add formated printing of std::strings

git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@442 7ec92016-0320-0410-acc4-a06ded1c099a

CHANGES

@@ -22,6 +22,7 @@ SafeFormat:
     - speed comparison added (pk)
     - 64 bit problems fixed (Thanks to Zak Kipling)
     - ported to 64-bit Windows, not tested (pk)
+    - Printf/SPrintfing of std::strings added
 
 SmallObject:
     - added functions to check for memory corruption (rs)

include/loki/SafeFormat.h

@@ -166,6 +166,10 @@ namespace Loki
             return StoreCountHelper(pi);
         }
         
+        PrintfState& operator()(const std::string& stdstr) {
+            return operator()(stdstr.c_str());
+        }
+
         PrintfState& operator()(const char *const s) {
             if (result_ == -1) return *this;
             ReadLeaders();