Re: Function completion for GVariant maybe types?

[Markus Elfring <Markus Elfring web de>]

> I imagine that this approach might need a bit more fine-tuning to avoid
> unnecessary type checks.

Would the following implementation be useful in your software library?

diff --git a/glib/gvariant.c b/glib/gvariant.c
index c3d1947..ffa67da 100644
--- a/glib/gvariant.c
+++ b/glib/gvariant.c
@@ -682,6 +682,23 @@ g_variant_new_maybe (const GVariantType *child_type,
   return value;
 }

+GVariant *
+g_variant_new_nothing_from_type (GVariant const * value)
+{
+  if (value == NULL)
+     return g_variant_new ("ms", NULL);
+  else
+    {
+      GVariantType const * const type = g_variant_get_type (value);
+      gchar const * type_string = (gchar const *) type;
+
+      if (*type_string == 'm')
+          return g_variant_new_maybe ((GVariantType const *) ++type_string, NULL);
+      else
+          return g_variant_new_maybe (type, NULL);
+    }
+}
+
 /**
  * g_variant_get_maybe:
  * @value: a maybe-typed value


Regards,
Markus