封装简易cpp日志模块
封装 cpp 简易的日志，可以在开发一个新项目马上引用进来。如下是一个简单的思路
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| #pragma once
#include <iostream>
#include <iomanip>
#include <string>
#include <fstream>
#include <utility>
enum LogLevel {
INFO = 0,
WARNING,
ERROR,
};
class Logger {
public:
Logger() = default;
~Logger() {
get_stream() << std::endl << std::flush;
}
Logger(const Logger&) = delete;
Logger& operator=(const Logger&) = delete;
Logger(Logger&&) = delete;
Logger& operator=(Logger&&) = delete;
public:
static std::ostream& start(LogLevel log_level, const int line, const std::string& func) {
time_t tm;
time(&tm);
char time_str[128];
strftime(time_str, sizeof(time_str), "[%Y-%m-%d %X] ", localtime(&tm));
return get_stream() << time_str << "func[" << func << "] " << "line[" << line << "] ";
}
static std::ostream& get_stream() {
return file_.is_open() ? file_ : std::cout;
}
private:
friend void init_logger(const std::string& filename);
private:
LogLevel log_level_;
static std::ofstream file_;
};
std::ofstream Logger::file_;
void init_logger(const std::string& filename) {
Logger::file_.open(filename.c_str(), std::ofstream::app);
}
#define LOG(log_level) \
Logger().start(log_level, __LINE__, __FUNCTION__)
|
缺点是每次使用日志，都将创建一个 Logger 的对象，以及释放这个对象。