containers: add C++11-style c{begin,end}() as alias for const{Begin,End}()

C++11 adds cbegin()/cend() functions for the same reason Qt has
constBegin()/constEnd(). This patch adds these functions to the
Qt containers with the same implementation as constBegin()/constEnd().

It also fixes the return types in the documentation of existing
constFind() functions (documentation only).

C++11 only adds cbegin()/cend() (and crbegin()/crend(), which Qt doesn't have).
In particular, it doesn't add cfind(), so I didn't supply these, even though
Qt comes with constFind().

This is a forward-port of https://qt.gitorious.org/qt/qt/merge_requests/1365.

Change-Id: Ida086b64246b24e25254eafbcb06c8e33388502b
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/corelib/tools/qset.h b/src/corelib/tools/qset.h
index 7750cd1147..e85c770d42 100644
--- a/src/corelib/tools/qset.h
+++ b/src/corelib/tools/qset.h
@@ -164,9 +164,11 @@ public:
     // STL style
     inline iterator begin() { return q_hash.begin(); }
     inline const_iterator begin() const { return q_hash.begin(); }
+    inline const_iterator cbegin() const { return q_hash.begin(); }
     inline const_iterator constBegin() const { return q_hash.constBegin(); }
     inline iterator end() { return q_hash.end(); }
     inline const_iterator end() const { return q_hash.end(); }
+    inline const_iterator cend() const { return q_hash.end(); }
     inline const_iterator constEnd() const { return q_hash.constEnd(); }
     iterator erase(iterator i)
         { return q_hash.erase(reinterpret_cast<typename Hash::iterator &>(i)); }