ACE_Date_Time、ACE_Time_Value、ACE_OS::gettimeofday() 5.0

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这两个类的设计意图（重要）

ACE_Time_Value的设计理念是：他是个整数，这个整数可以进行加减运算，比较运算
(1)这个整数表示时间轴上的一个点,时间轴的原点为1970年1月1日8点整
(2)这个整数的值表示离开原点的秒数
(3)两个整数相加会得到另一个整数，这个整数代表离开1970年更远的一个时间
(4)在这个理念的基础上下列操作符变的有意义：a<b a>b a<=b a>=b a==b a!=b a+b a-b a+=b a-=b
(5)其中进行a==b等操作符运算时，只比较到前面的秒，不比较后面的微秒部分(主要是方便开发人员使用)
ACE_Date_Time的设计理念：只是借助ACE_Time_Value来获取时间的年月日时分秒，别无它用

类型转换和初始化

ACE_Time_Value ------> ACE_Date_Time explicit ACE_Date_Time (const ACE_Time_Value& timevalue);

ACE_Time_Value ------> long ACE_OS::gettimeofday().get_msec()

long ------> ACE_Time_Value void ACE_Time_Value ::set_msec (const ACE_UINT64 &ms);

测试用例

#include "ace/Log_Msg.h"#include "ace/OS.h"#include "ace/Date_Time.h"#include "ace/Time_Value.h"#include <iostream>#include <string>using namespace std;//print ace_date_timevoid print_ace_date(const ACE_Date_Time& date){ACE_DEBUG((LM_DEBUG,"%d-%d-%d %d:%d:%d:%d\n",date.year(),date.month(),date.day(),date.hour(),date.minute(),date.second(),date.microsec()));}void print_ace_time(const string& name,const ACE_Time_Value& t){cout<<name<<"="<<t<<"秒"<<endl;}intACE_TMAIN (int, ACE_TCHAR *[]){cout<<"ACE_Time_Value从秒的角度看就是时间轴上的两个整数点，距离就是时间间隔："<<endl;ACE_Time_Value one_second(1),half_second(0,1000 * 500+1),zero_time;//initprint_ace_time("one_second",one_second);print_ace_time("half_second",half_second);print_ace_time("zero_time",zero_time);print_ace_time("one_second-zero_time",one_second-zero_time);print_ace_time("zero_time-one_second",zero_time-one_second);ACE_Time_Value seven_days_time(3600*24*7);cout<<"跨度七天的时间段：ACE_Time_Value seven_days_time(3600*24*7)"<<endl;print_ace_time("seven_days_time",seven_days_time);cout<<"当前时间： ACE_OS::gettimeofday()"<<endl;ACE_Time_Value now = ACE_OS::gettimeofday();print_ace_time("now",now);cout<<"时间比较："<<endl;if (one_second > half_second){cout<<"one_second > half_second"<<endl;}if (half_second > zero_time){cout<<"half_second > zero_time"<<endl;}ACE_Time_Value t1(0,1000*500+1),t2(0,1000*500+2);if (half_second == ACE_Time_Value(0,1000*500+2)){cout<<t1<<" == "<<t2<<endl;}else if (t1 < t2){cout<<t1<<" < "<<t2<<endl;}else if (t1 > t2){cout<<t1<<" > "<<t2<<endl;} else{cout<<t1<<" $$$ "<<t2<<endl;}cout<<"时间的原点：";print_ace_date(ACE_Date_Time(zero_time));cout<<"从原点开始七天后的时间：";print_ace_date(ACE_Date_Time(seven_days_time));return 0;}

官网介绍：http://www.dre.vanderbilt.edu/Doxygen/6.0.1/html/libace-doc/a00559.html

ACE_Time_Value使用注意事项 http://blog.csdn.net/stephenxu111/article/details/6457659

ACE_Time_Value使用注意事项（续） http://blog.csdn.net/stephenxu111/article/details/9053945

ACE官方测试用例

很好的说明了具体用法

//=============================================================================/** *  @file    Time_Value_Test.cpp * *  $Id: Time_Value_Test.cpp 95763 2012-05-16 06:43:51Z johnnyw $ * *    This is a simple test of ACE_Time_Value.  No command line arguments *    are needed to run the test. * *  @author Prashant Jain <pjain@cs.wustl.edu> and David Levine <levine@cs.wustl.edu> *///=============================================================================// Note, for this test the config.h file *must* come first!#include "ace/config-all.h"#include "test_config.h"#include "ace/ACE.h"#include "ace/Time_Value.h"#include "ace/Numeric_Limits.h"#ifdef ACE_HAS_CPP98_IOSTREAMS#include <sstream>#endifintrun_main (int, ACE_TCHAR *[]){  int ret = 0;  ACE_START_TEST (ACE_TEXT ("Time_Value_Test"));  ACE_Time_Value tv1;//0秒  ACE_Time_Value tv2 (2);//2秒  ACE_Time_Value tv3 (100U);//100秒  ACE_Time_Value tv4 (1, 1000000);//2秒  ACE_Time_Value tv5 (2UL);//2秒  ACE_Time_Value tv6 (1, -1000000);//0秒  ACE_Time_Value tv7 (static_cast<long> (2.0));//2秒  // Beware!  2.5 gets truncated to 2!  // NOTE:  this is intended to show what happens with  // ACE_Time_Value (2.5).  Some compilers, such as g++ 2.7.2.3,  // actually warn about it without the case.  ACE_Time_Value tv8 (static_cast <long> (2.5));//2秒  ACE_Time_Value first;  ACE_Time_Value last(ACE_Time_Value::max_time);  first = last;  ACE_TEST_ASSERT (first == last);  // Test assignment operator, tv9 and tv6 must be the same after this  ACE_Time_Value tv9;  tv9 = tv6;  ACE_TEST_ASSERT (tv1 == ACE_Time_Value (0));  ACE_TEST_ASSERT (tv2 < tv3);  ACE_TEST_ASSERT (tv2 <= tv2);  ACE_TEST_ASSERT (tv2 >= tv4);  ACE_TEST_ASSERT (tv5 >= tv6);  ACE_TEST_ASSERT (tv2 == ACE_Time_Value (1, 1000000));//tv2 (2);//2秒  == ACE_Time_Value (1, 1000000))  ACE_TEST_ASSERT (tv5 == tv4);  ACE_TEST_ASSERT (tv2 == tv4);  ACE_TEST_ASSERT (tv1 != tv2);  ACE_TEST_ASSERT (tv6 == tv1);  ACE_TEST_ASSERT (tv5 == tv7);  ACE_TEST_ASSERT (tv7 == tv8); // That's right!  See above . . .  ACE_TEST_ASSERT (tv9 == tv6);  ACE_Time_Value tv10 (1);  ACE_TEST_ASSERT (tv10.sec() == 1);  // test multiplication by double  // test simple multiplication  tv1.set (1, 1);  tv2.set (2, 2);  tv1 *= 2.0;  ACE_TEST_ASSERT (tv1 == tv2);  tv1.set (1, 1);  tv2.set (static_cast<time_t> (-2), static_cast<suseconds_t> (-2));  tv1 *= -2.0;  ACE_TEST_ASSERT (tv1 == tv2);  // test usec shift  tv1.set (1, 999999);  tv2.set (19, 999990);  tv1 *= 10.0;  ACE_TEST_ASSERT ( tv1 == tv2);  tv1.set (1, 999999);  tv2.set (static_cast<time_t> (-19), -999990);  tv1 *= -10.0;  ACE_TEST_ASSERT (tv1 == tv2);  // Test correct msec() convert; also checks for compile error reported in  // Bugzilla 3336.  ACE_Time_Value msec_test (42, 555000);  ACE_UINT64 ms = 0;  msec_test.msec (ms);  if (ms != 42555)    ACE_ERROR ((LM_ERROR,                ACE_TEXT ("msec test failed: %Q should be 42555\n"),                ms));  ms = 0;  ms = msec_test.get_msec ();  if (ms != 42555)    ACE_ERROR ((LM_ERROR,                ACE_TEXT ("get_msec test failed: %Q should be 42555\n"),                ms));  ACE_Time_Value const msec_test2 (42, 555000);  ms = 0;  msec_test2.msec (ms);  if (ms != 42555)    ACE_ERROR ((LM_ERROR,                ACE_TEXT ("msec const test failed: %Q should be 42555\n"),                ms));  // Test setting from ACE_UINT64  ms = 42555;  ACE_Time_Value msec_test3;  msec_test3.set_msec (ms);  if (msec_test3.sec () != 42)    ACE_ERROR ((LM_ERROR,                ACE_TEXT ("set_msec test failed: %d secs should be 42\n"),                msec_test3.sec ()));  if (msec_test3.usec () != 555000)    ACE_ERROR ((LM_ERROR,                ACE_TEXT ("set_msec test failed: %d usecs should be 555000\n"),                msec_test3.usec ()));#ifdef ACE_HAS_CPP98_IOSTREAMS  std::ostringstream ost;  ost << ACE_Time_Value(1);  ACE_TEST_ASSERT( ost.str() == "1" );  ost.str("");  ost << ACE_Time_Value(1,1);  ACE_TEST_ASSERT( ost.str() == "1.000001" );  ost.str("");  ost << ACE_Time_Value(static_cast<time_t>(-1),-1);  ACE_TEST_ASSERT( ost.str() == "-1.000001" );  ost.str("");  ost << ACE_Time_Value(0,1);  ACE_TEST_ASSERT( ost.str() == "0.000001" );  ost.str("");  ost << ACE_Time_Value(0,-1);  ACE_TEST_ASSERT( ost.str() == "-0.000001" );  ost.str("");  ost << ACE_Time_Value();  ACE_TEST_ASSERT( ost.str() == "0" );#endif  ACE_END_TEST;  return ret;}

类型转换和初始化

ACE_Time_Value ------> ACE_Date_Time explicit ACE_Date_Time (const ACE_Time_Value& timevalue);

ACE_Time_Value ------> long ACE_OS::gettimeofday().get_msec()

long ------> ACE_Time_Value void ACE_Time_Value ::set_msec (const ACE_UINT64 &ms);

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