C++ BOOST:: posix_time::time_iterator














































C++ BOOST:: posix_time::time_iterator



C++  Boost::posix_time::time_iterator 

INTRODUCTION

Time iterators provide a mechanism for iteration through times. Time iterators are similar to Bidirectional Iterators. However, time_iterators are different than standard iterators in that there is no underlying sequence, just a calculation function. In addition, time_iterators are directly comparable against instances of class ptime. Thus a second iterator for the end point of the iteration is not required, but rather a point in time can be used directly. For example, the following code iterates using a 15 minute iteration interval. The print hours example also illustrates the use of the time_iterator.

HEADER

#include "boost/date_time/posix_time/posix_time.hpp" //include all types plus i/o
or
#include "boost/date_time/posix_time/posix_time_types.hpp" //no i/o just types

OVERVIEW



Class

                  Description

           Construction Parameters

 



time_iterator

 

Iterate incrementing by the specified duration.

ptime start_time, time_duration increment

 


EXAMPLE

      #include "boost/date_time/posix_time/posix_time.hpp"
#include <iostream>
int main()
{
using namespace boost::gregorian;
using namespace boost::posix_time;
date d(2000,Jan,20);
ptime start(d);
ptime end = start + hours(1);
time_iterator titr(start,minutes(15)); //increment by 15 minutes
//produces 00:00:00, 00:15:00, 00:30:00, 00:45:00
while (titr < end) {
std::cout << to_simple_string(*titr) << std::endl;
++titr;
}
std::cout << "Now backward" << std::endl;
//produces 01:00:00, 00:45:00, 00:30:00, 00:15:00
while (titr > start) {
std::cout << to_simple_string(*titr) << std::endl;
--titr;
}
}


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