-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Sunday 12 July 2009, Frédéric Bron wrote:
boost::thread_specific_ptrstd::ofstream flogs ;
// first solution using a function std::ostream &flog() { return *flogs.get() ; } // but I then have to add () after flog: flog() << "hello world!" ;
// second solution using a macro #define flog flog() // but macros are not very recommended in C++.
Any other idea that would allow me to write flog << "hello world!" like with std::cout?
Note that I also tried to write a class derived from ostream with only one instance flog. This class had a special stream buffer using a thread specific pointer. However, the flog instance stores some informations like the precision of real numbers (flog << setprecision(10) for example) and the output of one thread can then interfere with the output of other threads...
So put them all in the thread specific pointer. I don't see what's so
objectionable about flog() << "hello world!" though.
struct flogs_impl
{
std::ofstream;
unsigned precision;
//...
};
class flogs
{
//...
boost::thread_specific_ptr