| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 |
| // <chrono> |
| |
| // template <class Duration> |
| // class hh_mm_ss |
| // { |
| // public: |
| // static unsigned constexpr fractional_width = see below; |
| // using precision = see below; |
| // |
| // fractional_width is the number of fractional decimal digits represented by precision. |
| // fractional_width has the value of the smallest possible integer in the range [0, 18] |
| // such that precision will exactly represent all values of Duration. |
| // If no such value of fractional_width exists, then fractional_width is 6. |
| |
| |
| #include <chrono> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| template <typename Duration, unsigned width> |
| constexpr bool check_width() |
| { |
| using HMS = std::chrono::hh_mm_ss<Duration>; |
| return HMS::fractional_width == width; |
| } |
| |
| int main(int, char**) |
| { |
| using microfortnights = std::chrono::duration<int, std::ratio<756, 625>>; |
| |
| static_assert( check_width<std::chrono::hours, 0>(), ""); |
| static_assert( check_width<std::chrono::minutes, 0>(), ""); |
| static_assert( check_width<std::chrono::seconds, 0>(), ""); |
| static_assert( check_width<std::chrono::milliseconds, 3>(), ""); |
| static_assert( check_width<std::chrono::microseconds, 6>(), ""); |
| static_assert( check_width<std::chrono::nanoseconds, 9>(), ""); |
| static_assert( check_width<std::chrono::duration<int, std::ratio< 1, 2>>, 1>(), ""); |
| static_assert( check_width<std::chrono::duration<int, std::ratio< 1, 3>>, 6>(), ""); |
| static_assert( check_width<std::chrono::duration<int, std::ratio< 1, 4>>, 2>(), ""); |
| static_assert( check_width<std::chrono::duration<int, std::ratio< 1, 5>>, 1>(), ""); |
| static_assert( check_width<std::chrono::duration<int, std::ratio< 1, 6>>, 6>(), ""); |
| static_assert( check_width<std::chrono::duration<int, std::ratio< 1, 7>>, 6>(), ""); |
| static_assert( check_width<std::chrono::duration<int, std::ratio< 1, 8>>, 3>(), ""); |
| static_assert( check_width<std::chrono::duration<int, std::ratio< 1, 9>>, 6>(), ""); |
| static_assert( check_width<std::chrono::duration<int, std::ratio< 1, 10>>, 1>(), ""); |
| static_assert( check_width<microfortnights, 4>(), ""); |
| |
| return 0; |
| } |