C++ logging using ostream

Question

I\'m making a logger. I want to create a function log() that takes a stream as input.

For instance:

log(\"hello\"<<\" \"<<\"         


        

Answer 1

You can't create a function like the one you want. You can, however, create a macro that handles that stuff for you:

// "log" may be defined in the  header file
// so undefine it if needed
#ifdef log
# undef log
#endif
#define log(stream)          \
    do {                     \
        acquire_lock();      \
        std::cout << stream; \
        release_lock();      \
    } while(0)

You have to change the acquire_lock and release_lock calls to the proper ones for you. And of course use a stream that is appropriate for you as well.