xo-arena: annex ArenaConfig.hpp from xo-alloc2/

include/xo/alloc2/arena/ArenaConfig.hpp

@@ -1,47 +0,0 @@
-/** @file ArenaConfig.hpp
- *
- *  @author Roland Conybeare, Dec 2025
- **/
-
-#pragma once
-
-#include "AllocHeaderConfig.hpp"
-#include <string>
-#include <cstdint>
-
-namespace xo {
-    namespace mm {
-
-        /** @class ArenaConfig
-         *
-         *  @brief configuration for a @ref DArena instance
-         **/
-        struct ArenaConfig {
-            /** @defgroup mm-arenaconfig-instance-vars ArenaConfig members **/
-            ///@{
-
-            /** optional name, for diagnostics **/
-            std::string name_;
-            /** desired arena size -- hard max = reserved virtual memory **/
-            std::size_t size_ = 0;
-            /** hugepage size -- using huge pages relieves some TLB pressure
-             *  (provided you use their full extent :)
-             **/
-            std::size_t hugepage_z_ = 2 * 1024 * 1024;
-            /** true to store header (8 bytes) at the beginning of each allocation.
-             *  necessary and sufficient to allows iterating over allocs
-             *  present in arena
-             **/
-            bool store_header_flag_ = false;
-            /** configuration for per-alloc header **/
-            AllocHeaderConfig header_{};
-            /** true to enable debug logging **/
-            bool debug_flag_ = false;
-
-            ///@}
-        };
-
-    } /*namespace mm*/
-} /*namespace xo*/
-
-/* end ArenaConfig.hpp */