implement non-member operator+ for iterators

all of these iterator classes already have a member operator+, which allows iter+int.
This commits addes non-member operator+, which allows int+iter, and forwards to the member
QList and QArrayData iterators now satisfy RandomAccessIterator concept

Change-Id: I25c1dd8cea299e735d5a5e288dbe23dc1d7a1933
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/corelib/tools/qset.h b/src/corelib/tools/qset.h
index 7ded120ab7..6640c8486d 100644
--- a/src/corelib/tools/qset.h
+++ b/src/corelib/tools/qset.h
@@ -131,6 +131,7 @@ public:
         inline iterator operator--(int) { iterator r = *this; --i; return r; }
         inline iterator operator+(int j) const { return i + j; }
         inline iterator operator-(int j) const { return i - j; }
+        friend inline iterator operator+(int j, iterator k) { return k + j; }
         inline iterator &operator+=(int j) { i += j; return *this; }
         inline iterator &operator-=(int j) { i -= j; return *this; }
     };
@@ -165,6 +166,7 @@ public:
         inline const_iterator operator--(int) { const_iterator r = *this; --i; return r; }
         inline const_iterator operator+(int j) const { return i + j; }
         inline const_iterator operator-(int j) const { return i - j; }
+        friend inline const_iterator operator+(int j, const_iterator k) { return k + j; }
         inline const_iterator &operator+=(int j) { i += j; return *this; }
         inline const_iterator &operator-=(int j) { i -= j; return *this; }
     };