1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8// UNSUPPORTED: c++03, c++11, c++14, c++17
9
10// <chrono>
11// class weekday;
12
13// constexpr weekday operator+(const days& x, const weekday& y) noexcept;
14// Returns: weekday(int{x} + y.count()).
15//
16// constexpr weekday operator+(const weekday& x, const days& y) noexcept;
17// Returns:
18// weekday{modulo(static_cast<long long>(unsigned{x}) + y.count(), 7)}
19// where modulo(n, 7) computes the remainder of n divided by 7 using Euclidean division.
20// [Note: Given a divisor of 12, Euclidean division truncates towards negative infinity
21// and always produces a remainder in the range of [0, 6].
22// Assuming no overflow in the signed summation, this operation results in a weekday
23// holding a value in the range [0, 6] even if !x.ok(). -end note]
24// [Example: Monday + days{6} == Sunday. -end example]
25
26#include <chrono>
27#include <cassert>
28#include <type_traits>
29#include <utility>
30
31#include "test_macros.h"
32#include "../../euclidian.h"
33
34using weekday = std::chrono::weekday;
35using days = std::chrono::days;
36
37constexpr bool test() {
38 for (unsigned i = 0; i <= 6; ++i)
39 for (unsigned j = 0; j <= 6; ++j) {
40 weekday wd1 = weekday{i} + days{j};
41 weekday wd2 = days{j} + weekday{i};
42 assert(wd1 == wd2);
43 assert((wd1.c_encoding() == euclidian_addition<unsigned, 0, 6>(i, j)));
44 assert((wd2.c_encoding() == euclidian_addition<unsigned, 0, 6>(i, j)));
45 }
46
47 // Check the example
48 assert(weekday{1} + days{6} == weekday{0});
49 return true;
50}
51
52int main(int, char**) {
53 ASSERT_NOEXCEPT(std::declval<weekday>() + std::declval<days>());
54 ASSERT_SAME_TYPE(weekday, decltype(std::declval<weekday>() + std::declval<days>()));
55
56 ASSERT_NOEXCEPT(std::declval<days>() + std::declval<weekday>());
57 ASSERT_SAME_TYPE(weekday, decltype(std::declval<days>() + std::declval<weekday>()));
58
59 test();
60 static_assert(test());
61
62 return 0;
63}
64

source code of libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/plus.pass.cpp