libwreport  2.4
notes.h
00001 /*
00002  * wreport/notes - Collect notes about unusual processing
00003  *
00004  * Copyright (C) 2011  ARPA-SIM <urpsim@smr.arpa.emr.it>
00005  *
00006  * This program is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License.
00009  *
00010  * This program is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  * GNU General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU General Public License
00016  * along with this program; if not, write to the Free Software
00017  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
00018  *
00019  * Author: Enrico Zini <enrico@enricozini.com>
00020  */
00021 
00022 #ifndef WREPORT_NOTES_H
00023 #define WREPORT_NOTES_H
00024 
00025 #include <iosfwd>
00026 
00027 #ifndef WREPORT_PRINTF_ATTRS
00028 #define WREPORT_PRINTF_ATTRS(a, b) __attribute__ ((format(printf, a, b)))
00029 #endif
00030 
00031 namespace wreport {
00032 
00039 namespace notes {
00040 
00042 void set_target(std::ostream& out);
00043 
00045 std::ostream* get_target();
00046 
00048 bool logs() throw ();
00049 
00051 std::ostream& log() throw ();
00052 
00054 void logf(const char* fmt, ...) WREPORT_PRINTF_ATTRS(1, 2);
00055 
00062 struct Collect
00063 {
00067     std::ostream* old;
00068 
00070     Collect(std::ostream& out)
00071     {
00072         old = get_target();
00073         set_target(out);
00074     }
00075     ~Collect()
00076     {
00077         set_target(*old);
00078     }
00079 };
00080 
00081 }
00082 
00083 }
00084 
00085 /* vim:set ts=4 sw=4: */
00086 #endif