is_unitary.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_TENSOR_OPERATOR_FUNCTIONS_IS_UNITARY_H
#define pRC_CORE_TENSOR_OPERATOR_FUNCTIONS_IS_UNITARY_H
 
#include <prc/core/functors/adjoint.hpp>
#include <prc/core/tensor/declarations.hpp>
#include <prc/core/value/limits.hpp>
 
namespace pRC
{
    template<class X, IsTensorish R = RemoveReference<X>, IsValue TT = Value<R>>
        requires IsInvocable<Adjoint, X>
    static inline constexpr auto isUnitary(X &&a,
        TT const &tolerance = NumericLimits<TT>::tolerance())
    {
        return isIdentity(adjoint(a) * a, tolerance);
    }
}
#endif // pRC_CORE_TENSOR_OPERATOR_FUNCTIONS_IS_UNITARY_H