<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - static method invocation via objects are not considered constexpr"
href="https://llvm.org/bugs/show_bug.cgi?id=31624">bug 31624</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>richard-llvm@metafoo.co.uk
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - static method invocation via objects are not considered constexpr"
href="https://llvm.org/bugs/show_bug.cgi?id=31624#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - static method invocation via objects are not considered constexpr"
href="https://llvm.org/bugs/show_bug.cgi?id=31624">bug 31624</a>
from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
<pre>Nope, GCC and CL are wrong. [expr.const]/2.10:
"[An expression is not a constant expression if it would evaluate] an
id-expression that refers to a variable or data member of reference type unless
the reference has a preceding initialization and either
— it is initialized with a constant expression or
— its lifetime began within the evaluation of e;"
Because the expression uses the name 'f' and that name cannot be evaluated, the
expression is not a constant expression. It doesn't matter that the callee is a
static function; evaluation of the LHS must succeed. Consider:
(something with arbitrary non-constant side effects, f).hasBar()
This is obviously not constant.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>