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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - std::fstream still good after closing and updating content"
href="https://bugs.llvm.org/show_bug.cgi?id=38052">38052</a>
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<th>Summary</th>
<td>std::fstream still good after closing and updating content
</td>
</tr>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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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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</tr>
<tr>
<th>Reporter</th>
<td>grene@web.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
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<div>
<pre>I have a simple program that should show the problem. - with libc++ the stream
is still good after closing and further operation. Since also the file content
was not updated - at least the stream operation fails on the closed stream and
should set either failbit or badbit to reflect the situation.
#include <iostream>
#include <fstream>
int main(int argc, const char * argv[])
{
std::fstream ofs("test.txt", std::ios::out | std::ios::trunc);
ofs << "Hello, World!\n";
ofs.close();
ofs << "Hello, World!\n";
std::cout << "good(): " << ofs.good()
<< " fail(): " << ofs.fail()
<< " bad(): " << ofs.bad()
<< " eof(): " << ofs.eof() << std::endl;
return 0;
}
// <a href="http://coliru.stacked-crooked.com/a/cfaeb32849c9cfad">http://coliru.stacked-crooked.com/a/cfaeb32849c9cfad</a>
With libc++ I get
good(): 1 fail(): 0 bad(): 0 eof(): 0
Expected (or with libstdc++):
good(): 0 fail(): 1 bad(): 1 eof(): 0
I have tested on OSX with Xcode 9.4.1
Apple LLVM version 9.1.0 (clang-902.0.39.2)
or on Linux:
clang version 3.8.0</pre>
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