code><a href="reference.html#create_symlink">create_symlink</a>()</code> now supported on both POSIX and Windows.</li> <li><code><a href="reference.html#read_symlink">read_symlink</a>()</code> function added. Supported on both POSIX and Windows. Used to read the contents of a symlink itself.</li> <li><code><a href="reference.html#resize_file">resize_file</a>()</code> function added. Supported on both POSIX and Windows. Used to shrink or grow a regular file.</li> <li><code><a href="reference.html#unique_path">unique_path</a>()</code> function added. Supported on both POSIX and Windows. Used to generate a secure temporary pathname.<br>  </li> </ul> </li> <li>Support for error reporting via <code>error_code</code> is now uniform throughout the operations functions.<br>  </li> <li>Documentation has been reworked, including re-writes of major portions.<br>  </li> <li>A new <a href="tutorial.html">Tutorial</a> provides a hopefully much gentler and more complete introduction for new users. Current users might want to review the <a href="tutorial.html">three sections related to class path</a>.</li> </ul> <h2>Deprecated names and other features</h2> <p>See the <a href="deprecated.html">Deprecated Features page</a> for transition aids that allow much existing code to compile without change using Version 3.</p> <h2>Breaking changes</h2> <p>To ease the transition, Versions 2 and 3 will both be included in the next several Boost releases. Version 2 will be the default version for one release cycle, and then Version 3 will become the default version.</p> <h3>Class <code>path</code></h3> <ul> <li>Class template <code>basic_path</code> and its specializations are replaced by a single <code>class path</code>. Thus any code, such as overloaded functions, that depends on <code>path</code> and <code>wpath</code> being two distinct types will fail to compile and must be restructured. Restructuring may be as simple as removing one of the overloads, but also might require more complex redesign.<br>  </li> <li>Certain functions now return <code>path</code> objects rather than <code> string or wstring</code> objects:<ul> <li><code>root_name()</code></li> <li><code>root_directory()</code></li> <li><code>filename()</code></li> <li><code>stem()</code></li> <li><code>extension()</code></li> </ul> <p>Not all uses will fail; if the function is being called in a context that accepts a <code>path</code>, all is well. If the result is being used in a context requiring a <code>std::string</code> or <code>std::wstring</code>, then <code>.string()</code> or <code>.wstring()</code> respectively must be appended to the function call.<br>  </li> <li> <code>path::iterator::value_type</code> and  <code> path::const_iterator::value_type</code> is <code>path</code> rather than <code> basic_string</code>.</li> </ul> <h3>Compiler support</h3> <ul> <li>Compilers and standard libraries that do not fully support wide characters and wide character strings (<code>std::wstring</code>) are no longer supported.<br>  </li> <li>Cygwin versions prior to 1.7 are no longer supported because they lack wide string support. Cygwin now compiles only for the Windows API and path syntax.<br>  </li> <li>MinGW versions not supporting wide strings are no longer supported.<br>  </li> <li>Microsoft VC++ 7.1 and earlier are no longer supported.</li> </ul> <hr> <p>� Copyright Beman Dawes, 2009</p> <p>Distributed under the Boost Software License, Version 1.0. See <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a></p> <p>Revised 20 March 2012</p> </body> </html>