60 lines
1.4 KiB
C++
60 lines
1.4 KiB
C++
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// boost/chrono/round.hpp ------------------------------------------------------------//
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// (C) Copyright Howard Hinnant
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// Copyright 2011 Vicente J. Botet Escriba
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/chrono for documentation.
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#ifndef BOOST_CHRONO_ROUND_HPP
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#define BOOST_CHRONO_ROUND_HPP
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#include <boost/chrono/duration.hpp>
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#include <boost/chrono/duration.hpp>
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//#include <boost/chrono/typeof/boost/chrono/chrono.hpp>
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namespace boost
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{
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namespace chrono
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{
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/**
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* rounds to nearest, to even on tie
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*/
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template <class To, class Rep, class Period>
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To round(const duration<Rep, Period>& d)
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{
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typedef typename common_type<To, duration<Rep, Period> >::type result_type;
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result_type diff0;
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result_type diff1;
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To t0 = duration_cast<To>(d);
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To t1 = t0;
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if (t0>d) {
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--t1;
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diff0 = t0 - d;
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diff1 = d - t1;
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} else {
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++t1;
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diff0 = d - t0;
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diff1 = t1 - d;
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}
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if (diff0 == diff1)
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{
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if (t0.count() & 1)
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return t1;
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return t0;
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}
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else if (diff0 < diff1)
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return t0;
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return t1;
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}
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} // namespace chrono
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} // namespace boost
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#endif
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