minus.pass.cpp (3030B)
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 + -dy. 16 // 17 // constexpr year_month operator-(const year_month& ym, const months& dm) noexcept; 18 // Returns: ym + -dm. 19 // 20 // constexpr months operator-(const year_month& x, const year_month& y) noexcept; 21 // Returns: x.year() - y.year() + months{static_cast<int>(unsigned{x.month()}) - 22 // static_cast<int>(unsigned{y.month()})} 23 24 25 #include <chrono> 26 #include <type_traits> 27 #include <cassert> 28 29 #include "test_macros.h" 30 31 #include <iostream> 32 33 int main() 34 { 35 using year = std::chrono::year; 36 using years = std::chrono::years; 37 using month = std::chrono::month; 38 using months = std::chrono::months; 39 using year_month = std::chrono::year_month; 40 41 { // year_month - years 42 ASSERT_NOEXCEPT( std::declval<year_month>() - std::declval<years>()); 43 ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() - std::declval<years>())); 44 45 // static_assert(testConstexprYears (year_month{year{1}, month{1}}), ""); 46 47 year_month ym{year{1234}, std::chrono::January}; 48 for (int i = 0; i <= 10; ++i) 49 { 50 year_month ym1 = ym - years{i}; 51 assert(static_cast<int>(ym1.year()) == 1234 - i); 52 assert(ym1.month() == std::chrono::January); 53 } 54 } 55 56 { // year_month - months 57 ASSERT_NOEXCEPT( std::declval<year_month>() - std::declval<months>()); 58 ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() - std::declval<months>())); 59 60 // static_assert(testConstexprMonths(year_month{year{1}, month{1}}), ""); 61 62 year_month ym{year{1234}, std::chrono::November}; 63 for (int i = 0; i <= 10; ++i) // TODO test wrap-around 64 { 65 year_month ym1 = ym - months{i}; 66 assert(static_cast<int>(ym1.year()) == 1234); 67 assert(ym1.month() == month(11 - i)); 68 } 69 } 70 71 { // year_month - year_month 72 ASSERT_NOEXCEPT( std::declval<year_month>() - std::declval<year_month>()); 73 ASSERT_SAME_TYPE(months, decltype(std::declval<year_month>() - std::declval<year_month>())); 74 75 // static_assert(testConstexprMonths(year_month{year{1}, month{1}}), ""); 76 77 // Same year 78 year y{2345}; 79 for (int i = 1; i <= 12; ++i) 80 for (int j = 1; j <= 12; ++j) 81 { 82 months diff = year_month{y, month(i)} - year_month{y, month(j)}; 83 std::cout << "i: " << i << " j: " << j << " -> " << diff.count() << std::endl; 84 assert(diff.count() == i - j); 85 } 86 87 // TODO: different year 88 89 } 90 }