minus.pass.cpp (3527B)
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_weekday_last; 13 14 // constexpr year_month_weekday_last operator-(const year_month_weekday_last& ymwdl, const months& dm) noexcept; 15 // Returns: ymwdl + (-dm). 16 // 17 // constexpr year_month_weekday_last operator-(const year_month_weekday_last& ymwdl, const years& dy) noexcept; 18 // Returns: ymwdl + (-dy). 19 20 #include <chrono> 21 #include <type_traits> 22 #include <cassert> 23 24 #include "test_macros.h" 25 26 #include <iostream> 27 28 constexpr bool testConstexprYears(std::chrono::year_month_weekday_last ym) 29 { 30 std::chrono::years offset{14}; 31 if (static_cast<int>((ym ).year()) != 66) return false; 32 if (static_cast<int>((ym - offset).year()) != 52) return false; 33 return true; 34 } 35 36 constexpr bool testConstexprMonths(std::chrono::year_month_weekday_last ym) 37 { 38 std::chrono::months offset{6}; 39 if (static_cast<unsigned>((ym ).month()) != 10) return false; 40 if (static_cast<unsigned>((ym - offset).month()) != 4) return false; 41 return true; 42 } 43 44 int main() 45 { 46 using year = std::chrono::year; 47 using month = std::chrono::month; 48 using weekday = std::chrono::weekday; 49 using weekday_last = std::chrono::weekday_last; 50 using year_month_weekday_last = std::chrono::year_month_weekday_last; 51 using years = std::chrono::years; 52 using months = std::chrono::months; 53 54 constexpr month October = std::chrono::October; 55 constexpr weekday Tuesday = std::chrono::Tuesday; 56 57 { // year_month_weekday_last - years 58 59 ASSERT_NOEXCEPT( std::declval<year_month_weekday_last>() - std::declval<years>()); 60 ASSERT_SAME_TYPE(year_month_weekday_last, decltype(std::declval<year_month_weekday_last>() - std::declval<years>())); 61 62 static_assert(testConstexprYears(year_month_weekday_last{year{66}, October, weekday_last{Tuesday}}), ""); 63 64 year_month_weekday_last ym{year{1234}, October, weekday_last{Tuesday}}; 65 for (int i = 0; i <= 10; ++i) 66 { 67 year_month_weekday_last ym1 = ym - years{i}; 68 assert(ym1.year() == year{1234 - i}); 69 assert(ym1.month() == October); 70 assert(ym1.weekday() == Tuesday); 71 assert(ym1.weekday_last() == weekday_last{Tuesday}); 72 } 73 } 74 75 { // year_month_weekday_last - months 76 77 ASSERT_NOEXCEPT( std::declval<year_month_weekday_last>() - std::declval<months>()); 78 ASSERT_SAME_TYPE(year_month_weekday_last, decltype(std::declval<year_month_weekday_last>() - std::declval<months>())); 79 80 static_assert(testConstexprMonths(year_month_weekday_last{year{66}, October, weekday_last{Tuesday}}), ""); 81 82 year_month_weekday_last ym{year{1234}, October, weekday_last{Tuesday}}; 83 for (unsigned i = 0; i < 10; ++i) 84 { 85 year_month_weekday_last ym1 = ym - months{i}; 86 assert(ym1.year() == year{1234}); 87 assert(ym1.month() == month{10 - i}); 88 assert(ym1.weekday() == Tuesday); 89 assert(ym1.weekday_last() == weekday_last{Tuesday}); 90 } 91 } 92 93 }