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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - error code for broken_promise is incorrect & inconsistent with thrown future_error exception"
href="https://llvm.org/bugs/show_bug.cgi?id=23379">23379</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>error code for broken_promise is incorrect & inconsistent with thrown future_error exception
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</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>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vlovich@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, mclow.lists@gmail.com
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Broken promises on futures have an error code of 0 which results in the weird
result that std::future_errc::broken_promise isn't comparable to any exception
thrown, contrary to the standard specification & all the examples I've found
online.
Steps:
1.
// test.cpp
#include <future>
#include <iostream>
int main()
{
std::future<void> f;
{
std::promise<void> p;
f = p.get_future();
}
try {
f.get();
std::cerr << "Shouldn't get here?\n";
} catch(const std::future_error& e) {
bool is_broken_promise = e.code() ==
std::make_error_condition(std::future_errc::broken_promise);
std::cout << e.code().message() << "\n";
std::cout << e.code().value() << "\n";
std::cout << is_broken_promise << "\n";
}
}
2. clang++ -std=c++11 -stdlib=libc++ test.cpp && ./a.out
3. clang++ -std=c++14 -stdlib=libc++ test.cpp && ./a.out
Actual for both 2 & 3:
The associated promise has been destructed prior to the associated state
becoming ready.
0
0
Expected for #2:
The associated promise has been destructed prior to the associated state
becoming ready.
0
1
or
The associated promise has been destructed prior to the associated state
becoming ready.
0
1
Expected for #3:
The associated promise has been destructed prior to the associated state
becoming ready.
4
1</pre>
</div>
</p>
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