65 lines
2.5 KiB
C++
65 lines
2.5 KiB
C++
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// The MIT License (MIT)
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//
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// Copyright (c) 2017 Howard Hinnant
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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// width<n>::value is the number of fractional decimal digits in 1/n
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// width<0>::value and width<1>::value are defined to be 0
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// If 1/n takes more than 18 fractional decimal digits,
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// the result is truncated to 19.
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// Example: width<2>::value == 1
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// Example: width<3>::value == 19
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// Example: width<4>::value == 2
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// Example: width<10>::value == 1
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// Example: width<1000>::value == 3
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// template <std::uint64_t n>
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//
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// struct width
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// {
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// static constexpr unsigned value = ...;
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// };
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#include "date.h"
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#include <cassert>
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#include <sstream>
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#include <type_traits>
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int
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main()
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{
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using namespace date::detail;
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static_assert(width<0, 1>::value == 0, "");
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static_assert(width<1, 1>::value == 0, "");
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static_assert(width<1, 2>::value == 1, "");
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static_assert(width<1, 3>::value == 19, "");
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static_assert(width<1, 4>::value == 2, "");
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static_assert(width<1, 5>::value == 1, "");
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static_assert(width<1, 6>::value == 19, "");
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static_assert(width<1, 7>::value == 19, "");
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static_assert(width<1, 8>::value == 3, "");
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static_assert(width<1, 9>::value == 19, "");
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static_assert(width<1, 10>::value == 1, "");
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static_assert(width<1, 100>::value == 2, "");
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static_assert(width<1, 1000>::value == 3, "");
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static_assert(width<1, 10000>::value == 4, "");
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static_assert(width<756, 625>::value == 4, "");
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}
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