Method from_permutation

src/shape.cpp:359–367

shape::shape(std::shared_ptr<shape_impl> pimpl) : impl(std::move(pimpl)) {}

shape shape::from_permutation(type_t t,
                              const std::vector<std::size_t>& l,
                              const std::vector<int64_t>& perm)
{
    auto new_lens = reorder_dims(l, perm);
    shape result  = reorder_shape({t, new_lens}, invert_permutation(perm));
    assert(result.lens() == l);
    return result;
}

shape::type_t shape::type() const { return impl->m_type; }