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log ​

1. spdlog ​

1.1. Get Start ​

问题：按顺序包含 fmt/core.h spdlog/spdlog.h 会报错？？

sh
git submodule add https://github.com/gabime/spdlog third_party/spdlog
cmake
add_subdirectory(third_party/spdlog)
target_link_libraries(${PROJECT_NAME} PRIVATE spdlog::spdlog)
cpp
#include <spdlog/spdlog.h>
spdlog::info("message");

1.2. 打印 ​

  • spdlog::trace(...);
  • spdlog::debug(...);
  • spdlog::info(...);
  • spdlog::warn(...);
  • spdlog::error(...);
  • spdlog::critical(...);（不会退出程序）
  • 日志等级默认 info，spdlog::set_level(spdlog::level::debug);
  • 可以用 {}，spdlog::info("{}", 1);

2. GLog ​

2.1. 安装 ​

sh
vcpkg install glog
cmake
find_package(glog CONFIG REQUIRED)
target_link_libraries(${PROJECT_NAME} PRIVATE glog::glog)

2.2. 自定义 ​

cpp
#include <fmt/core.h>
#include <glog/logging.h>

#define log_info(...) (LOG(INFO) << fmt::format(__VA_ARGS__))
#define log_warn(...) (LOG(WARNING) << fmt::format(__VA_ARGS__))
#define log_error(...) (LOG(ERROR) << fmt::format(__VA_ARGS__))
#define log_panic(...) (LOG(FATAL) << fmt::format(__VA_ARGS__))

2.3. 使用 ​

cpp
int main(int argc, char **argv) {
    std::filesystem::create_directory("log");
    FLAGS_alsologtostderr = true;
    FLAGS_log_dir = "log";
    google::InitGoogleLogging(argv[0]);
}

只在终端打印

cpp
int main(int argc, char **argv) {
    FLAGS_minloglevel = 0;
    FLAGS_logtostderr = 1;
    google::InitGoogleLogging(argv[0]);
}