<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Issue 2930: Are implementations allowed to split non-member functions into several overloads?</title>
<meta property="og:title" content="Issue 2930: Are implementations allowed to split non-member functions into several overloads?">
<meta property="og:description" content="C++ library issue. Status: NAD">
<meta property="og:url" content="https://cplusplus.github.io/LWG/issue2930.html">
<meta property="og:type" content="website">
<meta property="og:image" content="http://cplusplus.github.io/LWG/images/cpp_logo.png">
<meta property="og:image:alt" content="C++ logo">
<style>
  p {text-align:justify}
  li {text-align:justify}
  pre code.backtick::before { content: "`" }
  pre code.backtick::after { content: "`" }
  blockquote.note
  {
    background-color:#E0E0E0;
    padding-left: 15px;
    padding-right: 15px;
    padding-top: 1px;
    padding-bottom: 1px;
  }
  ins {background-color:#A0FFA0}
  del {background-color:#FFA0A0}
  table.issues-index { border: 1px solid; border-collapse: collapse; }
  table.issues-index th { text-align: center; padding: 4px; border: 1px solid; }
  table.issues-index td { padding: 4px; border: 1px solid; }
  table.issues-index td:nth-child(1) { text-align: right; }
  table.issues-index td:nth-child(2) { text-align: left; }
  table.issues-index td:nth-child(3) { text-align: left; }
  table.issues-index td:nth-child(4) { text-align: left; }
  table.issues-index td:nth-child(5) { text-align: center; }
  table.issues-index td:nth-child(6) { text-align: center; }
  table.issues-index td:nth-child(7) { text-align: left; }
  table.issues-index td:nth-child(5) span.no-pr { color: red; }
  @media (prefers-color-scheme: dark) {
     html {
        color: #ddd;
        background-color: black;
     }
     ins {
        background-color: #225522
     }
     del {
        background-color: #662222
     }
     a {
        color: #6af
     }
     a:visited {
        color: #6af
     }
     blockquote.note
     {
        background-color: rgba(255, 255, 255, .10)
     }
  }
</style>
</head>
<body>
<hr>
<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#NAD">NAD</a> status.</em></p>
<h3 id="2930"><a href="lwg-closed.html#2930">2930</a>. Are implementations allowed to split non-member functions into several overloads?</h3>
<p><b>Section:</b> 16.4.6.4 <a href="https://wg21.link/global.functions">[global.functions]</a> <b>Status:</b> <a href="lwg-active.html#NAD">NAD</a>
 <b>Submitter:</b> Morwenn <b>Opened:</b> 2017-02-04 <b>Last modified:</b> 2017-03-14</p>
<p><b>Priority: </b>Not Prioritized
</p>
<p><b>View all other</b> <a href="lwg-index.html#global.functions">issues</a> in [global.functions].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#NAD">NAD</a> status.</p>
<p><b>Discussion:</b></p>
<p>
Section 16.4.6.5 <a href="https://wg21.link/member.functions">[member.functions]</a> makes it clear that standard library implementers are allowed to "replace a 
member function with default arguments with two or more member functions with equivalent behavior". However, it is 
unclear when reading 16.4.6.4 <a href="https://wg21.link/global.functions">[global.functions]</a> whether implementers are allowed to perform the same transformation 
for non-member functions. 16.4.6.4 <a href="https://wg21.link/global.functions">[global.functions]</a> p3 mentions that "an implementation shall not declare a 
non-member function signature with additional default arguments", but does not explicitly forbid to replace a function 
with default arguments with more functions with equivalent behavior.
<p/>
The standard should make it clear whether such a transformation is conforming or not, probably through a note 
[global.functions].
<p/>
Link to the <a href="https://groups.google.com/a/isocpp.org/forum/#!topic/std-discussion/nOtuY0aXReE">Standard Discussion forum</a>.
</p>

<p><i>[2017-03-04, Kona]</i></p>

<p>We believe that [member.functions]p2 is clear.</p>


<p id="res-2930"><b>Proposed resolution:</b></p>
<p>
</p>






</body>
</html>
