Function createSubArray

src/backend/cpu/Array.cpp:275–305

template<typename T>
Array<T> createSubArray(const Array<T> &parent, const vector<af_seq> &index,
                        bool copy) {
    parent.eval();

    dim4 dDims          = parent.getDataDims();
    dim4 parent_strides = parent.strides();

    if (parent.isLinear() == false) {
        const Array<T> parentCopy = copyArray(parent);
        return createSubArray(parentCopy, index, copy);
    }

    const dim4 &pDims = parent.dims();
    dim4 dims         = toDims(index, pDims);
    dim4 strides      = toStride(index, dDims);

    // Find total offsets after indexing
    dim4 offsets = toOffset(index, pDims);
    dim_t offset = parent.getOffset();
    for (int i = 0; i < 4; i++) { offset += offsets[i] * parent_strides[i]; }

    Array<T> out = Array<T>(parent, dims, offset, strides);

    if (!copy) { return out; }

    if (strides[0] != 1 || strides[1] < 0 || strides[2] < 0 || strides[3] < 0) {
        out = copyArray(out);
    }

    return out;
}

template<typename T>
void destroyArray(Array<T> *A) {