<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - improve error when binding to wrong placeholder"
href="https://llvm.org/bugs/show_bug.cgi?id=23047">23047</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>improve error when binding to wrong placeholder
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nlewycky@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>We should product a nice error message for this mistake:
#include <functional>
#include <string>
void Print(const std::string& a, const std::string& b, const std::string& c);
void test() {
std::function<void(const std::string&)> func =
std::bind(&Print, "aaa", std::placeholders::_2, "ccc");
func("garbage");
}
I'm not going to paste the template spew we get with libstdc++ today. I don't
know what we get with libc++.
What I want is an error message along the lines of "tried to use _2 placeholder
for a 1 argument function type". I'm not sure whether this should be strictly
in the compiler, or whether we can have collusion with the library
implementation.</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>