Add full support for opaque values with ownership for unimplemented types.

Author: viferga

source/metacall/include/metacall/metacall_value.h

@@ -305,6 +305,44 @@ METACALL_API size_t metacall_value_count(void * v);
 */
 METACALL_API enum metacall_value_id metacall_value_id(void * v);
 
+/**
+*  @brief
+*    Returns the owner of the value, useful for lifecycles
+*
+*  @param[in] v
+*    Reference to the value
+*
+*  @return
+*    Pointer to the owner of the value,
+*    null means the value is not owned by anybody
+*/
+METACALL_API void * metacall_value_owner(void * v);
+
+/**
+*  @brief
+*    Set up the value ownership, overwrites the previous owner
+*
+*  @param[in] v
+*    Reference to the value
+*
+*  @param[in] owner
+*    Reference to the new owner
+*/
+METACALL_API void metacall_value_own(void * v, void * owner);
+
+/**
+*  @brief
+*    Deep copies the value @v, the result copy resets
+*    the reference counter and ownership
+*
+*  @param[in] v
+*    Reference to the value to be copied
+*
+*  @return
+*    Copy of the value @v on success, null otherwhise
+*/
+METACALL_API void * metacall_value_copy(void * v);
+
 /**
 *  @brief
 *    Convert value @v to boolean

source/metacall/source/metacall_value.c

@@ -179,6 +179,21 @@ enum metacall_value_id metacall_value_id(void * v)
 	return METACALL_INVALID;
 }
 
+void * metacall_value_owner(value v)
+{
+	return value_owner(v);
+}
+
+void metacall_value_own(value v, void * owner)
+{
+	value_own(v, owner);
+}
+
+void * metacall_value_copy(void * v)
+{
+	return value_type_copy(v);
+}
+
 boolean metacall_value_to_bool(void * v)
 {
 	assert(value_type_id(v) == TYPE_BOOL);