glog和gflags的使用

glog：日志

gflags：命令行参数解析

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

DEFINE_string(input_dir, "", "Path to the input data directory."); //不一定放在main函数中
DEFINE_string(output_dir, "", "Path to the output result directory.");
DEFINE_bool(show_image, false, "Whether to show images"); // 调试开关
DEFINE_double(rate, 1.0,""); // 代替宏定义

int main(int argc, char *argv[]) 
{
    google::InitGoogleLogging(argv[0]);
    FLAGS_logtostderr = 1;
    FLAGS_colorlogtostderr = 1;
    gflags::ParseCommandLineFlags(&argc, &argv, true);

    string input_dir = FLAGS_input_dir;
    string input_dir = FLAGS_output_dir;

    LOG(INFO|WARNING|FATAL) << "xxx" << "xxx";
    LOG_IF(FATAL, 条件)
}

run:./main --input_dir="xxx" --output_dir="xxx"

CMakeList.txt:

find_package(gflags REQUIRED)
include_directories(${gflags_INCLUDE_DIR})
find_package(Glog REQUIRED)
include_directories(${GLOG_INCLUDE_DIRS})

add_executable(main main.cpp)
target_link_libraries(main glog::glog gflags)