trace.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_TENSOR_OPERATOR_FUNCTIONS_TRACE_H
#define pRC_CORE_TENSOR_OPERATOR_FUNCTIONS_TRACE_H
 
#include <prc/core/functors/extract_diagonal.hpp>
#include <prc/core/tensor/declarations.hpp>
 
namespace pRC
{
    template<class X, IsTensorish R = RemoveReference<X>>
        requires IsInvocable<ExtractDiagonal, X>
    static inline constexpr auto trace(X &&a)
    {
        return reduce<Add>(extractDiagonal(forward<X>(a)));
    }
}
#endif // pRC_CORE_TENSOR_OPERATOR_FUNCTIONS_TRACE_H