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55 lines
1.4 KiB
55 lines
1.4 KiB
// 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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To t0 = duration_cast<To>(d); |
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To t1 = t0; |
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++t1; |
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#if 0 |
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// Avoid the user of BOOST_AUTO to make the library portable to Sun, PGI, .. |
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BOOST_AUTO(diff0, d - t0); |
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BOOST_AUTO(diff1, t1 - d); |
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#else |
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typedef typename common_type<To, duration<Rep, Period> >::type result_type; |
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result_type diff0 = d - t0; |
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result_type diff1 = t1 - d; |
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#endif |
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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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