concatenate.hpp

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#pragma once
 
#include <initializer_list>
#include <vector>
 
#include "NumCpp/Core/Internal/StlAlgorithms.hpp"
#include "NumCpp/Core/Shape.hpp"
#include "NumCpp/Core/Types.hpp"
#include "NumCpp/Functions/column_stack.hpp"
#include "NumCpp/Functions/row_stack.hpp"
 
namespace nc
{
    namespace detail
    {
        //============================================================================
        // Method Description:
        template<typename dtype, typename Iterator>
        NdArray<dtype> concatenate(Iterator begin, Iterator end, Axis inAxis = Axis::NONE)
        {
            switch (inAxis)
            {
                case Axis::NONE:
                {
                    uint32 finalSize = 0;
                    auto   iter      = begin;
                    while (iter != end)
                    {
                        const auto& ndarray = *iter++;
                        finalSize += ndarray.size();
                    }
 
                    NdArray<dtype> returnArray(1, finalSize);
                    uint32         offset = 0;
                    iter                  = begin;
                    while (iter != end)
                    {
                        const auto& ndarray = *iter++;
                        stl_algorithms::copy(ndarray.cbegin(), ndarray.cend(), returnArray.begin() + offset);
                        offset += ndarray.size();
                    }
 
                    return returnArray;
                }
                case Axis::ROW:
                {
                    return row_stack<dtype>(begin, end);
                }
                case Axis::COL:
                {
                    return column_stack<dtype>(begin, end);
                }
                default:
                {
                    THROW_INVALID_ARGUMENT_ERROR("Unimplemented axis type.");
                    return {}; // get rid of compiler warning
                }
            }
        }
    } // namespace detail
 
    //============================================================================
    // Method Description:
    template<typename dtype>
    NdArray<dtype> concatenate(const std::initializer_list<NdArray<dtype>>& inArrayList, Axis inAxis = Axis::NONE)
    {
        return detail::concatenate<dtype>(inArrayList.begin(), inArrayList.end(), inAxis);
    }
 
    //============================================================================
    // Method Description:
    template<typename dtype>
    NdArray<dtype> concatenate(const std::vector<NdArray<dtype>>& inArrayList, Axis inAxis = Axis::NONE)
    {
        return detail::concatenate<dtype>(inArrayList.begin(), inArrayList.end(), inAxis);
    }
} // namespace nc