xo-interpreter: Object->TaggedPtr conversion (prep for primitives)

include/xo/alloc/Blob.hpp

@@ -0,0 +1,40 @@
+/** @file Blob.hpp
+ *
+ *  @author Roland Conybeare, Nov 2025
+ **/
+
+#pragma once
+
+#include "Object.hpp"
+#include "IAlloc.hpp"
+
+namespace xo {
+    /** Use to allocate opaque binary data,
+     *  with object header.
+     *
+     *  Not sure if we want to bother implementing reflection for this...
+     **/
+    class Blob : public Object {
+    public:
+        Blob(std::size_t z) : z_{z} {};
+
+        static gp<Blob> make(gc::IAlloc * mm, std::size_t z);
+
+        std::size_t size() const { return z_; }
+        std::byte * data() { return data_; }
+
+        virtual TaggedPtr self_tp() const final override;
+        virtual void display(std::ostream & os) const final override;
+
+        virtual std::size_t _shallow_size() const final override;
+        virtual Object * _shallow_copy(gc::IAlloc * gc) const final override;
+        virtual std::size_t _forward_children(gc::IAlloc * gc) final override;
+
+    private:
+        std::size_t z_ = 0;
+        /** flexible array, with @ref z_ bytes **/
+        std::byte data_[];
+    };
+}
+
+/* end Blob.hpp */