Function copyData

src/backend/cuda/copy.cpp:26–35

template<typename T>
void copyData(T *data, const Array<T> &src) {
    if (src.elements() > 0) {
        Array<T> lin = src.isReady() && src.isLinear() ? src : copyArray(src);
        // out is now guaranteed linear
        auto stream = getActiveStream();
        CUDA_CHECK(cudaMemcpyAsync(data, lin.get(), lin.elements() * sizeof(T),
                                   cudaMemcpyDeviceToHost, stream));
        CUDA_CHECK(cudaStreamSynchronize(stream));
    }
}

template<typename T>
Array<T> copyArray(const Array<T> &src) {