Ticket #12178: reset_stream_state.patch

boost/log/sources/record_ostream.hpp

@@ -252 +252 @@
         //! Log record stream adapter
         basic_record_ostream< char_type > stream;
 
+        //! Stream format flags
+        std::ios_base::fmtflags fmtflags;
+
+        //! Stream precision
+        std::streamsize precision;
+
+        //! Stream field width
+        std::streamsize width;
+
+        //! Stream fill character
+        char_type fill;
+
         //! Initializing constructor
-        explicit stream_compound(record& rec) : next(NULL), stream(rec) {}
+        explicit stream_compound(record& rec) :
+            next(NULL),
+            stream(rec),
+            fmtflags(stream.flags()),
+            precision(stream.precision()),
+            width(stream.width()),
+            fill(stream.fill())
+        {
+        }
     };
 
     //! The method returns an allocated stream compound

libs/log/src/record_ostream.cpp

@@ -139 +139 @@
         stream_compound* p = pool.m_Top;
         pool.m_Top = p->next;
         p->next = NULL;
+
+        // restore the original stream state saved at construction
+        p->stream.flags(p->fmtflags);
+        p->stream.precision(p->precision);
+        p->stream.width(p->width);
+        p->stream.fill(p->fill);
+
         p->stream.attach_record(rec);
         return p;
     }