Merge pull request #2979 from QMCPACK/origin/update_multi_for_clang11…

…_second_try

Clang CUDA AFQMC workaround device_allocator by defining uninitialized_copy at the allocator level

src/AFQMC/Memory/device_pointers.hpp

@@ -420,17 +420,20 @@ struct device_allocator
   bool operator==(device_allocator const& other) const { return true; }
   bool operator!=(device_allocator const& other) const { return false; }
   template<class U, class... Args>
-  void construct(U p, Args&&... args)
-  {}
-  //{
-  //    ::new((void*)p) U(std::forward<Args>(args)...);
-  //  }
+  void construct(U p, Args&&... args){
+    static_assert( std::is_trivially_copy_constructible<value_type>{}, "!"); // ::new((void*)p) U(std::forward<Args>(args)...);
+  }
   template<class U>
-  void destroy(U p)
-  {}
-  //  {
-  //    p->~U();
-  //  }
+  void destroy(U p){
+		static_assert( std::is_trivially_destructible<value_type>{}, "!"); // p->~U();
+  }
+  template<class InputIt, class ForwardIt>
+  ForwardIt alloc_uninitialized_copy(InputIt first, InputIt last, ForwardIt d_first){
+		static_assert( std::is_trivially_copy_constructible<value_type>{}, "!");
+		static_assert( std::is_trivially_destructible<value_type>{}, "!");
+		std::advance( d_first , std::distance(first, last) );
+		return d_first;
+  }
 };
 
 struct memory_resource