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114 lines
3.4 KiB
HTML
114 lines
3.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
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<title>GDTL Design Goals</title>
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<link href="doxygen.css" rel="stylesheet" type="text/css">
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</head><body bgcolor="#ffffff">
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<body>
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<a href="http://www.boost.org">
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<img align="left" src="c++boost.gif" alt="C++ Boost">
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</a>
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<h1>GDTL Design Goals</h1>
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<p>
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<p>
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<p>
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<p>
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<a href="index.html">GDTL Index</a> --
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<a href="gregorian.html">Gregorian Index</a> --
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<a href="posix_time.html">Posix Time Index</a>
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<p>
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<p>
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<table border="1" width="95%" >
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<tr><td>Category</td><td>Description</td><td>Functions</td></tr>
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<tr><td>Interfaces</td>
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<td>Provide concrete classes for manipulation of dates and times</td>
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<td>
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<ul>
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<li>date, time, date_duration, time_duration, date_period, time_period, etc
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<li>support for infinity - positive infinity, negative infinity
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<li>iterators over time and date ranges
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<li>allow date and time implemenations to be separate as much as possible
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</ul>
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</td>
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</tr>
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<tr>
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<td>Calculation</td>
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<td>Provide a basis for performing efficient time calculations </td>
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<td>
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<ul>
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<li>days between dates
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<li>durations of times
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<li>durations of dates and times together
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</ul>
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</td></tr>
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<tr><td>Representation Flexibility</td>
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<td>Provide the maximum possible reusability and flexibility</td>
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<td>
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<ul>
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<li>traits based customization of internal
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representations for size versus resolution control
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<li>Allowing the use of different epochs and resolution
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(eg: seconds versus microseconds, dates starting at the
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year 2000 versus dates starting in 1700)
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<li>Options for configuring unique calendar
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representations (Gregorian + others)
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<li> the use of Julian Day number and the conversion between this and the Gregorian/Julian calendar date
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<li>Allow for flexible adjustments including
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leap seconds
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</ul>
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<tr><td>Date Calculations</td>
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<td>Provide tools for date calculations</td>
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<td>
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<ul>
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<li>provide basis for calculation of complex event specs like holidays
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<li>calendar to calendar conversions
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<li>provide for ability to extend to new calendar systems
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</ul>
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</td>
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</tr>
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<tr><td>Time Calculations</td>
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<td>Provide concrete classes for manipulation of time</td>
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<td>
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<ul>
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<li>provide the ability to handle cross time-zone issues
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<li>provide adjustments for daylight savings time (summer time)
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</ul>
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</td>
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</tr>
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<tr><td>Clock Interfaces</td>
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<td>Provide classes for retrieving time current time</td>
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<td>
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<ul>
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<li>access to a network / high resolution time sources
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<li>retrieving the current date time information to populate classes
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</ul>
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</td>
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</tr>
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<tr><td>I/O Interfaces</td>
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<td>Provide input and output for time including</td>
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<td>
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<ul>
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<li>multi-lingual support
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<li>provide ISO8601 compliant time facet
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<li>use I/O facets for different local behavior
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</ul>
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</td>
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</tr>
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</td></tr>
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</table>
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<hr>
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<address><small>
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<!-- hhmts start -->
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Last modified: Mon Jul 8 14:49:41 MST 2002
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<!-- hhmts end -->
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by Jeff Garland for <a href="http://www.crystalclearsoftware.com">CrystalClear Software</a> © 2000-2002
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</small></address>
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</body>
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</html>
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