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88 lines
4.3 KiB
88 lines
4.3 KiB
#ifndef Magnum_Math_TimeStl_h |
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#define Magnum_Math_TimeStl_h |
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/* |
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This file is part of Magnum. |
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, |
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2020, 2021, 2022, 2023, 2024 |
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Vladimír Vondruš <mosra@centrum.cz> |
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Permission is hereby granted, free of charge, to any person obtaining a |
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copy of this software and associated documentation files (the "Software"), |
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to deal in the Software without restriction, including without limitation |
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the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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and/or sell copies of the Software, and to permit persons to whom the |
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Software is furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included |
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in all copies or substantial portions of the Software. |
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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 |
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THE 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 |
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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DEALINGS IN THE SOFTWARE. |
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*/ |
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/** @file |
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@brief STL @ref std::chrono compatibility for @ref Magnum::Math::Nanoseconds |
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@m_since_latest |
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Including this header allows you to convert a |
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@ref Magnum::Math::Nanoseconds from and to @ref std::chrono::duration and |
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@ref std::chrono::time_point. See @ref Math-Nanoseconds-stl for more |
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information. |
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*/ |
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#include <chrono> |
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#include "Magnum/Math/Time.h" |
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namespace Magnum { namespace Math { namespace Implementation { |
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/* There's no NanosecondsConverter<Long, std::time_t> because this is a typedef |
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to some integral type, which when simply picks the Nanoseconds(Long) |
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constructor and not a NanosecondsConverter. C types yay. */ |
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template<class Rep, std::intmax_t num, std::intmax_t denom> struct NanosecondsConverter<Long, std::chrono::duration<Rep, std::ratio<num, denom>>> { |
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constexpr static Nanoseconds<Long> from(std::chrono::duration<Rep, std::ratio<num, denom>> other) { |
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/* The Rep can be floating-point, truncate just the integral part but |
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only after converting to nanoseconds */ |
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return Nanoseconds<Long>{Long(other.count()*num*(1000000000ll/denom))}; |
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} |
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/* No to() because it can be an integer type, losing precision */ |
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/** @todo add a floating-point-only to() once desirable */ |
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}; |
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template<class Rep> struct NanosecondsConverter<Long, std::chrono::duration<Rep, std::nano>> { |
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constexpr static Nanoseconds<Long> from(std::chrono::duration<Rep, std::nano> other) { |
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/* The Rep can be floating-point, truncate just the integral part -- |
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we don't have anything for sub-nanosecond precision */ |
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return Nanoseconds<Long>{Long(other.count())}; |
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} |
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constexpr static std::chrono::duration<Rep, std::nano> to(Nanoseconds<Long> other) { |
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return std::chrono::duration<Rep, std::nano>{Long(other)}; |
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} |
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}; |
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template<class Clock, class Rep, std::intmax_t num, std::intmax_t denom> struct NanosecondsConverter<Long, std::chrono::time_point<Clock, std::chrono::duration<Rep, std::ratio<num, denom>>>> { |
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constexpr static Nanoseconds<Long> from(std::chrono::time_point<Clock, std::chrono::duration<Rep, std::ratio<num, denom>>> other) { |
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return Nanoseconds<Long>{other.time_since_epoch().count()*num*(1000000000ll/denom)}; |
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} |
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/* No to() because it's an integer type, losing precision */ |
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/** @todo is there even any std::chrono::time_point that would use a FP |
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duration type? */ |
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}; |
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template<class Clock, class Rep> struct NanosecondsConverter<Long, std::chrono::time_point<Clock, std::chrono::duration<Rep, std::nano>>> { |
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constexpr static Nanoseconds<Long> from(std::chrono::time_point<Clock, std::chrono::duration<Rep, std::nano>> other) { |
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return Nanoseconds<Long>{other.time_since_epoch().count()}; |
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} |
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constexpr static std::chrono::time_point<Clock, std::chrono::duration<Rep, std::nano>> to(Nanoseconds<Long> other) { |
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return std::chrono::time_point<Clock, std::chrono::duration<Rep, std::nano>>{std::chrono::duration<Rep, std::nano>{Long(other)}}; |
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} |
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}; |
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}}} |
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#endif
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