//
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// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
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//
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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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//
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// Official repository: https://github.com/boostorg/beast
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//
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#ifndef BOOST_BEAST_CORE_DETAIL_CLAMP_HPP
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#define BOOST_BEAST_CORE_DETAIL_CLAMP_HPP
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#include <cstdlib>
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#include <limits>
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#include <type_traits>
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namespace boost {
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namespace beast {
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namespace detail {
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template<class UInt>
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static
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std::size_t
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clamp(UInt x)
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{
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if(x >= (std::numeric_limits<std::size_t>::max)())
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return (std::numeric_limits<std::size_t>::max)();
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return static_cast<std::size_t>(x);
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}
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template<class UInt>
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static
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std::size_t
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clamp(UInt x, std::size_t limit)
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{
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if(x >= limit)
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return limit;
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return static_cast<std::size_t>(x);
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}
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// return `true` if x + y > z, which are unsigned
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template<
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class U1, class U2, class U3>
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constexpr
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bool
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sum_exceeds(U1 x, U2 y, U3 z)
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{
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static_assert(
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std::is_unsigned<U1>::value &&
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std::is_unsigned<U2>::value &&
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std::is_unsigned<U3>::value, "");
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return y > z || x > z - y;
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}
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} // detail
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} // beast
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} // boost
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#endif
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