Remove forwarding res to is_allocated on unique_resource_data constru…

…ction.

It is possible that the resource source will become moved-from after the
call to is_allocated, and that moved-from state will then be used to
initialize the resource in the resource_holder. To avoid this, don't
forward the resource source to is_allocated.

Fixes #10.

include/boost/scope/unique_resource.hpp

@@ -727,7 +727,7 @@ class unique_resource_data< Resource, Deleter, Traits, true > :
             std::is_nothrow_constructible< resource_holder, R, D, bool >,
             std::is_nothrow_constructible< deleter_holder, D, resource_type&, bool >
         >::value) :
-        unique_resource_data(static_cast< R&& >(res), static_cast< D&& >(del), traits_type::is_allocated(static_cast< R&& >(res)))
+        unique_resource_data(static_cast< R&& >(res), static_cast< D&& >(del), traits_type::is_allocated(res)) // don't forward res to is_allocated to make sure res is not moved-from on resource construction
     {
     }