Partially revert r12-4190-g6da36b7d0e43b6f9281c65c19a025d4888a25b2d
because using __and_<..., is_copy_constructible<T>> when T is incomplete
results in an error about deriving from is_copy_constructible<T> when
that is incomplete. I don't know how to fix that, so this simply
restores the previous constraint which worked in this case (even though
I think it's technically undefined to use is_copy_constructible<T> with
incomplete T). This doesn't restore exactly what we had before, but uses
the is_copy_constructible_v and __is_in_place_type_v variable templates
instead of the ::value member.
libstdc++-v3/ChangeLog:
PR libstdc++/104242
* include/std/any (any(T&&)): Revert change to constraints.
* testsuite/20_util/any/cons/104242.cc: New test.
/// Construct with a copy of @p __value as the contained object.
template <typename _Tp, typename _VTp = _Decay_if_not_any<_Tp>,
typename _Mgr = _Manager<_VTp>,
- typename = _Require<__not_<__is_in_place_type<_VTp>>,
- is_copy_constructible<_VTp>>>
+ enable_if_t<is_copy_constructible_v<_VTp>
+ && !__is_in_place_type_v<_VTp>, bool> = true>
any(_Tp&& __value)
: _M_manager(&_Mgr::_S_manage)
{
--- /dev/null
+// { dg-do compile { target c++17 } }
+
+// PR libstdc++/104242 - Class with constructor from std::any is not copyable
+
+#include <any>
+#include <type_traits>
+
+struct A {
+ A(const A&) = default;
+ explicit A(std::any value);
+};
+static_assert(std::is_copy_constructible_v<A>);