forked from premiere/premiere-libtorrent
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
/*
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Copyright (c) 2017, Arvid Norberg, Alden Torres
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_NUMERIC_CAST_HPP
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#define TORRENT_NUMERIC_CAST_HPP
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#include <type_traits>
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#include <limits>
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#include "libtorrent/assert.hpp"
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namespace libtorrent { namespace aux {
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template <class T, class In, typename Cond = typename std::enable_if<
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std::is_integral<T>::value && std::is_integral<In>::value>::type>
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T numeric_cast(In v)
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{
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T r = static_cast<T>(v);
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TORRENT_ASSERT(v == static_cast<In>(r));
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TORRENT_ASSERT(std::is_unsigned<In>::value || std::is_signed<T>::value
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|| std::int64_t(v) >= 0);
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TORRENT_ASSERT(std::is_signed<In>::value || std::is_unsigned<T>::value
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|| std::size_t(v) <= std::size_t((std::numeric_limits<T>::max)()));
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return r;
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}
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// in C++ 17 you can use std::clamp
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template <class T>
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T clamp(T v, T lo, T hi)
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{
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TORRENT_ASSERT(lo <= hi);
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if (v < lo) return lo;
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if (hi < v) return hi;
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return v;
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}
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}}
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#endif
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