added CompileOptional Allocator variable to const_list

include/const_list.h

@@ -9,6 +9,7 @@
 #include <initializer_list>
 #include <iterator>
 #include "allocator.h"
+#include "CompileOptional.h"
 
 namespace cc {
 	
@@ -90,6 +91,11 @@ namespace cc {
 			const_list_node *_start;
             const_list_node *_end;
             std::size_t _size;
+			CompileOptional<Alloc, std::is_same_v<Alloc, statically_allocated>> _alloc;
+			
+			using alloc_defined = decltype(_alloc)::defined;
+
+		public:
 
             constexpr const_list() noexcept = default;
             constexpr explicit const_list(size_type count) noexcept;