logging_sample.cc

#include <string>
#include <iostream>
#include <gflags/gflags.h>
#include <glog/logging.h>

#define LINE std::cout << "------------------------------------------------------------" << std::endl;

// $ ./logging_sample -logtostderr=1
int main(int argc, char* argv[]) {
    // Initialize Google's logging library.
    google::InitGoogleLogging(argv[0]);
    google::ParseCommandLineFlags(&argc, &argv, true);

    std::cout << "START LOGGING" << std::endl;
    // logging of int
    int number = 10;
    LOG(INFO) << "number: " << number;

    // logging of int
    std::string spell = "Hello, world!";
    LOG(INFO) << "spell: " << spell;

    LINE;

    LOG(WARNING) << "log level: warning";
    LOG(ERROR) << "log leve: error";
    //LOG(FATAL) << "log level: fatal"; // displays backtrace and terminates the program

    LINE;

    LOG_IF(INFO, number > 0) << "number is greater than 0";

    LINE;

    VLOG(1) << "I'm printed when you run the program with --v=1 or higher";
    VLOG(2) << "I'm printed when you run the program with --v=2 or higher";
}