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