id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
339	Tribool: strange results on I/O	ethouris327	Douglas Gregor	"{{{
Please look at the code below:

#include <iostream>
#include <boost/logic/tribool.hpp>
using namespace std;
using namespace boost::logic;

#define PRINTEXP( exp ) print_exp( #exp, exp )

inline void print_exp( const char* name, tribool expr )
{
cout << name << "": "" << boolalpha << expr << endl;
}

int main( int argc, char** argv )
{
	cout << true << endl;
	cout << false << endl;
	cout << indeterminate << endl;

	const tribool yes = true;
	const tribool no = false;
	const tribool maybe = indeterminate;

	PRINTEXP( yes );
	PRINTEXP( no );
	PRINTEXP( maybe );

	return 0;
}


According to the documentation, the result should be:

1
0
2
yes: true
no: false
maybe: indeterminate

However the result is:
1
0
1
yes: true
no: false
maybe: false


Of course, there is a warning when compiling:

lite-3bool.cc:20: warning: the address of `bool 
   boost::logic::indeterminate(boost::logic::tribool, 
   boost::logic::detail::indeterminate_t)', will always be 
`true'

which excuses the ""1"" for indeterminate, however also 
proves that no `ostream& << tribool' is defined (or it's 
somehow not seen).


> uname -a
CYGWIN_NT-5.1 hostname 1.5.12(0.116/4/2) 2004-11-
10 08:34 i686 unknown unknown Cygwin

> g++ -v
...
Thread model: posix
gcc version 3.3.3 (cygwin special)


}}}"	Bugs	closed		None	None		Fixed