1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 3<title>base - Boost.Outcome documentation</title> 4<link rel="stylesheet" href="../../css/boost.css" type="text/css"> 5<meta name="generator" content="Hugo 0.52 with Boostdoc theme"> 6<meta name="viewport" content="width=device-width,initial-scale=1.0"/> 7 8<link rel="icon" href="../../images/favicon.ico" type="image/ico"/> 9<body><div class="spirit-nav"> 10<a accesskey="p" href="../../reference/policies.html"><img src="../../images/prev.png" alt="Prev"></a> 11 <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a> 12 <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/base/ub.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content"> 13 14 <div class="titlepage"><div><div><h1 style="clear: both"><code>base</code></h1></div></div></div> 15 16 17<p>Implements the base class of most policy classes defining the narrow observer policies.</p> 18 19<p><em>Requires</em>: Nothing.</p> 20 21<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p> 22 23<p><em>Header</em>: <code><boost/outcome/policy/base.hpp></code></p> 24 25<h3 id="protected-member-functions">Protected member functions</h3> 26 27<h4 id="special">Special</h4> 28 29<ol class="children children-li"><li> 30 <a href="../../reference/policies/base/ub.html" ><code>static void _ub(Impl &&)</code></a> 31<p>Special function which causes noticeable hard undefined behaviour.</p></li></ol> 32 33<h4 id="observers">Observers</h4> 34 35<ol class="children children-li"><li> 36 <a href="../../reference/policies/base/has_value.html" ><code>static bool _has_value(Impl &&) noexcept</code></a> 37<p>Returns true if a value is present in the implementation passed in. Constexpr, never throws.</p><li> 38 <a href="../../reference/policies/base/has_error.html" ><code>static bool _has_error(Impl &&) noexcept</code></a> 39<p>Returns true if an error is present in the implementation passed in. Constexpr, never throws.</p><li> 40 <a href="../../reference/policies/base/has_exception.html" ><code>static bool _has_exception(Impl &&) noexcept</code></a> 41<p>Returns true if an exception is present in the implementation passed in. Constexpr, never throws.</p><li> 42 <a href="../../reference/policies/base/has_error_is_errno.html" ><code>static bool _has_error_is_errno(Impl &&) noexcept</code></a> 43<p>Returns true if the error code in the implementation passed in has a domain or category matching that of POSIX <code>errno</code>. Constexpr, never throws.</p><li> 44 <a href="../../reference/policies/base/value.html" ><code>static auto &&_value(Impl &&) noexcept</code></a> 45<p>Returns a reference to the value in the implementation passed in. Constexpr, never throws.</p><li> 46 <a href="../../reference/policies/base/error.html" ><code>static auto &&_error(Impl &&) noexcept</code></a> 47<p>Returns a reference to the error in the implementation passed in. Constexpr, never throws.</p><li> 48 <a href="../../reference/policies/base/exception.html" ><code>static auto &&_exception(Impl &&) noexcept</code></a> 49<p>Returns a reference to the exception in the implementation passed in. Constexpr, never throws.</p></li></ol> 50 51<h4 id="modifiers">Modifiers</h4> 52 53<ol class="children children-li"><li> 54 <a href="../../reference/policies/base/set_has_value.html" ><code>static void _set_has_value(Impl &&, bool) noexcept</code></a> 55<p>Sets whether the implementation has a value. Constexpr, never throws.</p><li> 56 <a href="../../reference/policies/base/set_has_error.html" ><code>static void _set_has_error(Impl &&, bool) noexcept</code></a> 57<p>Sets whether the implementation has an error. Constexpr, never throws.</p><li> 58 <a href="../../reference/policies/base/set_has_exception.html" ><code>static void _set_has_exception(Impl &&, bool) noexcept</code></a> 59<p>Sets whether the implementation has an exception. Constexpr, never throws.</p><li> 60 <a href="../../reference/policies/base/set_has_error_is_errno.html" ><code>static void _set_has_exception(Impl &&, bool) noexcept</code></a> 61<p>Sets whether the implementation’s error code has a domain or category matching that of POSIX <code>errno</code>. Constexpr, never throws.</p></li></ol> 62 63<h3 id="public-member-functions">Public member functions</h3> 64 65<ol class="children children-li"><li> 66 <a href="../../reference/policies/base/narrow_value_check.html" ><code>static void narrow_value_check(Impl &&) noexcept</code></a> 67<p>Observer policy performing hard UB if no value is present. Constexpr, never throws.</p><li> 68 <a href="../../reference/policies/base/narrow_error_check.html" ><code>static void narrow_error_check(Impl &&) noexcept</code></a> 69<p>Observer policy performing hard UB if no error is present. Constexpr, never throws.</p><li> 70 <a href="../../reference/policies/base/narrow_exception_check.html" ><code>static void narrow_exception_check(Impl &&) noexcept</code></a> 71<p>Observer policy performing hard UB if no exception is present. Constexpr, never throws.</p></li></ol> 72 73 74 75 76 77 78 79 </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p> 80<hr> 81<div class="spirit-nav"> 82<a accesskey="p" href="../../reference/policies.html"><img src="../../images/prev.png" alt="Prev"></a> 83 <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a> 84 <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/base/ub.html"><img src="../../images/next.png" alt="Next"></a></div></body> 85</html> 86
