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; 13 14 // constexpr year_month operator+(const year_month& ym, const years& dy) noexcept; 15 // Returns: (ym.year() + dy) / ym.month(). 16 // 17 // constexpr year_month operator+(const years& dy, const year_month& ym) noexcept; 18 // Returns: ym + dy. 19 // 20 // constexpr year_month operator+(const year_month& ym, const months& dm) noexcept; 21 // Returns: A year_month value z such that z - ym == dm. 22 // Complexity: O(1) with respect to the value of dm. 23 // 24 // constexpr year_month operator+(const months& dm, const year_month& ym) noexcept; 25 // Returns: ym + dm. 26 27 28 29 #include <chrono> 30 #include <type_traits> 31 #include <cassert> 32 33 #include "test_macros.h" 34 35 constexpr bool testConstexprYears(std::chrono::year_month ym) 36 { 37 std::chrono::years offset{23}; 38 if (static_cast<int>((ym ).year()) != 1) return false; 39 if (static_cast<int>((ym + offset).year()) != 24) return false; 40 if (static_cast<int>((offset + ym).year()) != 24) return false; 41 return true; 42 } 43 44 45 constexpr bool testConstexprMonths(std::chrono::year_month ym) 46 { 47 std::chrono::months offset{6}; 48 if (static_cast<unsigned>((ym ).month()) != 1) return false; 49 if (static_cast<unsigned>((ym + offset).month()) != 7) return false; 50 if (static_cast<unsigned>((offset + ym).month()) != 7) return false; 51 return true; 52 } 53 54 55 int main() 56 { 57 using year = std::chrono::year; 58 using years = std::chrono::years; 59 using month = std::chrono::month; 60 using months = std::chrono::months; 61 using year_month = std::chrono::year_month; 62 63 { // year_month + years 64 ASSERT_NOEXCEPT(std::declval<year_month>() + std::declval<years>()); 65 ASSERT_NOEXCEPT(std::declval<years>() + std::declval<year_month>()); 66 67 ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() + std::declval<years>())); 68 ASSERT_SAME_TYPE(year_month, decltype(std::declval<years>() + std::declval<year_month>())); 69 70 static_assert(testConstexprYears (year_month{year{1}, month{1}}), ""); 71 72 year_month ym{year{1234}, std::chrono::January}; 73 for (int i = 0; i <= 10; ++i) 74 { 75 year_month ym1 = ym + years{i}; 76 year_month ym2 = years{i} + ym; 77 assert(static_cast<int>(ym1.year()) == i + 1234); 78 assert(static_cast<int>(ym2.year()) == i + 1234); 79 assert(ym1.month() == std::chrono::January); 80 assert(ym2.month() == std::chrono::January); 81 assert(ym1 == ym2); 82 } 83 } 84 85 { // year_month + months 86 ASSERT_NOEXCEPT(std::declval<year_month>() + std::declval<months>()); 87 ASSERT_NOEXCEPT(std::declval<months>() + std::declval<year_month>()); 88 89 ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() + std::declval<months>())); 90 ASSERT_SAME_TYPE(year_month, decltype(std::declval<months>() + std::declval<year_month>())); 91 92 static_assert(testConstexprMonths(year_month{year{1}, month{1}}), ""); 93 94 year_month ym{year{1234}, std::chrono::January}; 95 for (int i = 0; i <= 10; ++i) // TODO test wrap-around 96 { 97 year_month ym1 = ym + months{i}; 98 year_month ym2 = months{i} + ym; 99 assert(static_cast<int>(ym1.year()) == 1234); 100 assert(static_cast<int>(ym2.year()) == 1234); 101 assert(ym1.month() == month(1 + i)); 102 assert(ym2.month() == month(1 + i)); 103 assert(ym1 == ym2); 104 } 105 } 106 } 107
