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gvariant: Add example to docs for g_variant_builder_open()

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Try to clarify that the type is the type of the container, not of the
items with in it; and give an example of how to use it for nested types.

https://bugzilla.gnome.org/show_bug.cgi?id=777592
This commit is contained in:
Philip Withnall 2017-01-21 23:42:20 +00:00 committed by Philip Withnall
parent a6e2213343
commit b001f59206
1 changed files with 32 additions and 2 deletions
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34
glib/gvariant.c
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@ -3513,15 +3513,45 @@ g_variant_builder_add_value (GVariantBuilder *builder,
/**
* g_variant_builder_open:
* @builder: a #GVariantBuilder
* @type: a #GVariantType
* @type: the #GVariantType of the container
*
* Opens a subcontainer inside the given @builder. When done adding
* items to the subcontainer, g_variant_builder_close() must be called.
* items to the subcontainer, g_variant_builder_close() must be called. @type
* is the type of the container: so to build a tuple of several values, @type
* must include the tuple itself.
*
* It is an error to call this function in any way that would cause an
* inconsistent value to be constructed (ie: adding too many values or
* a value of an incorrect type).
*
* Example of building a nested variant:
* |[<!-- language="C" -->
* GVariantBuilder builder;
* guint32 some_number = get_number ();
* g_autoptr (GHashTable) some_dict = get_dict ();
* GHashTableIter iter;
* const gchar *key;
* const GVariant *value;
* g_autoptr (GVariant) output = NULL;
*
* g_variant_builder_init (&builder, G_VARIANT_TYPE ("(ua{sv})"));
* g_variant_builder_add (&builder, "u", some_number);
* g_variant_builder_open (&builder, G_VARIANT_TYPE ("a{sv}"));
*
* g_hash_table_iter_init (&iter, some_dict);
* while (g_hash_table_iter_next (&iter, (gpointer *) &key, (gpointer *) &value))
* {
* g_variant_builder_open (&builder, G_VARIANT_TYPE ("{sv}"));
* g_variant_builder_add (&builder, "s", key);
* g_variant_builder_add (&builder, "v", value);
* g_variant_builder_close (&builder);
* }
*
* g_variant_builder_close (&builder);
*
* output = g_variant_builder_end (&builder);
* ]|
*
* Since: 2.24
**/
void