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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Crash while capture template std::function in lambdas"
href="http://llvm.org/bugs/show_bug.cgi?id=21664">21664</a>
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</tr>
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<th>Summary</th>
<td>Crash while capture template std::function in lambdas
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.4
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++11
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>kamil.rojewski@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>When trying to capture a template std::function alias in a lambda by value, I
am experiencing a crash in the resulting binary. Here is a code snippet showing
this error:
#include <functional>
template<class T>
using Callback = std::function<void (T)>;
std::function<void ()> f(const Callback<int> &callback)
{
return [=] {
callback(0); // crash here
};
}
int main()
{
auto lambda = f([](int) { });
lambda();
return 0;
}
This also happens when explicitly capturing "callback". To work around the
crash, the variable needs to be captured using generalized capture:
#include <functional>
template<class T>
using Callback = std::function<void (T)>;
std::function<void ()> f(const Callback<int> &callback)
{
return [=, callback = callback] {
callback(0); // no crash now
};
}
int main()
{
auto lambda = f([](int) { });
lambda();
return 0;
}</pre>
</div>
</p>
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