permute.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_TENSOR_FUNCTIONS_PERMUTE_H
#define pRC_CORE_TENSOR_FUNCTIONS_PERMUTE_H
 
#include <prc/core/basic/sequence.hpp>
#include <prc/core/functors/view.hpp>
#include <prc/core/tensor/views/permute.hpp>
 
namespace pRC
{
    template<Index... Ps, class X, IsTensorish R = RemoveReference<X>>
        requires requires { permute<Ps...>(typename R::Sizes()); }
    static inline constexpr auto permute(X &&a)
    {
        if constexpr(IsInvocable<View, X>)
        {
            using V = RemoveReference<decltype(view(forward<X>(a)))>;
            return TensorViews::Permute<typename R::Type,
                decltype(permute<Ps...>(typename R::Sizes())),
                Sequence<Index, Ps...>, V>(view(forward<X>(a)));
        }
        else
        {
            return eval(permute<Ps...>(a));
        }
    }
}
#endif // pRC_CORE_TENSOR_FUNCTIONS_PERMUTE_H