is_off_diagonal.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_TENSOR_OPERATOR_FUNCTIONS_IS_OFF_DIAGONAL_H
#define pRC_CORE_TENSOR_OPERATOR_FUNCTIONS_IS_OFF_DIAGONAL_H
 
#include <prc/core/functors/is_approx.hpp>
#include <prc/core/functors/off_diagonal.hpp>
#include <prc/core/tensor/operator/functions/off_diagonal.hpp>
#include <prc/core/tensor/type_traits.hpp>
#include <prc/core/value/limits.hpp>
 
namespace pRC
{
    template<class X, class R = RemoveReference<X>, If<IsTensorish<R>> = 0,
        If<IsInvocable<OffDiagonal, X>> = 0,
        If<IsInvocable<IsApprox, ResultOf<OffDiagonal, X>, X>> = 0,
        class TT = typename R::Value>
    static inline constexpr auto isOffDiagonal(X &&a,
        TT const &tolerance = NumericLimits<TT>::tolerance())
    {
        return isApprox(offDiagonal(a), a, tolerance);
    }
}
#endif // pRC_CORE_TENSOR_OPERATOR_FUNCTIONS_IS_OFF_DIAGONAL_H