-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Sunday 12 July 2009, Frédéric Bron wrote:
boost::thread_specific_ptr<std::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<flogs_impl> _impl; }; -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAkpbLi4ACgkQ5vihyNWuA4W5LwCgwenyYt8MSADxvA4tVLNvsC4E zFcAn2bjM0PW5NnewclxB5NbAXjTiDJa =zGOO -----END PGP SIGNATURE-----