82 lines
4.8 KiB
HTML
82 lines
4.8 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<title>Approximate map between error code designs - Boost.Outcome documentation</title>
|
|
<link rel="stylesheet" href="../css/boost.css" type="text/css">
|
|
<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
|
|
<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
|
|
|
|
<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
|
|
<body><div class="spirit-nav">
|
|
<a accesskey="p" href="../experimental/advantages.html"><img src="../images/prev.png" alt="Prev"></a>
|
|
<a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
|
|
<a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../experimental/differences.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
|
|
<div class="titlepage"><div><div><h1 style="clear: both">Approximate map between error code designs</h1></div></div></div>
|
|
<p>Much of the design of Boost.System (which went on to become <code><system_error></code>)
|
|
has been retained in proposed <code><system_error2></code>, so an approximate map between
|
|
<code><system_error2></code> and <code><system_error></code> and Boost.System can be given:</p>
|
|
|
|
<table width="100%" cellpadding="5" border="1">
|
|
<colgroup>
|
|
<col width="25%">
|
|
<col width="25%">
|
|
<col width="50%">
|
|
</colgroup>
|
|
<tr><th>C++ 17 <tt><system_error></tt><th>Boost.System<th>Proposed <tt><system_error2></tt>
|
|
<tr>
|
|
<td style="vertical-align: top;"><tt>std::errc</tt>
|
|
<td style="vertical-align: top;"><tt>boost::system::errc</tt>
|
|
<td style="vertical-align: top;"><tt>experimental::errc</tt> (almost identical)
|
|
<tr>
|
|
<td style="vertical-align: top;"><tt>std::error_category</tt>
|
|
<td style="vertical-align: top;"><tt>boost::system::error_category</tt>
|
|
<td style="vertical-align: top;"><tt>experimental::status_code_domain</tt>
|
|
<tr>
|
|
<td style="vertical-align: top;"><tt>std::generic_category</tt>
|
|
<td style="vertical-align: top;"><tt>boost::system::generic_category</tt>
|
|
<td style="vertical-align: top;"><tt>experimental::generic_code_domain</tt>
|
|
<tr>
|
|
<td style="vertical-align: top;"><tt>std::system_category</tt>
|
|
<td style="vertical-align: top;"><tt>boost::system::system_category</tt>
|
|
<td style="vertical-align: top;">One of:<ul>
|
|
<li><tt>experimental::posix_code_domain</tt> (POSIX systems)<p>
|
|
<li><tt>experimental::win32_code_domain</tt> (Microsoft Windows)<p>
|
|
<li><tt>experimental::nt_code_domain</tt> (Microsoft Windows)
|
|
</ul>
|
|
<tr>
|
|
<td style="vertical-align: top;"><tt>std::error_condition</tt>
|
|
<td style="vertical-align: top;"><tt>boost::system::error_condition</tt>
|
|
<td style="vertical-align: top;"><b>No equivalent</b> (deliberately removed as hindsight proved it to be a design mistake leading to much confusing and hard to audit for correctness code)
|
|
<tr>
|
|
<td style="vertical-align: top;"><tt>std::error_code</tt>
|
|
<td style="vertical-align: top;"><tt>boost::system::error_code</tt>
|
|
<td style="vertical-align: top;">One of:<ul>
|
|
<li><tt>experimental::status_code<DomainType></tt><p>
|
|
<li><tt>const experimental::status_code<void> &</tt><p>
|
|
<li><tt>experimental::status_code<erased<intptr_t>></tt> (aliased to <tt>experimental::system_code</tt>)<p>
|
|
<li><tt>experimental::errored_status_code<DomainType></tt><p>
|
|
<li><tt>const experimental::errored_status_code<void> &</tt><p>
|
|
<li><tt>experimental::errored_status_code<erased<intptr_t>></tt> (aliased to <tt>experimental::error</tt>)
|
|
</ul>
|
|
<tr>
|
|
<td style="vertical-align: top;"><tt>std::system_error</tt>
|
|
<td style="vertical-align: top;"><tt>boost::system::system_error</tt>
|
|
<td style="vertical-align: top;">One of:<ul>
|
|
<li><tt>const experimental::status_error<void> &</tt><p>
|
|
<li><tt>experimental::status_error<DomainType></tt>
|
|
</ul>
|
|
</table>
|
|
|
|
<p>As is obvious from the above, in <code><system_error2></code> one must be much more specific and accurate
|
|
with respect to intent and specification and desired semantics than with <code><system_error></code>. Much
|
|
ambiguity and incorrectness which flies silently in <code><system_error></code> will
|
|
refuse to compile in <code><system_error2></code>.</p>
|
|
|
|
|
|
</div><p><small>Last revised: January 27, 2019 at 13:13:26 UTC</small></p>
|
|
<hr>
|
|
<div class="spirit-nav">
|
|
<a accesskey="p" href="../experimental/advantages.html"><img src="../images/prev.png" alt="Prev"></a>
|
|
<a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
|
|
<a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../experimental/differences.html"><img src="../images/next.png" alt="Next"></a></div></body>
|
|
</html>
|