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docs: Document that signal connection functions cannot fail

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The documentation previously implied that they could. That’s not really
true though: they can only fail if preconditions fail, i.e. they’re
passed invalid input. That’s a programmer error, which is not something
we want to encourage people to check for at runtime (e.g. by dynamically
checking for a 0 return value).

Signed-off-by: Philip Withnall <pwithnall@gnome.org>
This commit is contained in:
Philip Withnall 2024-03-06 13:25:38 +00:00
parent fafe1a14a8
commit a60e6bedae
2 changed files with 24 additions and 6 deletions
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15
gobject/gsignal.c
View File

@ -2301,7 +2301,10 @@ g_signal_get_invocation_hint (gpointer instance)
* If @closure is a floating reference (see g_closure_sink()), this function
* takes ownership of @closure.
*
* Returns: the handler ID (always greater than 0 for successful connections)
* This function cannot fail. If the given signal doesn’t exist, a critical
* warning is emitted.
*
* Returns: the handler ID (always greater than 0)
*/
gulong
g_signal_connect_closure_by_id (gpointer instance,
@ -2366,7 +2369,10 @@ g_signal_connect_closure_by_id (gpointer instance,
* If @closure is a floating reference (see g_closure_sink()), this function
* takes ownership of @closure.
*
* Returns: the handler ID (always greater than 0 for successful connections)
* This function cannot fail. If the given signal doesn’t exist, a critical
* warning is emitted.
*
* Returns: the handler ID (always greater than 0)
*/
gulong
g_signal_connect_closure (gpointer instance,
@ -2462,7 +2468,10 @@ node_check_deprecated (const SignalNode *node)
* used. Specify @connect_flags if you need `..._after()` or
* `..._swapped()` variants of this function.
*
* Returns: the handler ID (always greater than 0 for successful connections)
* This function cannot fail. If the given signal doesn’t exist, a critical
* warning is emitted.
*
* Returns: the handler ID (always greater than 0)
*/
gulong
g_signal_connect_data (gpointer instance,

15
gobject/gsignal.h
View File

@ -508,7 +508,10 @@ void g_signal_chain_from_overridden_handler (gpointer instance,
* See [memory management of signal handlers](signals.html#Memory_management_of_signal_handlers) for
* details on how to handle the return value and memory management of @data.
*
* Returns: the handler ID, of type #gulong (always greater than 0 for successful connections)
* This function cannot fail. If the given signal doesn’t exist, a critical
* warning is emitted.
*
* Returns: the handler ID, of type `gulong` (always greater than 0)
*/
/* Intentionally not using G_CONNECT_DEFAULT here to avoid deprecation
* warnings with older GLIB_VERSION_MAX_ALLOWED */
@ -525,7 +528,10 @@ void g_signal_chain_from_overridden_handler (gpointer instance,
*
* The handler will be called synchronously, after the default handler of the signal.
*
* Returns: the handler ID, of type #gulong (always greater than 0 for successful connections)
* This function cannot fail. If the given signal doesn’t exist, a critical
* warning is emitted.
*
* Returns: the handler ID, of type `gulong` (always greater than 0)
*/
#define g_signal_connect_after(instance, detailed_signal, c_handler, data) \
g_signal_connect_data ((instance), (detailed_signal), (c_handler), (data), NULL, G_CONNECT_AFTER)
@ -563,7 +569,10 @@ void g_signal_chain_from_overridden_handler (gpointer instance,
* (GCallback) button_clicked_cb, other_widget);
* ]|
*
* Returns: the handler ID, of type #gulong (always greater than 0 for successful connections)
* This function cannot fail. If the given signal doesn’t exist, a critical
* warning is emitted.
*
* Returns: the handler ID, of type `gulong` (always greater than 0)
*/
#define g_signal_connect_swapped(instance, detailed_signal, c_handler, data) \
g_signal_connect_data ((instance), (detailed_signal), (c_handler), (data), NULL, G_CONNECT_SWAPPED)