How to create a std::ofstream to a temp file?

Question

Okay, mkstemp is the preferred way to create a temp file in POSIX.

But it opens the file and returns an int, which is a file descriptor. F

Answer 1

I think this should work:

    char *tmpname = strdup("/tmp/tmpfileXXXXXX");
    ofstream f;
    int fd = mkstemp(tmpname);
    f.attach(fd);

EDIT: Well, this might not be portable. If you can't use attach and can't create a ofstream directly from a file descriptor, then you have to do this:

char *tmpname = strdup("/tmp/tmpfileXXXXXX");
mkstemp(tmpname);
ofstream f(tmpname);

As mkstemp already creates the file for you, race condition should not be a problem here.