date_8h-source.html
来自「一个功能强大的内存数据库源代码,c++编写,有详细的注释」· HTML 代码 · 共 240 行 · 第 1/2 页
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>date.h Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.2.15 --><center><a class="qindex" href="index.html">Main Page</a> <a class="qindex" href="hierarchy.html">Class Hierarchy</a> <a class="qindex" href="annotated.html">Compound List</a> <a class="qindex" href="files.html">File List</a> <a class="qindex" href="functions.html">Compound Members</a> </center><hr><h1>date.h</h1><div class="fragment"><pre>00001 <font class="comment">//-< DATE.H >--------------------------------------------------------*--------*</font>00002 <font class="comment">// FastDB Version 1.0 (c) 1999 GARRET * ? *</font>00003 <font class="comment">// (Main Memory Database Management System) * /\| *</font>00004 <font class="comment">// * / \ *</font>00005 <font class="comment">// Created: 30-Apr-2000 K.A. Knizhnik * / [] \ *</font>00006 <font class="comment">// Last update: 30-Apr-2000 K.A. Knizhnik * GARRET *</font>00007 <font class="comment">//-------------------------------------------------------------------*--------*</font>00008 <font class="comment">// Date field type</font>00009 <font class="comment">//-------------------------------------------------------------------*--------*</font>00010 00011 <font class="preprocessor">#ifndef __DATE_H__</font>00012 <font class="preprocessor"></font><font class="preprocessor">#define __DATE_H__</font>00013 <font class="preprocessor"></font>00014 <font class="preprocessor">#include <time.h></font>00015 <font class="preprocessor">#include "stdtp.h"</font>00016 <font class="preprocessor">#include "class.h"</font>00017 00018 <font class="preprocessor">#if !defined(NO_PTHREADS) && !defined(_WIN32)</font>00019 <font class="preprocessor"></font><font class="preprocessor">#define USE_REENTRANT_LIBRARY</font>00020 <font class="preprocessor"></font><font class="preprocessor">#endif</font>00021 <font class="preprocessor"></font>00022 <font class="keyword">class </font>FASTDB_DLL_ENTRY dbDate { 00023 int4 jday;00024 <font class="keyword">public</font>:00025 <font class="keywordtype">bool</font> operator == (dbDate <font class="keyword">const</font>& dt) { 00026 <font class="keywordflow">return</font> jday == dt.jday;00027 }00028 <font class="keywordtype">bool</font> operator != (dbDate <font class="keyword">const</font>& dt) { 00029 <font class="keywordflow">return</font> jday != dt.jday;00030 }00031 <font class="keywordtype">bool</font> operator > (dbDate <font class="keyword">const</font>& dt) { 00032 <font class="keywordflow">return</font> jday > dt.jday;00033 }00034 <font class="keywordtype">bool</font> operator >= (dbDate <font class="keyword">const</font>& dt) { 00035 <font class="keywordflow">return</font> jday >= dt.jday;00036 }00037 <font class="keywordtype">bool</font> operator < (dbDate <font class="keyword">const</font>& dt) { 00038 <font class="keywordflow">return</font> jday < dt.jday;00039 }00040 <font class="keywordtype">bool</font> operator <= (dbDate <font class="keyword">const</font>& dt) { 00041 <font class="keywordflow">return</font> jday <= dt.jday;00042 }00043 <font class="keywordtype">int</font> operator - (dbDate <font class="keyword">const</font>& dt) { 00044 <font class="keywordflow">return</font> jday - dt.jday;00045 }00046 <font class="keywordtype">int</font> operator + (<font class="keywordtype">int</font> days) { 00047 <font class="keywordflow">return</font> jday + days;00048 }00049 <font class="keyword">static</font> dbDate current() { 00050 time_t now = time(NULL);00051 <font class="keyword">struct </font>tm* tp;00052 <font class="preprocessor">#ifdef USE_REENTRANT_LIBRARY</font>00053 <font class="preprocessor"></font> <font class="keyword">struct </font>tm t;00054 tp = localtime_r(&now, &t);00055 <font class="preprocessor">#else </font>00056 <font class="preprocessor"></font> tp = localtime(&now);00057 <font class="preprocessor">#endif</font>00058 <font class="preprocessor"></font> <font class="keywordflow">return</font> dbDate(tp->tm_year + 1900, tp->tm_mon + 1, tp->tm_mday);00059 }00060 00061 dbDate() { 00062 jday = -1;00063 } 00064 <font class="keywordtype">bool</font> isValid() { 00065 <font class="keywordflow">return</font> jday != -1;00066 }00067 00068 <font class="keywordtype">unsigned</font> JulianDay() { <font class="keywordflow">return</font> jday; }00069 00070 <font class="keywordtype">void</font> clear() { jday = -1; }00071 00072 dbDate(<font class="keywordtype">int</font> year, <font class="keywordtype">int</font> month, <font class="keywordtype">int</font> day) {00073 <font class="comment">/*</font>00074 <font class="comment"> Convert Gregorian calendar date to the corresponding Julian day number</font>00075 <font class="comment"> j. Algorithm 199 from Communications of the ACM, Volume 6, No. 8,</font>00076 <font class="comment"> (Aug. 1963), p. 444. Gregorian calendar started on Sep. 14, 1752.</font>00077 <font class="comment"> This function not valid before that.</font>00078 <font class="comment"> */</font>00079 nat4 c, ya;00080 <font class="keywordflow">if</font> (month > 2)00081 month -= 3;00082 <font class="keywordflow">else</font> {00083 month += 9;00084 year--;00085 } <font class="comment">/* else */</font>00086 c = year / 100;00087 ya = year - 100*c;00088 jday = ((146097*c)>>2) + ((1461*ya)>>2) + (153*month + 2)/5 + day + 1721119;00089 } <font class="comment">/* jday */</font>00090 00091 <font class="keywordtype">void</font> MDY(<font class="keywordtype">int</font>& year, <font class="keywordtype">int</font>& month, <font class="keywordtype">int</font>& day)<font class="keyword"> const </font>{ 00092 <font class="comment">/*</font>00093 <font class="comment"> Convert a Julian day number to its corresponding Gregorian calendar</font>00094 <font class="comment"> date. Algorithm 199 from Communications of the ACM, Volume 6, No. 8,</font>00095 <font class="comment"> (Aug. 1963), p. 444. Gregorian calendar started on Sep. 14, 1752.</font>00096 <font class="comment"> This function not valid before that.</font>00097 <font class="comment"> */</font>00098 nat4 j = jday - 1721119;00099 <font class="keywordtype">int</font> m, d, y;00100 y = (((j<<2) - 1) / 146097);00101 j = (j<<2) - 1 - 146097*y;00102 d = (j>>2);00103 j = ((d<<2) + 3) / 1461;00104 d = ((d<<2) + 3 - 1461*j);00105 d = (d + 4)>>2;00106 m = (5*d - 3)/153;00107 d = 5*d - 3 - 153*m;00108 d = (d + 5)/5;00109 y = (100*y + j);00110 <font class="keywordflow">if</font> (m < 10) { 00111 m += 3;00112 } <font class="keywordflow">else</font> {⌨️ 快捷键说明
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