negative_index_semantics.cpp

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#include "negative_index_semantics.h"
 
#include <algorithm>
 
size_t
armarx::armem::base::detail::negativeIndexSemantics(long index, size_t size)
{
    const size_t max = size > 0 ? size - 1 : 0;
    if (index >= 0)
    {
        return std::clamp<size_t>(static_cast<size_t>(index), 0, max);
    }
    else
    {
        return static_cast<size_t>(
            std::clamp<long>(static_cast<long>(size) + index, 0, static_cast<long>(max)));
    }
}