flatten.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_TENSOR_FUNCTIONS_FLATTEN_H
#define pRC_CORE_TENSOR_FUNCTIONS_FLATTEN_H
 
#include <prc/core/basic/sequence.hpp>
#include <prc/core/tensor/declarations.hpp>
 
namespace pRC
{
    template<Index K, class X, IsTensorish R = RemoveReference<X>>
        requires(K < R::Dimension)
    static inline constexpr auto flatten(X &&a)
    {
        return expand(chip<K>(makeSeries<Index, R::Dimension>()),
            [&a](auto const... seq)
            {
                return reshape<R::size(K),
                    decltype(chip<K>(typename R::Sizes()))::size()>(
                    permute<K, seq...>(forward<X>(a)));
            });
    }
}
#endif // pRC_CORE_TENSOR_FUNCTIONS_FLATTEN_H