建立Time 對象

建立2個Time對象，執行兩for迴圈，顯示時間延緩！

Time類：

//:C09:Cpptime.h//A simple time class#ifndef CPPTIME_H#define CPPTIME_H#include<ctime>#include<cstring>class Time{std::time_t t;std::tm local;char asciiRep[27];unsigned char lflag ,aflag;void updateLocal() {if(!lflag) {local =*std::localtime (&t);lflag++;}}void updateAscii() {if(!aflag) {updateLocal();std::strcpy (asciiRep,std::asctime(&local));}}public:Time() {mark();}void mark() {lflag=aflag=0;std::time(&t);}const char * ascii(){updateAscii();return asciiRep;}int delta(Time *dt) const {return int (std::difftime(t,dt->t));}int daylightSavings(){updateLocal();return local.tm_isdst;}int dayOfyear(){updateLocal();return local.tm_yday ;}int dayOfweek(){updateLocal();return local.tm_wday;}int since1900(){updateLocal();return local.tm_year;}int month(){updateLocal();return local.tm_mon;}int dayOfMonth(){updateLocal();return  local.tm_mday;}int hour(){updateLocal();return local.tm_hour;}int minute(){updateLocal();return local.tm_min ;}int second(){updateLocal();return local.tm_sec ;}};#endif 

測試：

#include "Cpptime.h"#include<iostream>using namespace std;int main(){ Time start; for(int i=1;i<900000;i++) { for(int j=1;j<999;j++){}/* cout<<i <<" ";*//* if(i%10==0) cout<<endl;*/ } Time end; cout<<endl; cout<<"start= " <<start.ascii()<<endl; cout<<"end= " <<end.ascii ()<<endl; cout<<"delta= "<<end.delta (&start);}