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common
min_non_zero.h
Go to the documentation of this file.
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/* Copyright (C) 2018,2023 Olly Betts
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef XAPIAN_INCLUDED_MIN_NON_ZERO_H
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#define XAPIAN_INCLUDED_MIN_NON_ZERO_H
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#include <algorithm>
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#include <type_traits>
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template
<
typename
T>
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constexpr
typename
std::enable_if<std::is_unsigned<T>::value, T>::type
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min_non_zero
(
const
T& a,
const
T& b)
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{
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// To achieve the effect we want, we find the *maximum* after negating each
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// of the values (which for an unsigned type leaves 0 alone but flips the
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// order of all other values), then negate the answer.
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return
-std::max(-a, -b);
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}
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#endif // XAPIAN_INCLUDED_MIN_NON_ZERO_H
min_non_zero
constexpr std::enable_if< std::is_unsigned< T >::value, T >::type min_non_zero(const T &a, const T &b)
Return the smaller of two unsigned integers which isn't zero.
Definition:
min_non_zero.h:37
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