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gtype: Add a "final" flag

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We want to have the ability to mark types that should not be derivable
even if they are in a deeply derivable type hierarchy; in other words,
leaf nodes in the types tree.
This commit is contained in:
Emmanuele Bassi 2021-02-09 10:45:00 +00:00
parent 808cde540a
commit c07dd416cf
2 changed files with 25 additions and 3 deletions
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9
gobject/gtype.c
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@ -143,7 +143,7 @@
G_TYPE_FLAG_INSTANTIATABLE | \
G_TYPE_FLAG_DERIVABLE | \
G_TYPE_FLAG_DEEP_DERIVABLE)
#define TYPE_FLAG_MASK (G_TYPE_FLAG_ABSTRACT | G_TYPE_FLAG_VALUE_ABSTRACT)
#define TYPE_FLAG_MASK (G_TYPE_FLAG_ABSTRACT | G_TYPE_FLAG_VALUE_ABSTRACT | G_TYPE_FLAG_FINAL)
#define SIZEOF_FUNDAMENTAL_INFO ((gssize) MAX (MAX (sizeof (GTypeFundamentalInfo), \
sizeof (gpointer)), \
sizeof (glong)))
@ -804,6 +804,13 @@ check_derivation_I (GType parent_type,
NODE_NAME (pnode));
return FALSE;
}
if ((G_TYPE_FLAG_FINAL & GPOINTER_TO_UINT (type_get_qdata_L (pnode, static_quark_type_flags))) == G_TYPE_FLAG_FINAL)
{
g_warning ("cannot derive '%s' from final parent type '%s'",
type_name,
NODE_NAME (pnode));
return FALSE;
}
return TRUE;
}

19
gobject/gtype.h
View File

@ -370,6 +370,18 @@ G_BEGIN_DECLS
* Returns: %TRUE on success
*/
#define G_TYPE_HAS_VALUE_TABLE(type) (g_type_value_table_peek (type) != NULL)
/**
* G_TYPE_IS_FINAL:
* @type: a #GType value
*
* Checks if @type is a final type. A final type cannot be derived any
* further.
*
* Returns: %TRUE on success
*
* Since: 2.70
*/
#define G_TYPE_IS_FINAL(type) (g_type_test_flags ((type), G_TYPE_FLAG_FINAL)) GLIB_AVAILABLE_MACRO_IN_2_70
/* Typedefs
@ -1002,13 +1014,16 @@ typedef enum /*< skip >*/
* @G_TYPE_FLAG_VALUE_ABSTRACT: Indicates an abstract value type, i.e. a type
* that introduces a value table, but can't be used for
* g_value_init()
* @G_TYPE_FLAG_FINAL: Indicates a final type. A final type is a non-derivable
* leaf node in a deep derivable type hierarchy tree. Since: 2.70
*
* Bit masks used to check or determine characteristics of a type.
*/
typedef enum /*< skip >*/
{
G_TYPE_FLAG_ABSTRACT = (1 << 4),
G_TYPE_FLAG_VALUE_ABSTRACT = (1 << 5)
G_TYPE_FLAG_ABSTRACT = (1 << 4),
G_TYPE_FLAG_VALUE_ABSTRACT = (1 << 5),
G_TYPE_FLAG_FINAL GLIB_AVAILABLE_ENUMERATOR_IN_2_70 = (1 << 6)
} GTypeFlags;
/**
* GTypeInfo: