Method
GObjectObjectreplace_data
since: 2.34
Declaration [src]
gboolean
g_object_replace_data (
GObject* object,
const gchar* key,
gpointer oldval,
gpointer newval,
GDestroyNotify destroy,
GDestroyNotify* old_destroy
)
Description [src]
Compares the user data for the key key on object with
oldval, and if they are the same, replaces oldval with
newval.
This is like a typical atomic compare-and-exchange operation, for user data on an object.
If the previous value was replaced then ownership of the
old value (oldval) is passed to the caller, including
the registered destroy notify for it (passed out in old_destroy).
It’s up to the caller to free this as needed, which may
or may not include using old_destroy as sometimes replacement
should not destroy the object in the normal way.
See g_object_set_data() for guidance on using a small, bounded set of values
for key.
Available since: 2.34
This method is not directly available to language bindings.
Parameters
key-
Type:
const gchar*A string, naming the user data pointer.
The data is owned by the caller of the method. The value is a NUL terminated UTF-8 string. oldval-
Type:
gpointerThe old value to compare against.
The argument can be NULL.The data is owned by the caller of the method. newval-
Type:
gpointerThe new value.
The argument can be NULL.The data is owned by the caller of the method. destroy-
Type:
GDestroyNotifyA destroy notify for the new value.
The argument can be NULL. old_destroy-
Type:
GDestroyNotifyDestroy notify for the existing value.
The argument will be set by the function. The argument can be NULL.The returned data is owned by the instance.