negate_unsigned.h

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/* Copyright (C) 2023 Olly Betts
 *
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 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
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 * The above copyright notice and this permission notice shall be included in
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#ifndef XAPIAN_INCLUDED_NEGATE_UNSIGNED_H
#define XAPIAN_INCLUDED_NEGATE_UNSIGNED_H
 
#include <type_traits>
 
template<typename T>
#ifdef __clang__
[[clang::no_sanitize("unsigned-integer-overflow")]]
#endif
inline constexpr typename std::enable_if_t<std::is_unsigned_v<T>, T>
negate_unsigned(T value)
{
#ifdef _MSC_VER
// Suppress warning about negating an unsigned type.
# pragma warning(push)
# pragma warning(disable:4146)
#endif
    return -value;
#ifdef _MSC_VER
# pragma warning(pop)
#endif
}
 
#endif // XAPIAN_INCLUDED_NEGATE_UNSIGNED_H