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‎issue4134.html‎

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@@ -67,6 +67,7 @@ <h3 id="4134"><a href="lwg-defects.html#4134">4134</a>. Issue with Philox algori
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<b>Submitter:</b> Ilya A. Burylov <b>Opened:</b> 2024-08-06 <b>Last modified:</b> 2024-11-28</p>
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<p><b>Priority: </b>1
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</p>
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<p><b>View other</b> <a href="lwg-index-open.html#rand.eng.philox">active issues</a> in [rand.eng.philox].</p>
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<p><b>View all other</b> <a href="lwg-index.html#rand.eng.philox">issues</a> in [rand.eng.philox].</p>
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<p><b>View all issues with</b> <a href="lwg-status.html#WP">WP</a> status.</p>
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<p><b>Discussion:</b></p>

‎issue4153.html‎

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@@ -67,6 +67,7 @@ <h3 id="4153"><a href="lwg-defects.html#4153">4153</a>. Fix extra "-1" for <code
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<b>Submitter:</b> Ruslan Arutyunyan <b>Opened:</b> 2024-09-18 <b>Last modified:</b> 2024-11-28</p>
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<p><b>Priority: </b>Not Prioritized
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</p>
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<p><b>View other</b> <a href="lwg-index-open.html#rand.eng.philox">active issues</a> in [rand.eng.philox].</p>
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<p><b>View all other</b> <a href="lwg-index.html#rand.eng.philox">issues</a> in [rand.eng.philox].</p>
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<p><b>View all issues with</b> <a href="lwg-status.html#WP">WP</a> status.</p>
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<p><b>Discussion:</b></p>

‎issue4212.html‎

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@@ -67,6 +67,7 @@ <h3 id="4212"><a href="lwg-active.html#4212">4212</a>. Make the round states in
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<b>Submitter:</b> Thomas Köppe <b>Opened:</b> 2025-02-12 <b>Last modified:</b> 2025-02-24</p>
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<p><b>Priority: </b>Not Prioritized
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</p>
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<p><b>View other</b> <a href="lwg-index-open.html#rand.eng.philox">active issues</a> in [rand.eng.philox].</p>
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<p><b>View all other</b> <a href="lwg-index.html#rand.eng.philox">issues</a> in [rand.eng.philox].</p>
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<p><b>View all issues with</b> <a href="lwg-status.html#New">New</a> status.</p>
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<p><b>Discussion:</b></p>

‎issue4224.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>Issue 4224: Philox engines should be freestanding</title>
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<meta property="og:title" content="Issue 4224: Philox engines should be freestanding">
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<meta property="og:description" content="C++ library issue. Status: New">
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<meta property="og:url" content="https://cplusplus.github.io/LWG/issue4224.html">
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<meta property="og:type" content="website">
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<meta property="og:image" content="http://cplusplus.github.io/LWG/images/cpp_logo.png">
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<meta property="og:image:alt" content="C++ logo">
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<style>
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p {text-align:justify}
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li {text-align:justify}
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pre code.backtick::before { content: "`" }
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pre code.backtick::after { content: "`" }
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blockquote.note
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{
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background-color:#E0E0E0;
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padding-left: 15px;
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padding-right: 15px;
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padding-top: 1px;
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padding-bottom: 1px;
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}
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ins {background-color:#A0FFA0}
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del {background-color:#FFA0A0}
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table.issues-index { border: 1px solid; border-collapse: collapse; }
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table.issues-index th { text-align: center; padding: 4px; border: 1px solid; }
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table.issues-index td { padding: 4px; border: 1px solid; }
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table.issues-index td:nth-child(1) { text-align: right; }
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table.issues-index td:nth-child(2) { text-align: left; }
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table.issues-index td:nth-child(3) { text-align: left; }
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table.issues-index td:nth-child(4) { text-align: left; }
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table.issues-index td:nth-child(5) { text-align: center; }
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table.issues-index td:nth-child(6) { text-align: center; }
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table.issues-index td:nth-child(7) { text-align: left; }
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table.issues-index td:nth-child(5) span.no-pr { color: red; }
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@media (prefers-color-scheme: dark) {
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html {
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color: #ddd;
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background-color: black;
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}
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ins {
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background-color: #225522
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}
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del {
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background-color: #662222
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}
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a {
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color: #6af
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}
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a:visited {
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color: #6af
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}
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blockquote.note
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background-color: rgba(255, 255, 255, .10)
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}
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}
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</style>
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</head>
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<body>
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<hr>
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<p><em>This page is a snapshot from the LWG issues list, see the <a href="lwg-active.html">Library Active Issues List</a> for more information and the meaning of <a href="lwg-active.html#New">New</a> status.</em></p>
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<h3 id="4224"><a href="lwg-active.html#4224">4224</a>. Philox engines should be freestanding</h3>
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<p><b>Section:</b> 29.5.4.5 <a href="https://wg21.link/rand.eng.philox">[rand.eng.philox]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Jiang An <b>Opened:</b> 2025-03-15 <b>Last modified:</b> 2025-03-15</p>
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<p><b>Priority: </b>Not Prioritized
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</p>
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<p><b>View other</b> <a href="lwg-index-open.html#rand.eng.philox">active issues</a> in [rand.eng.philox].</p>
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<p><b>View all other</b> <a href="lwg-index.html#rand.eng.philox">issues</a> in [rand.eng.philox].</p>
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<p><b>View all issues with</b> <a href="lwg-status.html#New">New</a> status.</p>
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<p><b>Discussion:</b></p>
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<p>
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Philox engines don't seem to require floating-point operations or support from the operating system,
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so they are probably suitable for freestanding. However, as <a href="https://wg21.link/P2976R1" title=" Freestanding Library: algorithm, numeric, and random">P2976R1</a> was finished before
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the adoption of <a href="https://wg21.link/P2075R6" title=" Philox as an extension of the C++ RNG engines">P2075R6</a>, these engines are not made freestanding yet.
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</p>
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<p id="res-4224"><b>Proposed resolution:</b></p>
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<p>
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This wording is relative to <a href="https://wg21.link/N5001">N5001</a>.
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</p>
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<ol>
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<li><p>Modify 29.5.2 <a href="https://wg21.link/rand.synopsis">[rand.synopsis]</a>, header <code>&lt;random&gt;</code> synopsis, as indicated:</p>
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<blockquote>
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<pre>
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[&hellip;]
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// <i>29.5.4.5 <a href="https://wg21.link/rand.eng.philox">[rand.eng.philox]</a>, class template philox_engine</i>
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template&lt;class UIntType, size_t w, size_t n, size_t r, UIntType... consts&gt;
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class philox_engine; <ins>// <i>partially freestanding</i></ins>
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[&hellip;]
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using philox4x32 = <i>see below</i>; <ins>// <i>freestanding</i></ins>
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using philox4x64 = <i>see below</i>; <ins>// <i>freestanding</i></ins>
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[&hellip;]
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</pre>
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</blockquote>
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</li>
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<li><p>Modify 29.5.4.5 <a href="https://wg21.link/rand.eng.philox">[rand.eng.philox]</a>, class template <code class='backtick'>philox_engine</code> synopsis, as indicated:</p>
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<blockquote>
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<pre>
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namespace std {
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template&lt;class UIntType, size_t w, size_t n, size_t r, UIntType... consts&gt;
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class philox_engine {
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[&hellip;]
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// <i>inserters and extractors</i>
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template&lt;class charT, class traits&gt;
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friend basic_ostream&lt;charT, traits&gt;&amp;
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operator&lt;&lt;(basic_ostream&lt;charT, traits&gt;&amp; os, const philox_engine&amp; x); <ins>// <i>hosted</i></ins>
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template&lt;class charT, class traits&gt;
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friend basic_istream&lt;charT, traits&gt;&amp;
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operator&gt;&gt;(basic_istream&lt;charT, traits&gt;&amp; is, philox_engine&amp; x); <ins>// <i>hosted</i></ins>
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};
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}
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</pre>
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</blockquote>
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</li>
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</ol>
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</body>
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</html>

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