xo-alloc2: header reorg + DX1Collector utest

src/alloc2/DX1Collector.cpp

@@ -0,0 +1,36 @@
+/** @file DX1Collector.cpp
+ *
+ *  @author Roland Conybeare, Dec 2025
+ **/
+
+#include "gc/DX1Collector.hpp"
+#include <cassert>
+
+namespace xo {
+    namespace mm {
+        DX1Collector::DX1Collector(const CollectorConfig & cfg) : config_{cfg}
+        {
+            for (uint32_t igen = 0, ngen = cfg.n_generation_; igen < ngen; ++igen) {
+                space_storage_[0][igen] = std::move(DArena::map(cfg.arena_config_));
+                space_storage_[1][igen] = std::move(DArena::map(cfg.arena_config_));
+
+                space_[role::to_space()][igen] = &space_storage_[0][igen];
+                space_[role::from_space()][igen] = &space_storage_[1][igen];
+            }
+
+            for (uint32_t igen = cfg.n_generation_; igen < c_max_generation; ++igen) {
+                space_[role::to_space()][igen] = nullptr;
+                space_[role::from_space()][igen] = nullptr;
+            }
+        }
+
+        void
+        DX1Collector::reverse_roles(generation g) {
+            assert(g < config_.n_generation_);
+
+            std::swap(space_[0][g], space_[1][g]);
+        }
+    } /*namespace mm*/
+} /*namespace xo*/
+
+/* end DX1Collector.cpp */