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A generic, composable multi-dimensional array library.

License: MIT License

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cpp17 generic-programming header-only multidimensional-arrays ndarray numpy platformio tensor

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GCC std::optional error: initializations for multiple members of

std::optional on commit ed7fee5394e25316bc619f6a4414d78fa46965fa errored:

2024-05-23T14:31:24.9138165Z /usr/include/c++/12/optional:207:15: error: initializations for multiple members of 'std::_Optional_payload_base<nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::greater, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::less, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [1], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 1> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [1], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 1> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::less, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > > >::_Storage<nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::greater, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::less, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [1], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 1> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [1], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 1> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::less, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, true>'
2024-05-23T14:31:24.9237346Z   207 |         union _Storage
2024-05-23T14:31:24.9237987Z       |               ^~~~~~~~
2024-05-23T14:31:24.9457319Z /usr/include/c++/12/optional:164:7: note: synthesized method 'constexpr std::_Optional_payload_base<nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::greater, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::less, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [1], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 1> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [1], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 1> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::less, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > > >::_Storage<nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::greater, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::less, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [1], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 1> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [1], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 1> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::less, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, true>::_Storage(std::_Optional_payload_base<nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::greater, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::less, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [1], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 1> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [1], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 1> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::less, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > > >::_Storage<nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::greater, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::less, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [1], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 1> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [1], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 1> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::where_t, nmtools::view::decorator_t<nmtools::view::indexing_t, nmtools::view::decorator_t<nmtools::view::ufunc_t, nmtools::view::fun::less, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > >, nmtools::view::decorator_t<nmtools::view::indexing_t, signed char [3][2], nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, nmtools::view::broadcast_to_t<std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, std::tuple<nmtools::meta::integral_constant<long unsigned int, 3>, nmtools::meta::integral_constant<long unsigned int, 2> >, nmtools::array::hybrid_ndarray<unsigned char, 2, 1>, nmtools::meta::integral_constant<long unsigned int, 6> > > >, true>&&)' first required here
2024-05-23T14:31:24.9651957Z   164 |       _Optional_payload_base(_Optional_payload_base&&) = default;
2024-05-23T14:31:24.9653032Z       |       ^~~~~~~~~~~~~~~~~~~~~~

while it is working fine on clang, and works fine on gcc with NOSTL build:

add fixed size matrix support

add fibonacci search for one dimensional optimization

section 4.3 in

Antoniou A, Lu WS. Practical optimization: algorithms and engineering applications. Springer Science & Business Media; 2007 Dec 14.

add linear regression

least-squares fit of a straight line

add backtracking line search

references :
[1] https://people.maths.ox.ac.uk/hauser/hauser_lecture2.pdf
[2] https://en.wikipedia.org/wiki/Backtracking_line_search

update docker to include eigen & armadillo

clean-up cmake

make installable
easily find package
reduce duplication using macro/function

add code coverage reporting

add ode module

make finite difference to return value instead of taking reference

from

template <size_t order, Formulas formula = Formulas::Centered, typename F, typename Scalar>
        void finite_difference(F &f, Scalar x, Scalar step, Scalar &d)
        {
            detail::finite_difference(detail::Order<order>{}, detail::ComputeType<formula>{}, f, x, step, d);
        }

template <size_t order, Formulas formula = Formulas::Centered, typename F, typename Scalar>
        auto finite_difference(F &f, Scalar x, Scalar step)
        {
            return detail::finite_difference(detail::Order<order>{}, detail::ComputeType<formula>{}, f, x, step);
        }

add inexact line search

add matrix transpose

add gauss elimination

forward elimination
backward substitution
naive gauss elimination
gauss elimination with pivot & scales

add LU decomposition

add LU decompostion base and implemetation for eigen and armadillo backend

cleanup curvefit

make sinusoid to return value instead of taking reference
add docs
constexpr support

add decomposition and matrix inversion

lu decomposition
matrix inverse based on decomposition

extend linalg for fixed and dynamic array impl

extend and cleanup linalg module to support nmtools::array
more benchmarks

python bindings

Add support for python

drop fft

no longer support fft

concepts and constraints

refactor backend directory structure and namespace

refactor backend directory structure to gla/backend and update namepace accordingly

cleanup ode implementation

return value instead of taking reference
constexpr support
docs

init benchmarks

initial benchmarks using nanobench/google-benchmark

matrix support

init matrix support (eigen & armadillo backend)

add cubic interpolation for one dimensional interpolation

section 4.6 in

Antoniou A, Lu WS. Practical optimization: algorithms and engineering applications. Springer Science & Business Media; 2007 Dec 14.

cleanup interpolation module

use linalg::tridiagonal for solving spline
provide options to return callable instead of directly compute the results
clean-up meta functions
add linear splne

add inverse

add functional inverse frontend with eigen and armadillo backend

add matrix determinant

Extend backtracking line search for multivariable

multivariable support
constexpr support

add taylor series

add support to assign matrix from initializer list

add blas module

cleanup matvec, refactor to blas
saxpy, gaxpy, dot, outer, in addition to mul and add
constexpr support

add fft

recursive fft

add codecov integration

add elimination and decomposition for special matrices

thomas algorithm for tridiagonal matrix elimination
cholesky decomposition for symmetric matrix

clang constexpr error: constexpr variable 'result' must be initialized by a constant expression

clang & gcc disagree on contstexpr evaluation:

2024-06-01T09:08:52.7324596Z In file included from /work/tests/index/src/roll.cpp:1:
2024-06-01T09:08:52.7326602Z /work/include/nmtools/array/index/roll.hpp:278:32: error: constexpr variable 'result' must be initialized by a constant expression
2024-06-01T09:08:52.7344845Z                 constexpr auto result  = index::roll(shape,indices,shift,axis_t{});
2024-06-01T09:08:52.7345811Z                                ^         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2024-06-01T09:08:52.7354560Z /work/include/nmtools/meta/transform.hpp:73:5: note: in instantiation of template class 'nmtools::meta::resolve_optype<void, nmtools::index::roll_t, std::tuple<nmtools::meta::integral_constant<unsigned long, 2>, nmtools::meta::integral_constant<unsigned long, 4>>, std::tuple<nmtools::meta::integral_constant<unsigned long, 0>, nmtools::meta::integral_constant<unsigned long, 0>>, nmtools::meta::integral_constant<unsigned long, 1>, std::tuple<nmtools::meta::integral_constant<unsigned long, 1>, nmtools::meta::integral_constant<unsigned long, 0>>>' requested here
2024-06-01T09:08:52.7359228Z     using resolve_optype_t = typename resolve_optype<void,op_t,tparams...>::type;
2024-06-01T09:08:52.7360126Z     ^
2024-06-01T09:08:52.7362036Z /work/include/nmtools/array/index/roll.hpp:68:32: note: in instantiation of template type alias 'resolve_optype_t' requested here
2024-06-01T09:08:52.7363861Z         using result_t = meta::resolve_optype_t<roll_t,shape_t,indices_t,shift_t,axis_t>;
2024-06-01T09:08:52.7364807Z                                ^
2024-06-01T09:08:52.7374728Z /work/tests/index/src/roll.cpp:294:5: note: in instantiation of function template specialization 'nmtools::index::roll<std::tuple<nmtools::meta::integral_constant<unsigned long, 2>, nmtools::meta::integral_constant<unsigned long, 4>>, std::tuple<nmtools::meta::integral_constant<unsigned long, 0>, nmtools::meta::integral_constant<unsigned long, 0>>, nmtools::meta::integral_constant<unsigned long, 1>, std::tuple<nmtools::meta::integral_constant<unsigned long, 1>, nmtools::meta::integral_constant<unsigned long, 0>>>' requested here
2024-06-01T09:08:52.7380034Z     ROLL_SUBCASE( case2d1, shape_ct, indices_ct, shift_ct, axis_ct );
2024-06-01T09:08:52.7380837Z     ^
2024-06-01T09:08:52.7381715Z /work/tests/index/src/roll.cpp:12:35: note: expanded from macro 'ROLL_SUBCASE'
2024-06-01T09:08:52.7382794Z     auto result = nmtools::index::roll(__VA_ARGS__); \
2024-06-01T09:08:52.7383484Z                                   ^
2024-06-01T09:08:52.7386236Z /work/include/nmtools/array/index/roll.hpp:183:32: note: non-constexpr function 'operator()<unsigned long, std::tuple<nmtools::meta::integral_constant<unsigned long, 1>, nmtools::meta::integral_constant<unsigned long, 0>>>' cannot be used in a constant expression
2024-06-01T09:08:52.7388600Z                 auto m_shift = normalize_length(shift,axis);
2024-06-01T09:08:52.7389246Z                                ^
2024-06-01T09:08:52.7391498Z /work/include/nmtools/array/index/roll.hpp:278:42: note: in call to 'roll(shape, indices, shift, std::tuple<nmtools::meta::integral_constant<unsigned long, 1>, nmtools::meta::integral_constant<unsigned long, 0>>{})'
2024-06-01T09:08:52.7393643Z                 constexpr auto result  = index::roll(shape,indices,shift,axis_t{});
2024-06-01T09:08:52.7394518Z                                          ^
2024-06-01T09:08:52.7395361Z /work/include/nmtools/array/index/roll.hpp:98:37: note: declared here
2024-06-01T09:08:52.7399104Z             auto normalize_length = [](const auto& lhs, const auto& rhs){

success on gcc, but clang rejects

full clang logs (error):
job-logs-clang-index-error.txt
full gcc logs (success):
job-logs-gcc-index-success.txt

commit: cca38c3

compiler error notes: Clang constexpr variable lifetime

clang error: note: read of variable whose lifetime has ended

branch: https://github.com/alifahrri/nmtools/tree/clang-compile-error-constexpr-variable-lifetime

CI log (clang-14)

2022-10-01T13:26:22.6894603Z In file included from /work/tests/meta/array/view/moveaxis.cpp:5:
2022-10-01T13:26:22.6895063Z In file included from /work/include/nmtools/array/view/moveaxis.hpp:4:
2022-10-01T13:26:22.6895649Z In file included from /work/include/nmtools/array/index/argsort.hpp:5:
2022-10-01T13:26:22.6919427Z /work/include/nmtools/array/shape.hpp:242:47: error: non-type template argument is not a constant expression
2022-10-01T13:26:22.6939473Z                     }, nmtools_tuple<meta::ct<(size_t)at(fixed_shape,0)>>{});
2022-10-01T13:26:22.6943928Z                                               ^~~~~~~~~~~~~~~~~~~~~~~~~
2022-10-01T13:26:22.6951885Z /work/include/nmtools/array/view/transpose.hpp:42:50: note: in instantiation of function template specialization 'nmtools::shape<true, nmtools::array::ndarray_t<std::array<float, 12>, std::tuple<nmtools::meta::integral_constant<unsigned long, 1>, nmtools::meta::integral_constant<unsigned long, 2>, nmtools::meta::integral_constant<unsigned long, 6>>>>' requested here
2022-10-01T13:26:22.6956189Z         using src_shape_type = decltype(nmtools::shape</*force_constant_index*/true>(meta::declval<array_t>()));
2022-10-01T13:26:22.6959811Z                                                  ^
2022-10-01T13:26:22.6966252Z /work/include/nmtools/array/view/decorator.hpp:129:26: note: in instantiation of template class 'nmtools::view::transpose_t<nmtools::array::ndarray_t<std::array<float, 12>, std::tuple<nmtools::meta::integral_constant<unsigned long, 1>, nmtools::meta::integral_constant<unsigned long, 2>, nmtools::meta::integral_constant<unsigned long, 6>>>, std::tuple<nmtools::meta::integral_constant<unsigned long, 1>, nmtools::meta::integral_constant<unsigned long, 0>, nmtools::meta::integral_constant<unsigned long, 2>>>' requested here
2022-10-01T13:26:22.6971507Z     struct decorator_t : view_t<Ts...>
2022-10-01T13:26:22.6971763Z                          ^
2022-10-01T13:26:22.6983224Z /work/include/nmtools/array/view/transpose.hpp:100:16: note: in instantiation of template class 'nmtools::view::decorator_t<nmtools::view::transpose_t, nmtools::array::ndarray_t<std::array<float, 12>, std::tuple<nmtools::meta::integral_constant<unsigned long, 1>, nmtools::meta::integral_constant<unsigned long, 2>, nmtools::meta::integral_constant<unsigned long, 6>>>, std::tuple<nmtools::meta::integral_constant<unsigned long, 1>, nmtools::meta::integral_constant<unsigned long, 0>, nmtools::meta::integral_constant<unsigned long, 2>>>' requested here
2022-10-01T13:26:22.6984659Z         return decorator_t<transpose_t,array_t,axes_t>{{array,axes}};
2022-10-01T13:26:22.6984952Z                ^
2022-10-01T13:26:22.6992103Z /work/include/nmtools/array/view/moveaxis.hpp:37:56: note: in instantiation of function template specialization 'nmtools::view::transpose<nmtools::array::ndarray_t<std::array<float, 12>, std::tuple<nmtools::meta::integral_constant<unsigned long, 1>, nmtools::meta::integral_constant<unsigned long, 2>, nmtools::meta::integral_constant<unsigned long, 6>>>, std::tuple<nmtools::meta::integral_constant<unsigned long, 1>, nmtools::meta::integral_constant<unsigned long, 0>, nmtools::meta::integral_constant<unsigned long, 2>>>' requested here
2022-10-01T13:26:22.6994480Z         using result_t = meta::remove_cvref_t<decltype(transpose(array,*order))>;
2022-10-01T13:26:22.6995209Z                                                        ^
2022-10-01T13:26:22.7005677Z /work/tests/meta/array/view/moveaxis.cpp:54:44: note: in instantiation of function template specialization 'nmtools::view::moveaxis<nmtools::array::ndarray_t<std::array<float, 12>, std::tuple<nmtools::meta::integral_constant<unsigned long, 1>, nmtools::meta::integral_constant<unsigned long, 2>, nmtools::meta::integral_constant<unsigned long, 6>>>, nmtools::meta::integral_constant<unsigned long, 0>, nmtools::meta::integral_constant<unsigned long, 1>>' requested here
2022-10-01T13:26:22.7006825Z         using view_type   = decltype(view::moveaxis(meta::declval<array_type>(),meta::declval<src_type>(),meta::declval<dst_type>()));
2022-10-01T13:26:22.7008561Z                                            ^
2022-10-01T13:26:22.7013855Z /work/include/nmtools/array/shape.hpp:242:55: note: read of variable whose lifetime has ended
2022-10-01T13:26:22.7015592Z                     }, nmtools_tuple<meta::ct<(size_t)at(fixed_shape,0)>>{});
2022-10-01T13:26:22.7017908Z                                                       ^

works fine on gcc

                constexpr auto fixed_shape = meta::fixed_shape_v<array_t>;
                if constexpr (!meta::is_fail_v<decltype(fixed_shape)>) {
                    return meta::template_reduce<len(fixed_shape)-1>([&](auto init, auto index){
                        using init_type = decltype(init);
                        using type = meta::append_type_t<init_type,meta::ct<(size_t)at(fixed_shape,index+1)>>;
                        return type{};
                    }, nmtools_tuple<meta::ct<(size_t)at(fixed_shape,0)>>{});
                } else {
                    return impl::shape<array_t>(array);
                }

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