Implement a logging class to act as std::cout

I want to create a Logger class which will act as std::cout.

I want to use it this way:

#include "utils/logger.h"

int main(void)
{
    utils::logger << "Hello world";

    return 0;
}

Ideally this class will forward all logs to syslog. And syslog levels will be available through helpers like utils::error or utils::critical.

I have found some interesting resources:

• https://stackoverflow.com/a/4457138/2893600
• https://codereview.stackexchange.com/q/167321/158651

I know that this question seems to be already posted but I cannot make the links between all the responses.

1. I know the Logger class will have to inherit from std::ostream and / or std::streambuf.
2. How to use it directly (ie not instantiate any object in the main) ? I was thinking to do it globally in a utils/logger.cc file...
3. How to create the helpers ? I heard that macros are bad in C++

If someone have some useful links, hints and tips or awesome library to share it would be very nice.