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++98, c++03, c++11, c++14, c++17
9
10 // <chrono>
11 // class weekday;
12
13 // constexpr unsigned iso_encoding() const noexcept;
14 // Returns the underlying weekday, _except_ that returns '7' for Sunday (zero)
15 // See [time.cal.wd.members]
16
17 #include <chrono>
18 #include <type_traits>
19 #include <cassert>
20
21 #include "test_macros.h"
22
23 template <typename WD>
testConstexpr()24 constexpr bool testConstexpr()
25 {
26 WD wd{5};
27 return wd.c_encoding() == 5;
28 }
29
main(int,char **)30 int main(int, char**)
31 {
32 using weekday = std::chrono::weekday;
33
34 ASSERT_NOEXCEPT( std::declval<weekday&>().iso_encoding());
35 ASSERT_SAME_TYPE(unsigned, decltype(std::declval<weekday&>().iso_encoding()));
36
37 static_assert(testConstexpr<weekday>(), "");
38
39 // This is different than all the other tests, because the '7' gets converted to
40 // a zero in the constructor, but then back to '7' by iso_encoding().
41 for (unsigned i = 0; i <= 10; ++i)
42 {
43 weekday wd(i);
44 assert(wd.iso_encoding() == (i == 0 ? 7 : i));
45 }
46
47 return 0;
48 }
49