Added STR() utility function

src/accum.cc

@@ -35,6 +35,9 @@
 
 namespace ledger {
 
+straccstream       _accum;
+std::ostringstream _accum_buffer;
+
 std::streamsize straccbuf::xsputn(const char * s, std::streamsize num)
 {
   if (index == 0) {

src/accum.h

@@ -83,6 +83,14 @@ public:
 
 #define ACCUM(obj) (static_cast<const straccstream&>(obj).str())
 
+extern straccstream       _accum;
+extern std::ostringstream _accum_buffer;
+
+#define STR(msg)                                \
+  ((_accum_buffer << ACCUM(_accum << msg)),     \
+   _accum.clear(),                              \
+   _accum_buffer.str())
+
 } // namespace ledger
 
 #endif // _ACCUM_H

src/draft.cc

@@ -67,10 +67,8 @@ void draft_t::xact_template_t::dump(std::ostream& out) const
         << std::endl;
   } else {
     foreach (const post_template_t& post, posts) {
-      straccstream accum;
       out << std::endl
-          << ACCUM(accum << _("[Posting \"%1\"]")
-                   << (post.from ? _("from") : _("to")))
+          << STR(_("[Posting \"%1\"]") << (post.from ? _("from") : _("to")))
           << std::endl;
 
       if (post.account_mask)