xo-object2: + DArray [WIP] + utest

src/object2/DArray.cpp

@@ -0,0 +1,53 @@
+/** @file DArray.cpp
+*
+ *  @author Roland Conybeare, Jan 2026
+ **/
+
+#include "DArray.hpp"
+
+namespace xo {
+    using xo::mm::AGCObject;
+    using xo::facet::typeseq;
+
+    namespace scm {
+        DArray *
+        DArray::empty(obj<AAllocator> mm,
+                      size_type cap)
+        {
+            assert(cap > 0);
+
+            DArray * result = nullptr;
+
+            if (cap > 0) {
+                void * mem = mm.alloc(typeseq::id<DArray>(),
+                                      sizeof(DArray) + cap * sizeof(obj<AGCObject>));
+
+                result = new (mem) DArray();
+
+                assert(result);
+
+                result->capacity_ = cap;
+                result->size_ = 0;
+            }
+
+            return result;
+        }
+
+        bool
+        DArray::push_back(obj<AGCObject> elt) noexcept {
+            if (size_ >= capacity_) {
+                return false;
+            } else {
+                static_assert(!std::is_trivially_constructible_v<obj<AGCObject>>);
+
+                void * mem = &(elts_[size_]);
+
+                new (mem) obj<AGCObject>(elt);
+
+                ++(this->size_);
+
+                return true;
+            }
+        }
+    } /*namespace scm*/
+} /*namespace xo*/