1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 10 11 // <chrono> 12 // class year_month_day_last; 13 14 // constexpr year_month_day_last 15 // operator-(const year_month_day_last& ymdl, const months& dm) noexcept; 16 // 17 // Returns: ymdl + (-dm). 18 // 19 // constexpr year_month_day_last 20 // operator-(const year_month_day_last& ymdl, const years& dy) noexcept; 21 // 22 // Returns: ymdl + (-dy). 23 24 25 #include <chrono> 26 #include <type_traits> 27 #include <cassert> 28 29 #include "test_macros.h" 30 31 #include <iostream> 32 33 constexpr bool testConstexprYears (std::chrono::year_month_day_last ymdl) 34 { 35 std::chrono::year_month_day_last ym1 = ymdl - std::chrono::years{10}; 36 return 37 ym1.year() == std::chrono::year{static_cast<int>(ymdl.year()) - 10} 38 && ym1.month() == ymdl.month() 39 ; 40 } 41 42 constexpr bool testConstexprMonths (std::chrono::year_month_day_last ymdl) 43 { 44 std::chrono::year_month_day_last ym1 = ymdl - std::chrono::months{6}; 45 return 46 ym1.year() == ymdl.year() 47 && ym1.month() == std::chrono::month{static_cast<unsigned>(ymdl.month()) - 6} 48 ; 49 } 50 51 int main() 52 { 53 using year = std::chrono::year; 54 using month = std::chrono::month; 55 using month_day_last = std::chrono::month_day_last; 56 using year_month_day_last = std::chrono::year_month_day_last; 57 using months = std::chrono::months; 58 using years = std::chrono::years; 59 60 constexpr month December = std::chrono::December; 61 62 { // year_month_day_last - years 63 ASSERT_NOEXCEPT( std::declval<year_month_day_last>() - std::declval<years>()); 64 ASSERT_SAME_TYPE(year_month_day_last, decltype(std::declval<year_month_day_last>() - std::declval<years>())); 65 66 static_assert(testConstexprYears(year_month_day_last{year{1234}, month_day_last{December}}), ""); 67 year_month_day_last ym{year{1234}, month_day_last{December}}; 68 for (int i = 0; i <= 10; ++i) 69 { 70 year_month_day_last ym1 = ym - years{i}; 71 assert(static_cast<int>(ym1.year()) == 1234 - i); 72 assert(ym1.month() == December); 73 } 74 } 75 76 { // year_month_day_last - months 77 ASSERT_NOEXCEPT( std::declval<year_month_day_last>() - std::declval<months>()); 78 ASSERT_SAME_TYPE(year_month_day_last, decltype(std::declval<year_month_day_last>() - std::declval<months>())); 79 80 static_assert(testConstexprMonths(year_month_day_last{year{1234}, month_day_last{December}}), ""); 81 // TODO test wrapping 82 year_month_day_last ym{year{1234}, month_day_last{December}}; 83 for (unsigned i = 0; i <= 10; ++i) 84 { 85 year_month_day_last ym1 = ym - months{i}; 86 assert(static_cast<int>(ym1.year()) == 1234); 87 assert(static_cast<unsigned>(ym1.month()) == 12U-i); 88 } 89 } 90 91 } 92
