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