[LOGCXX-150] logstream's operator<< declared in the wrong namespace

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.10.0
• Fix Version/s: 0.10.0
• Environment: FC4 - g++ (GCC) 4.0.2 20051125
• Assignee: Curt Arnold
• Reporter: David M. Lee
• Created: 18/Jul/06 01:41
• Updated: 08/Nov/07 23:50
• Resolved: 08/Nov/07 23:50

Description

This is one of those strange nuances of C++ (or maybe just GCC). logstream's << operators don't work from within a namespace that has operator<< defined. For example:

#include <log4cxx/logger.h>
#include <log4cxx/stream.h>
#include <ostream>

namespace foo
{
class Bar

{ void fn(); }

;

std::ostream &operator<<(std::ostream &o, Bar const &b)

{ return o << "Bar"; }

}

using namespace foo;

namespace
{
log4cxx::LoggerPtr logger(log4cxx::Logger::getLogger("foo"));
log4cxx::logstream lout(logger, log4cxx::Level::DEBUG);
}

void Bar::fn()
{
lout << "hi" << LOG4CXX_ENDMSG;
}

Compiles with the following error:
g++ -c -o log4cxx-ns.o log4cxx-ns.cpp
log4cxx-ns.cpp: In member function 'void foo::Bar::fn()':
log4cxx-ns.cpp:29: error: no match for 'operator<<' in '<unnamed>::lout << "hi"'
log4cxx-ns.cpp:12: note: candidates are: std::ostream& foo::operator<<(std::ostream&, const foo::Bar&)

For the Koenig lookup to work properly, the operator<< functions need to be defined in the log4cxx namespace.