plus_minus_equal_month.pass.cpp (2495B)
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 months& d) noexcept; 15 // constexpr year_month& operator-=(const months& d) noexcept; 16 17 #include <chrono> 18 #include <type_traits> 19 #include <cassert> 20 21 #include "test_macros.h" 22 23 template <typename D, typename Ds> 24 constexpr bool testConstexpr(D d1) 25 { 26 if (static_cast<unsigned>((d1 ).month()) != 1) return false; 27 if (static_cast<unsigned>((d1 += Ds{ 1}).month()) != 2) return false; 28 if (static_cast<unsigned>((d1 += Ds{ 2}).month()) != 4) return false; 29 if (static_cast<unsigned>((d1 += Ds{12}).month()) != 4) return false; 30 if (static_cast<unsigned>((d1 -= Ds{ 1}).month()) != 3) return false; 31 if (static_cast<unsigned>((d1 -= Ds{ 2}).month()) != 1) return false; 32 if (static_cast<unsigned>((d1 -= Ds{12}).month()) != 1) return false; 33 return true; 34 } 35 36 int main() 37 { 38 using month = std::chrono::month; 39 using months = std::chrono::months; 40 using year = std::chrono::year; 41 using year_month = std::chrono::year_month; 42 43 ASSERT_NOEXCEPT( std::declval<year_month&>() += std::declval<months>()); 44 ASSERT_SAME_TYPE(year_month&, decltype(std::declval<year_month&>() += std::declval<months>())); 45 46 ASSERT_NOEXCEPT( std::declval<year_month&>() -= std::declval<months>()); 47 ASSERT_SAME_TYPE(year_month&, decltype(std::declval<year_month&>() -= std::declval<months>())); 48 49 static_assert(testConstexpr<year_month, months>(year_month{year{1234}, month{1}}), ""); 50 51 for (unsigned i = 0; i <= 10; ++i) 52 { 53 year y{1234}; 54 year_month ym(y, month{i}); 55 assert(static_cast<unsigned>((ym += months{2}).month()) == i + 2); 56 assert(ym.year() == y); 57 assert(static_cast<unsigned>((ym ).month()) == i + 2); 58 assert(ym.year() == y); 59 assert(static_cast<unsigned>((ym -= months{1}).month()) == i + 1); 60 assert(ym.year() == y); 61 assert(static_cast<unsigned>((ym ).month()) == i + 1); 62 assert(ym.year() == y); 63 } 64 }