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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Invalid error "exception specification of 'XXX' uses itself""
href="http://bugs.llvm.org/show_bug.cgi?id=32639">32639</a>
</td>
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<tr>
<th>Summary</th>
<td>Invalid error "exception specification of 'XXX' uses itself"
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>4.0
</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>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>officesamurai@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18275" name="attach_18275" title="test code (also in the text)">attachment 18275</a> <a href="attachment.cgi?id=18275&action=edit" title="test code (also in the text)">[details]</a></span>
test code (also in the text)
Compiling a seemingly innocent piece of code produces the error "exception
specification of 'XXX' uses itself".
test.cpp (also attached):
#include <type_traits>
template <typename T>
struct XXX
{
XXX() {}
XXX (XXX&&) noexcept(std::is_nothrow_move_constructible<T>::value) {}
};
struct S
{
S(XXX<int> = XXX<int>()) {}
S(S&&) noexcept = default;
XXX<int> x;
};
int main()
{
}
The command line:
~/tmp$ clang++-4.0 test.cpp -std=c++11 -stdlib=libc++ -o test
The result:
test.cpp:15:14: error: exception specification of 'XXX' uses itself
XXX<int> x;
^
test.cpp:15:14: note: in instantiation of exception specification for 'XXX'
requested here
/home/brd/soft/clang+llvm-4.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/../include/c++/v1/type_traits:1017:6:
note: in instantiation of template class 'std::__1::is_same<int &,
std::__1::__two>' requested here
!is_same<decltype(__is_referenceable_impl::__test<_Tp>(0)), __two>::value>
{};
^
/home/brd/soft/clang+llvm-4.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/../include/c++/v1/type_traits:1089:29:
note: in instantiation of template class 'std::__1::__is_referenceable<int>'
requested here
template <class _Tp, bool = __is_referenceable<_Tp>::value> struct
__add_rvalue_reference_impl { typedef _Tp type; };
^
/home/brd/soft/clang+llvm-4.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/../include/c++/v1/type_traits:1093:19:
note: in instantiation of default argument for
'__add_rvalue_reference_impl<int>' required here
{typedef typename __add_rvalue_reference_impl<_Tp>::type type;};
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/brd/soft/clang+llvm-4.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/../include/c++/v1/type_traits:3722:53:
note: in instantiation of template class 'std::__1::add_rvalue_reference<int>'
requested here
: public is_nothrow_constructible<_Tp, typename
add_rvalue_reference<_Tp>::type>
^
test.cpp:7:31: note: in instantiation of template class
'std::__1::is_nothrow_move_constructible<int>' requested here
XXX (XXX&&) noexcept(std::is_nothrow_move_constructible<T>::value) {}
^
test.cpp:12:16: note: in instantiation of exception specification for 'XXX'
requested here
S(XXX<int> = XXX<int>()) {}
^
test.cpp:13:5: error: exception specification of explicitly defaulted move
constructor does not match the calculated one
S(S&&) noexcept = default;
^
/home/brd/soft/clang+llvm-4.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/../include/c++/v1/type_traits:1017:6:
note: in instantiation of template class 'std::__1::is_same<int &,
std::__1::__two>' requested here
!is_same<decltype(__is_referenceable_impl::__test<_Tp>(0)), __two>::value>
{};
^
/home/brd/soft/clang+llvm-4.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/../include/c++/v1/type_traits:1089:29:
note: in instantiation of template class 'std::__1::__is_referenceable<int>'
requested here
template <class _Tp, bool = __is_referenceable<_Tp>::value> struct
__add_rvalue_reference_impl { typedef _Tp type; };
^
/home/brd/soft/clang+llvm-4.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/../include/c++/v1/type_traits:1093:19:
note: in instantiation of default argument for
'__add_rvalue_reference_impl<int>' required here
{typedef typename __add_rvalue_reference_impl<_Tp>::type type;};
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/brd/soft/clang+llvm-4.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/../include/c++/v1/type_traits:3722:53:
note: in instantiation of template class 'std::__1::add_rvalue_reference<int>'
requested here
: public is_nothrow_constructible<_Tp, typename
add_rvalue_reference<_Tp>::type>
^
test.cpp:7:31: note: in instantiation of template class
'std::__1::is_nothrow_move_constructible<int>' requested here
XXX (XXX&&) noexcept(std::is_nothrow_move_constructible<T>::value) {}
^
test.cpp:12:16: note: in instantiation of exception specification for 'XXX'
requested here
S(XXX<int> = XXX<int>()) {}
^
2 errors generated.
P.S. clang 3.9.1 is able to compile the code.</pre>
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