CircularBuffer.C

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    Copyright (C) 2022 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
template<class T>
void Foam::CircularBuffer<T>::doReserve
(
    const bool nocopy,
    const label len
)
{
    if (storage_.size() < len)
    {
        // Increase capacity (doubling)
        const label newCapacity =
            Foam::max(min_size(), Foam::max(len+1, label(2*storage_.size())));
 
            // OR
            // Foam::ListPolicy::reserve_size<min_size(), 2>
            // (
            //     len+1,
            //     storage_.size()
            // );
 
        if (nocopy || empty())
        {
            // Simple - no content to preserve
 
            clear();  // Reset begin/end
            storage_.resize_nocopy(newCapacity);
        }
        else
        {
            // Preserve content
            const labelRange range1 = range_one();
            const labelRange range2 = range_two();
 
            List<T> old(newCapacity);
            storage_.swap(old);
            begin_ = 0;
            end_ = 0;
 
            for (const label i : range1)
            {
                storage_[end_++] = std::move(old[i]);
            }
            for (const label i : range2)
            {
                storage_[end_++] = std::move(old[i]);
            }
        }
    }
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class T>
Foam::SubList<T> Foam::CircularBuffer<T>::array_one()
{
    const label len = size_one();
    return (len ? storage_.slice(begin_, len) : SubList<T>());
}
 
 
template<class T>
Foam::SubList<T> Foam::CircularBuffer<T>::array_two()
{
    const label len = size_two();
    return (len ? storage_.slice(0, len) : SubList<T>());
}
 
 
template<class T>
const Foam::SubList<T> Foam::CircularBuffer<T>::array_one() const
{
    const label len = size_one();
    return (len ? storage_.slice(begin_, len) : SubList<T>());
}
 
 
template<class T>
const Foam::SubList<T> Foam::CircularBuffer<T>::array_two() const
{
    const label len = size_two();
    return (len ? storage_.slice(0, len) : SubList<T>());
}
 
 
template<class T>
Foam::label Foam::CircularBuffer<T>::find(const T& val, label pos) const
{
    if (pos < 0) return -1;  // no-op
 
    label i = -1;
 
    const auto list1 = this->array_one();
 
    if (pos < list1.size())
    {
        // Can start search in first array
        i = list1.find(val, pos);
 
        // Position for continued search in second array
        pos = 0;
    }
    else
    {
        // Position for continued search in second array
        pos -= list1.size();
    }
 
    const auto list2 = this->array_two();
 
    if (i < 0 && list2.size())
    {
        // Not yet found, continue search in second array
        i = list2.find(val, pos);
 
        if (i >= 0)
        {
            // As flat index into the entire buffer
            i += list1.size();
        }
    }
 
    return i;
}
 
 
template<class T>
void Foam::CircularBuffer<T>::reverse()
{
    const label n = this->size();
    const label nBy2 = n/2;
 
    for (label i = 0; i < nBy2; ++i)
    {
        Foam::Swap(operator[](i), operator[](n-1-i));
    }
}
 
 
template<class T>
Foam::List<T> Foam::CircularBuffer<T>::list() const
{
    const auto list1 = array_one();
    const auto list2 = array_two();
 
    List<T> result(list1.size() + list2.size());
 
    if (list1.size())
    {
        result.slice(0, list1.size()) = list1;
    }
    if (list2.size())
    {
        result.slice(list1.size(), list1.size() + list2.size()) = list2;
    }
 
    return result;
}
 
 
// ************************************************************************* //