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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 --- - std::bind const-qualifying bound arguments captured by value when compiled as C++14"
href="https://llvm.org/bugs/show_bug.cgi?id=23141">23141</a>
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</tr>
<tr>
<th>Summary</th>
<td>std::bind const-qualifying bound arguments captured by value when compiled as C++14
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
<tr>
<th>Version</th>
<td>3.6
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</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>eniebler@boost.org
</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>The following code fails to compile when compiled as C++14:
#include <functional>
#include <type_traits>
struct Fun
{
template<typename T, typename U>
void operator()(T && t, U && u) const
{
static_assert(std::is_same<U, int &>::value, "");
}
};
int main()
{
std::bind(Fun{}, std::placeholders::_1, 42)("hello");
}
The error is:
static_assert(std::is_same<U, int &>::value, "");
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/clang-trunk/bin/../include/c++/v1/__functional_base:415:12: note: in
instantiation of function template specialization
'Fun::operator()<char const (&)[6], const int &>' requested here
return _VSTD::forward<_Fp>(__f)(_VSTD::forward<_Args>(__args)...);
^
/usr/local/clang-trunk/bin/../include/c++/v1/__config:381:15: note: expanded
from macro '_VSTD'
#define _VSTD std::_LIBCPP_NAMESPACE
^
1 error generated.
When compiled as C++11, the code compiles successfully.</pre>
</div>
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