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* [PATCH 01/13] doc/coding-style: Update 'enum as switch variable' section
@ 2014-12-02 17:28 Szymon Janc
  2014-12-02 17:28 ` [PATCH 02/13] profiles: List all enum values in switch Szymon Janc
                   ` (12 more replies)
  0 siblings, 13 replies; 14+ messages in thread
From: Szymon Janc @ 2014-12-02 17:28 UTC (permalink / raw)
  To: linux-bluetooth; +Cc: Szymon Janc

Since GCC has option (-Wswitch-enum) that ensure all enum values are
handled inside switch it is no longer necessary to forbit default in
such case.
---
 doc/coding-style.txt | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/doc/coding-style.txt b/doc/coding-style.txt
index 59df64a..b3fbd2e 100644
--- a/doc/coding-style.txt
+++ b/doc/coding-style.txt
@@ -175,10 +175,11 @@ enum animal_type {
 M10: Enum as switch variable
 ============================
 
-If the variable of a switch is an enum, you must not include a default in
-switch body. The reason for this is: If later on you modify the enum by adding
-a new type, and forget to change the switch accordingly, the compiler will
-complain the new added type hasn't been handled.
+If the variable of a switch is an enum, you must include all values in
+switch body even if providing default. This is enforced by compiler option
+enabling extra warning in such case. The reason for this is to ensure that if
+later on enum is modified and one forget to change the switch accordingly, the
+compiler will complain the new added type hasn't been handled.
 
 Example:
 
@@ -190,7 +191,7 @@ enum animal_type {
 
 enum animal_type t;
 
-switch (t) {
+switch (t) { // OK
 case ANIMAL_TYPE_FOUR_LEGS:
 	...
 	break;
@@ -200,7 +201,18 @@ case ANIMAL_TYPE_EIGHT_LEGS:
 case ANIMAL_TYPE_TWO_LEGS:
 	...
 	break;
-default:  // wrong
+default:
+	break;
+}
+
+switch (t) { // Wrong
+case ANIMAL_TYPE_FOUR_LEGS:
+	...
+	break;
+case ANIMAL_TYPE_TWO_LEGS:
+	...
+	break;
+default:
 	break;
 }
 
-- 
1.9.1


^ permalink raw reply related	[flat|nested] 14+ messages in thread

end of thread, other threads:[~2014-12-08 13:25 UTC | newest]

Thread overview: 14+ messages (download: mbox.gz follow: Atom feed
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2014-12-02 17:28 [PATCH 01/13] doc/coding-style: Update 'enum as switch variable' section Szymon Janc
2014-12-02 17:28 ` [PATCH 02/13] profiles: List all enum values in switch Szymon Janc
2014-12-02 17:28 ` [PATCH 03/13] lib: " Szymon Janc
2014-12-02 17:28 ` [PATCH 04/13] btio: " Szymon Janc
2014-12-02 17:28 ` [PATCH 05/13] attrib: " Szymon Janc
2014-12-02 17:28 ` [PATCH 06/13] core: " Szymon Janc
2014-12-02 17:28 ` [PATCH 07/13] gobex: " Szymon Janc
2014-12-02 17:28 ` [PATCH 08/13] obexd: " Szymon Janc
2014-12-02 17:28 ` [PATCH 09/13] shared: " Szymon Janc
2014-12-02 17:28 ` [PATCH 10/13] android: " Szymon Janc
2014-12-02 17:28 ` [PATCH 11/13] unit: " Szymon Janc
2014-12-02 17:28 ` [PATCH 12/13] tools: " Szymon Janc
2014-12-02 17:28 ` [PATCH 13/13] build: Enable -Wswitch-enum in maintainer mode Szymon Janc
2014-12-08 13:25 ` [PATCH 01/13] doc/coding-style: Update 'enum as switch variable' section Szymon Janc

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