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#ifndef _iv_iosfwd_
#define _iv_iosfwd_
#if __GNUC__>=3
#include_next <iosfwd>
using std::ios_base;
using std::filebuf;
using std::istream;
using std::ostream;
#define out_form(ostr,format,value) \
{ \
char buffer[1024]; \
snprintf(buffer, 1024, format, value); \
ostr << buffer; \
}	
#else
class istream;
class ostream;
#define out_form(ostr,format,value) \
ostr.form(format,value);
#endif
#endif