c11时间库一个小例子

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#pragma once #include <chrono> #include <string> #include <iostream> #include <ctime> #include <iomanip>   #define NAMESPACE(x) namespace x{ #define NAMESPACEEND(x) }     NAMESPACE(DEF)   const int kMicroSecondsPerSecond = 1000 * 1000;   class Timestamp { public:     Timestamp() {};     void TimestampSet(const Timestamp& t) {         time_ = t.time_;     };       bool valid() const { return time_.time_since_epoch().count() > 0; }     int64_t MicroSecondsSinceEpoch() const { return time_.time_since_epoch().count(); }     void Now() { time_  = std::chrono::system_clock::now();};     std::string Timestamp::ToFormattedString() const;     std::string ToString() const {         char buf[32] = { 0 };         auto s1 = std::chrono::duration_cast<std::chrono::microseconds>                  (time_.time_since_epoch()).count();            snprintf(buf, sizeof(buf) - 1, "%lld.%06lld", s1 / kMicroSecondsPerSecond, s1 % kMicroSecondsPerSecond);         //printf("buf %s\n", buf);         return buf;     };     const std::chrono::time_point<std::chrono::system_clock>&         Time() { return time_; }; private:     std::chrono::time_point<std::chrono::system_clock>  time_; };   inline bool operator<(Timestamp lhs, Timestamp rhs) {     return lhs.Time() < rhs.Time(); }   inline bool operator==(Timestamp lhs, Timestamp rhs) {     return lhs.Time() == rhs.Time(); }   inline bool operator>(Timestamp lhs, Timestamp rhs) {     return lhs.Time() > rhs.Time(); }   inline bool operator>=(Timestamp lhs, Timestamp rhs) {     return lhs.Time() >= rhs.Time(); }   inline int64_t timeDifference(Timestamp high, Timestamp low) {     return  (high.Time() - low.Time()).count(); }       std::string Timestamp::ToFormattedString() const {     auto t = std::chrono::system_clock::to_time_t(time_);       char mbstr[100] = {0};     if (std::strftime(mbstr, sizeof(mbstr), "%Y_%m_%d_%H_%M_%S", std::localtime(&t)))     {         return mbstr;     }       return mbstr; }   NAMESPACEEND(DEF)

 

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