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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - std::invoke fails to call noexcept marked function"
href="https://bugs.llvm.org/show_bug.cgi?id=37407">37407</a>
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<th>Summary</th>
<td>std::invoke fails to call noexcept marked function
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<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>enhancement
</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>blitzrakete@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
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<pre>std::invoke wrongly takes the partial specialization for objects instead for
functions for functions marked with noexcept. I'm on r331914.
#include <functional>
void func() noexcept {}
int main() { std::invoke(func); }
Here's the full error message:
In file included from main.cpp:1:
In file included from /usr/local/bin/../include/c++/v1/functional:484:
/usr/local/bin/../include/c++/v1/type_traits:4196:19: error: invalid
application of 'sizeof' to a function type
static_assert(sizeof(_Tp) > 0, Type must be complete.);
^~~~~~~~~~~
/usr/local/bin/../include/c++/v1/type_traits:4201:15: note: in instantiation of
template class 'std::__1::__check_complete<void () noexcept>' requested here
: private __check_complete<_Tp>
^
/usr/local/bin/../include/c++/v1/type_traits:4494:15: note: in instantiation of
template class 'std::__1::__check_complete<void (&)() noexcept>' requested here
: private __check_complete<_Fp>
^
/usr/local/bin/../include/c++/v1/type_traits:4557:9: note: in instantiation of
template class 'std::__1::__invokable_r<void, void (&)() noexcept>' requested
here
__invokable<_Fp, _Args...>::value,
^
/usr/local/bin/../include/c++/v1/type_traits:4566:14: note: in instantiation of
template class 'std::__1::__invoke_of<void (&)() noexcept>' requested here
: public __invoke_of<_Fp, _Args...>
^
/usr/local/bin/../include/c++/v1/type_traits:4571:22: note: in instantiation of
template class 'std::__1::result_of<void (&())() noexcept>' requested here
template <class _Tp> using result_of_t = typename result_of<_Tp>::type;
^
/usr/local/bin/../include/c++/v1/functional:2346:1: note: in instantiation of
template type alias 'result_of_t' requested here
result_of_t<_Fn&&(_Args&&...)>
^
main.cpp:5:14: note: while substituting deduced template arguments into
function template 'invoke' [with _Fn = void (&)() noexcept, _Args = <>]
int main() { std::invoke(func); }
^
1 error generated.</pre>
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