scale.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_TENSOR_TRAIN_COMMON_FUNCTIONS_SCALE_H
#define pRC_TENSOR_TRAIN_COMMON_FUNCTIONS_SCALE_H
 
#include <prc/core/functors/div.hpp>
#include <prc/core/functors/mul.hpp>
#include <prc/core/functors/view.hpp>
#include <prc/core/tensor/declarations.hpp>
#include <prc/tensor_train/operator/declarations.hpp>
#include <prc/tensor_train/tensor/declarations.hpp>
 
namespace pRC
{
    template<class XA, class XB, class RA = RemoveReference<XA>,
        class RB = RemoveReference<XB>>
        requires(TensorTrain::IsTensorish<RA> ||
                    TensorTrain::IsOperatorish<RA>) &&
        (IsValue<RB> || IsComplex<RB>) &&
        IsInvocable<Mul, typename RA::Type, RB const &>
    static inline constexpr auto operator*(XA &&a, XB &&b)
    {
        return enumerate(
            [lambda = pow(abs(b), rcp(unit<RB>(RA::Dimension))),
                sgn = sign(b)]<Index C>(auto &&a)
            {
                if constexpr(C == 0)
                {
                    return forward<decltype(a)>(a) * sgn * lambda;
                }
                else
                {
                    return forward<decltype(a)>(a) * lambda;
                }
            },
            forward<XA>(a));
    }
 
    template<class XA, class XB, class RA = RemoveReference<XA>,
        class RB = RemoveReference<XB>>
        requires(IsValue<RA> || IsComplex<RA>) &&
        (TensorTrain::IsTensorish<RB> || TensorTrain::IsOperatorish<RB>) &&
        IsInvocable<Mul, RA const &, typename RB::Type>
    static inline constexpr auto operator*(XA &&a, XB &&b)
    {
        return forward<XB>(b) * forward<XA>(a);
    }
 
    template<class XA, class XB, class RA = RemoveReference<XA>,
        class RB = RemoveReference<XB>>
        requires(TensorTrain::IsTensorish<RA> ||
                    TensorTrain::IsOperatorish<RA>) &&
        (IsValue<RB> || IsComplex<RB>) &&
        IsInvocable<Div, typename RA::Type, RB const &>
    static inline constexpr auto operator/(XA &&a, XB &&b)
    {
        using T = ResultOf<Div, typename RA::Type, RB const &>;
 
        return forward<XA>(a) * rcp(cast<Value<T>>(forward<XB>(b)));
    }
 
    template<class XA, class XB, class RA = RemoveReference<XA>,
        class RB = RemoveReference<XB>>
        requires(TensorTrain::IsTensorish<RA> ||
                    TensorTrain::IsOperatorish<RA>) &&
        IsTensorish<RB> && IsInvocable<Mul, XA, typename RB::Type>
    static inline constexpr auto operator*(XA &&a, XB &&b)
    {
        return forward<XA>(a) * forward<XB>(b)();
    }
 
    template<class XA, class XB, class RA = RemoveReference<XA>,
        class RB = RemoveReference<XB>>
        requires IsTensorish<RA> &&
        (TensorTrain::IsTensorish<RB> || TensorTrain::IsOperatorish<RB>) &&
        IsInvocable<Mul, typename RA::Type, XB>
    static inline constexpr auto operator*(XA &&a, XB &&b)
    {
        return forward<XA>(a)() * forward<XB>(b);
    }
 
    template<class XA, class XB, class RA = RemoveReference<XA>,
        class RB = RemoveReference<XB>>
        requires(TensorTrain::IsTensorish<RA> ||
                    TensorTrain::IsOperatorish<RA>) &&
        IsTensorish<RB> && IsInvocable<Div, XA, typename RB::Type>
    static inline constexpr auto operator/(XA &&a, XB &&b)
    {
        return forward<XA>(a) / forward<XB>(b)();
    }
}
#endif // pRC_TENSOR_TRAIN_COMMON_FUNCTIONS_SCALE_H