There's probably far more reasonable cases of temporaries being immediately destructed than you'd expect.

One that springs to mind is gtest. It defines a bunch of macros like ASSERT_TRUE that return a temporary object that has operator<< overloads to let you add additional information to the assertion failure. For example:

    ASSERT_NE(-1, open("/foo", O_RDONLY)) << "failed to open file: " << strerror(errno);

It's perfectly legitimate to just go ASSERT_TRUE(1 != 2), though.