xo-object2: GCObjectConversion for double (via DFloat)

xo-object2/src/object2/GCObjectConversion_DFloat.cpp

@@ -0,0 +1,41 @@
+/** @file GCObjectConversion_DFloat.cpp
+ *
+ *  @author Roland Conybeare, Jan 2026
+ **/
+
+#include "number/GCObjectConversion_DFloat.hpp"
+#include <xo/indentlog/print/tag.hpp>
+
+namespace xo {
+    using xo::mm::AGCObject;
+
+    namespace scm {
+
+        obj<AGCObject>
+        GCObjectConversion<double>::to_gco(obj<AAllocator> mm,
+                                           const double & x)
+        {
+            return DFloat::box<AGCObject>(mm, x);
+        }
+
+        double
+        GCObjectConversion<double>::from_gco(obj<AAllocator> mm,
+                                             obj<AGCObject> gco)
+        {
+            (void)mm;
+
+            auto float_obj = obj<AGCObject,DFloat>::from(gco);
+
+            if (!float_obj) {
+                throw std::runtime_error
+                    (tostr("Object obj found where Float expected",
+                           xtag("obj", gco)));
+            }
+
+            return float_obj.data()->value();
+        }
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end GCObjectConversion_DFloat.cpp */