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Fixed 'std::bad_alloc' error when any observation period start date i…
…s before 1970. Fixes #59
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| /* | ||
| * @file DateFunctions.h | ||
| * | ||
| * This file is part of SelfControlledCaseSeries | ||
| * | ||
| * Copyright 2024 Observational Health Data Sciences and Informatics | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| #ifndef DATEFUNCTIONS_H_ | ||
| #define DATEFUNCTIONS_H_ | ||
|
|
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| #include <cmath> | ||
|
|
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| using namespace Rcpp; | ||
|
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| namespace ohdsi { | ||
| namespace sccs { | ||
|
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| // Note: In response to https://github.com/OHDSI/SelfControlledCaseSeries/issues/59 | ||
| // implementing our own date functions. Only alternatives appear to require | ||
| // C++ 20 or the Boost library. | ||
|
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| struct Date { | ||
| int year; | ||
| int month; // 1 - 12 | ||
| int day; // 1 - 31 | ||
| }; | ||
|
|
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| bool isLeapYear(int year) { | ||
| if (year % 4 != 0) return false; | ||
| if (year % 100 != 0) return true; | ||
| if (year % 400 != 0) return false; | ||
| return true; | ||
| } | ||
|
|
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| int daysInMonth(int year, int month) { | ||
| switch (month) { | ||
| case 1: return 31; | ||
| case 2: return isLeapYear(year) ? 29 : 28; | ||
| case 3: return 31; | ||
| case 4: return 30; | ||
| case 5: return 31; | ||
| case 6: return 30; | ||
| case 7: return 31; | ||
| case 8: return 31; | ||
| case 9: return 30; | ||
| case 10: return 31; | ||
| case 11: return 30; | ||
| case 12: return 31; | ||
| default: return 0; | ||
| } | ||
| } | ||
|
|
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| int daysFromStartOfYear(const Date& date) { | ||
| int days = 0; | ||
| for (int month = 1; month < date.month; ++month) { | ||
| days += daysInMonth(date.year, month); | ||
| } | ||
| days += date.day; | ||
| return days; | ||
| } | ||
|
|
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| int differenceInDays(const Date& date1, const Date& date2) { | ||
| if (date1.year < date2.year || | ||
| (date1.year == date2.year && date1.month < date2.month) || | ||
| (date1.year == date2.year && date1.month == date2.month && date1.day < date2.day)) { | ||
| throw std::invalid_argument("date1 cannot be earlier than date2"); | ||
| } | ||
| int daysDifference = 0; | ||
| for (int year = date2.year; year < date1.year; ++year) { | ||
| daysDifference += isLeapYear(year) ? 366 : 365; | ||
| } | ||
| daysDifference -= daysFromStartOfYear(date2); | ||
| daysDifference += daysFromStartOfYear(date1); | ||
| return std::abs(daysDifference); | ||
| } | ||
|
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| Date addMonth(const Date& date1) { | ||
| Date date2 = date1; | ||
| date2.month++; | ||
| if (date2.month == 13) { | ||
| date2.month = 1; | ||
| date2.year++; | ||
| } | ||
| return date2; | ||
| } | ||
|
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| Date addDays(const Date& startDate, int daysToAdd) { | ||
| if (daysToAdd < 0) | ||
| throw std::invalid_argument("daysToAdd cannot be negative"); | ||
| Date newDate = startDate; | ||
|
|
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| while (daysToAdd > 0) { | ||
| int daysThisMonth = daysInMonth(newDate.year, newDate.month); | ||
|
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| if (newDate.day + daysToAdd <= daysThisMonth) { | ||
| newDate.day += daysToAdd; | ||
| daysToAdd = 0; | ||
| } else { | ||
| daysToAdd -= (daysThisMonth - newDate.day + 1); | ||
| newDate.day = 1; | ||
| if (newDate.month == 12) { | ||
| newDate.month = 1; | ||
| newDate.year++; | ||
| } else { | ||
| newDate.month++; | ||
| } | ||
| } | ||
| } | ||
| return newDate; | ||
| } | ||
|
|
||
| } | ||
| } | ||
|
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| #endif /* DATEFUNCTIONS_H_ */ |
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