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71 lines
2.4 KiB
C++
71 lines
2.4 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 weekday;
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// constexpr weekday operator+(const days& x, const weekday& y) noexcept;
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// Returns: weekday(int{x} + y.count()).
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//
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// constexpr weekday operator+(const weekday& x, const days& y) noexcept;
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// Returns:
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// weekday{modulo(static_cast<long long>(unsigned{x}) + y.count(), 7)}
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// where modulo(n, 7) computes the remainder of n divided by 7 using Euclidean division.
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// [Note: Given a divisor of 12, Euclidean division truncates towards negative infinity
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// and always produces a remainder in the range of [0, 6].
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// Assuming no overflow in the signed summation, this operation results in a weekday
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// holding a value in the range [0, 6] even if !x.ok(). —end note]
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// [Example: Monday + days{6} == Sunday. —end example]
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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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#include "../../euclidian.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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M m{1};
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Ms offset{4};
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if (m + offset != M{5}) return false;
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if (offset + m != M{5}) return false;
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// Check the example
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if (M{1} + Ms{6} != M{0}) return false;
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return true;
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}
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int main()
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{
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using weekday = std::chrono::weekday;
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using days = std::chrono::days;
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ASSERT_NOEXCEPT( std::declval<weekday>() + std::declval<days>());
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ASSERT_SAME_TYPE(weekday, decltype(std::declval<weekday>() + std::declval<days>()));
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ASSERT_NOEXCEPT( std::declval<days>() + std::declval<weekday>());
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ASSERT_SAME_TYPE(weekday, decltype(std::declval<days>() + std::declval<weekday>()));
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static_assert(testConstexpr<weekday, days>(), "");
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for (unsigned i = 0; i <= 6; ++i)
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for (unsigned j = 0; j <= 6; ++j)
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{
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weekday wd1 = weekday{i} + days{j};
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weekday wd2 = days{j} + weekday{i};
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assert(wd1 == wd2);
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assert((static_cast<unsigned>(wd1) == euclidian_addition<unsigned, 0, 6>(i, j)));
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assert((static_cast<unsigned>(wd2) == euclidian_addition<unsigned, 0, 6>(i, j)));
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}
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}
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