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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - std::ws sets failbit at eof"
href="http://llvm.org/bugs/show_bug.cgi?id=19497">19497</a>
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<th>Summary</th>
<td>std::ws sets failbit at eof
</td>
</tr>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>3.3
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>FreeBSD
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>shurd@sasktel.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, mclow.lists@gmail.com
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>When porting an application recently, I discovered that std::ws sets the
failbit if it is called when eofbit is set. This differs from the libstdc++
behaviour and there's a StackOverflow mention of it here:
<a href="http://stackoverflow.com/questions/13423514/should-stdws-raise-failbit-at-end-of-file">http://stackoverflow.com/questions/13423514/should-stdws-raise-failbit-at-end-of-file</a>
#include <iostream>
#include <sstream>
using namespace std;
int main(int argc, char **argv)
{
int i;
stringstream s("0");
s >> i >> std::ws;
cout << "eof: " << s.eof() << " fail: " << s.fail() << "\n";
return 0;
}
Output (c++ is FreeBSD Clang 3.3 and g++47 is GNU C++ 4.7):
<span class="quote">> c++ test.cpp
> ./a.out </span >
eof: 1 fail: 1
<span class="quote">> g++47 test.cpp
> ./a.out</span >
eof: 1 fail: 0</pre>
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