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73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// <chrono>
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// class month;
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// constexpr month operator-(const month& x, const months& y) noexcept;
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// Returns: x + -y.
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//
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// constexpr months operator-(const month& x, const month& y) noexcept;
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// Returns: If x.ok() == true and y.ok() == true, returns a value m in the range
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// [months{0}, months{11}] satisfying y + m == x.
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// Otherwise the value returned is unspecified.
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// [Example: January - February == months{11}. —end example]
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extern "C" int printf(const char *, ...);
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#include <chrono>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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template <typename M, typename Ms>
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constexpr bool testConstexpr()
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{
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{
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M m{5};
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Ms offset{3};
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if (m - offset != M{2}) return false;
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if (m - M{2} != offset) return false;
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}
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// Check the example
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if (M{1} - M{2} != Ms{11}) return false;
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return true;
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}
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#include <iostream>
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int main()
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{
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using month = std::chrono::month;
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using months = std::chrono::months;
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ASSERT_NOEXCEPT(std::declval<month>() - std::declval<months>());
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ASSERT_NOEXCEPT(std::declval<month>() - std::declval<month>());
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ASSERT_SAME_TYPE(month , decltype(std::declval<month>() - std::declval<months>()));
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ASSERT_SAME_TYPE(months, decltype(std::declval<month>() - std::declval<month> ()));
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static_assert(testConstexpr<month, months>(), "");
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month m{6};
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for (unsigned i = 1; i <= 12; ++i)
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{
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month m1 = m - months{i};
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// months off = m - month {i};
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int exp = 6 - i;
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if (exp < 1)
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exp += 12;
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assert(static_cast<unsigned>(m1) == static_cast<unsigned>(exp));
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// assert(off.count() == static_cast<unsigned>(exp));
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}
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}
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