\u300aC++\u9ad8\u7ea7\u7f16\u7a0b\u300b\u7b2c\u4e8c\u5341\u516d\u7ae0\u7684\u4e00\u4e2a\u4f8b\u5b50\u3002
\n\/**
\n* Logger.h
\n*
\n* Definition of a singleton logger class, implemented with static methods
\n*\/
\n#include <iostream>
\n#include <fstream>
\n#include <vector>
\n#include <string>
\nclass Logger
\n{
\npublic:
\nstatic const std::string kLogLevelDebug;
\nstatic const std::string kLogLevelInfo;
\nstatic const std::string kLogLevelError;
\n\/\/ Return a reference to the singleton logger object
\nstatic Logger& instance();
\n\/\/ Log a single message at the given log level
\nvoid log(const std::string& inMessage, const std::string& inLogLevel);
\n\/\/ Log a vector of messages at the given log level
\nvoid log(const std::vector<std::string>& inMessage, const std::string& inLogLevel);
\nprotected:
\n\/\/ static variable for the one-and-only instance
\nstatic Logger sInstance;
\n\/\/ Constant for the filename
\nstatic const char* const kLogFileName;
\n\/\/ Data member for the output stream
\nstd::ofstream mOutputStream;
\nprivate:
\n\/\/ \u5173\u952e\uff1a\u79c1\u6709\u7684\u6784\u9020\u51fd\u6570\uff0c\u4e0d\u80fd\u5b9e\u4f8b\u5316\uff0c\u56e0\u4e3a\u5b9e\u4f8b\u5316\u65f6\u7c7b\u5916\u90e8\u65e0\u6cd5\u8bbf\u95ee\u5176\u5185\u90e8\u7684\u79c1\u6709\u7684\u6784\u9020\u51fd\u6570
\nLogger(void);
\n~Logger(void);
\n};<\/p>\n
\/**
\n* Logger.cpp
\n*
\n* Implementation of a singleton logger class
\n*\/
\n#include “Logger.h”
\n#include <string>
\nusing namespace std;
\nconst string Logger::kLogLevelDebug = “DEBUG”;
\nconst string Logger::kLogLevelInfo = “INFO”;
\nconst string Logger::kLogLevelError = “Error”;
\nconst char* const Logger::kLogFileName = “log.out”;
\n\/\/ The static instance will be construct when the program starts and destructed when it ends.
\nLogger Logger::sInstance;
\nLogger::Logger(void)
\n{
\nmOutputStream.open(kLogFileName, ios_base::app);
\nif (!(mOutputStream.good())) {
\ncerr << “Unable to initialize the Logger!” << endl;
\n}
\n}
\nLogger::~Logger(void)
\n{
\nmOutputStream.close();
\n}
\nLogger& Logger::instance()
\n{
\nreturn sInstance;
\n}
\nvoid Logger::log(const std::string& inMessage, const std::string& inLogLevel)
\n{
\nmOutputStream << inLogLevel << “:” << inMessage << endl;
\n}
\nvoid Logger::log(const std::vector<std::string>& inMessage, const std::string& inLogLevel)
\n{
\nfor (size_t i=0; i<inMessage.size(); i++) {
\nlog(inMessage[i], inLogLevel);
\n}
\n}<\/p>\n
\/\/ TestTrueSingletonLogger.cpp
\n#include “Logger.h”
\n#include <vector>
\n#include <string>
\nint main(int argc, char **argv)
\n{
\nLogger::instance().log(“test message”, Logger::kLogLevelDebug);
\nvector<string> items;
\nitems.push_back(“item1”);
\nitems.push_back(“item2”);
\nLogger::instance().log(items, Logger::kLogLevelError);
\nreturn 0;
\n}<\/p>\n","protected":false},"excerpt":{"rendered":"
\u300aC++\u9ad8\u7ea7\u7f16\u7a0b\u300b\u7b2c\u4e8c\u5341\u516d\u7ae0\u7684\u4e00\u4e2a\u4f8b\u5b50\u3002 \/** * Logger.h * * Definition of a singleton logger class, implemented with static methods *\/ #include <iostream> #include <fstream> #include <vector> #include <string> class Logger { public: static const std::string kLogLevelDebug; static const std::string kLogLevelInfo; static const std::string kLogLevelError; \/\/ Return a reference to the singleton logger object static Logger& instance(); \/\/ Log […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-54","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"https:\/\/bylang.cn\/index.php?rest_route=\/wp\/v2\/posts\/54","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bylang.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bylang.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bylang.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bylang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=54"}],"version-history":[{"count":3,"href":"https:\/\/bylang.cn\/index.php?rest_route=\/wp\/v2\/posts\/54\/revisions"}],"predecessor-version":[{"id":57,"href":"https:\/\/bylang.cn\/index.php?rest_route=\/wp\/v2\/posts\/54\/revisions\/57"}],"wp:attachment":[{"href":"https:\/\/bylang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=54"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bylang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=54"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bylang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=54"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}