Add debug output operator<< for ScRangeList

Change-Id: I55f16428bbadd45d302ac31df9c1a691730c4a49
Reviewed-on: https://gerrit.libreoffice.org/45158Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tor Lillqvist <tml@collabora.com>

sc/inc/rangelst.hxx

@@ -22,6 +22,7 @@
 
 #include "global.hxx"
 #include "address.hxx"
+#include <ostream>
 #include <vector>
 #include <sal/types.h>
 
@@ -100,6 +101,22 @@ private:
 };
 typedef tools::SvRef<ScRangeList> ScRangeListRef;
 
+// For use in SAL_DEBUG etc. Output format not guaranteed to be stable.
+template<typename charT, typename traits>
+inline std::basic_ostream<charT, traits> & operator <<(std::basic_ostream<charT, traits> & stream, const ScRangeList& rRangeList)
+{
+    stream << "(";
+    for (size_t i = 0; i < rRangeList.size(); ++i)
+    {
+        if (i > 0)
+            stream << ",";
+        stream << *(rRangeList[i]);
+    }
+    stream << ")";
+
+    return stream;
+}
+
 // RangePairList:
 //    aRange[0]: actual range,
 //    aRange[1]: data for that range, e.g. Rows belonging to a ColName