scale.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_TENSOR_FUNCTIONS_SCALE_H
#define pRC_CORE_TENSOR_FUNCTIONS_SCALE_H
 
#include <prc/core/basic/functions/unit.hpp>
#include <prc/core/functors/div.hpp>
#include <prc/core/functors/mul.hpp>
#include <prc/core/functors/tensor_product.hpp>
#include <prc/core/tensor/declarations.hpp>
 
namespace pRC
{
    template<class XA, class XB, IsTensorish RA = RemoveReference<XA>,
        IsTensorish RB = RemoveReference<XB>>
        requires(RA::Dimension == 0 || RB::Dimension == 0) &&
        IsInvocable<TensorProduct, XA, XB>
    static inline constexpr auto operator*(XA &&a, XB &&b)
    {
        return tensorProduct(forward<XA>(a), forward<XB>(b));
    }
 
    template<class XA, class XB, IsTensorish RA = RemoveReference<XA>,
        IsTensorish RB = RemoveReference<XB>>
        requires(RA::Dimension == 0 && RB::Dimension != 0) &&
        IsInvocable<Div, typename RB::template ChangeType<typename RA::Type>,
            XB>
    static inline constexpr auto operator/(XA &&a, XB &&b)
    {
        return unit<typename RB::template ChangeType<typename RA::Type>>(
                   forward<XA>(a)()) /
            forward<XB>(b);
    }
 
    template<class XA, class XB, IsTensorish RA = RemoveReference<XA>,
        IsTensorish RB = RemoveReference<XB>>
        requires(RA::Dimension != 0 && RB::Dimension == 0) &&
        IsInvocable<Div, XA,
            typename RA::template ChangeType<typename RB::Type>>
    static inline constexpr auto operator/(XA &&a, XB &&b)
    {
        return forward<XA>(a) /
            unit<typename RA::template ChangeType<typename RB::Type>>(
                forward<XB>(b)());
    }
 
    template<class XA, class XB, IsTensorish RA = RemoveReference<XA>,
        class RB = RemoveReference<XB>>
        requires IsDefined<Tensor<RB>> && IsInvocable<Mul, XA, Tensor<RB>>
    static inline constexpr auto operator*(XA &&a, XB &&b)
    {
        return forward<XA>(a) * unit<Tensor<RB>>(forward<XB>(b));
    }
 
    template<class XA, class XB, class RA = RemoveReference<XA>,
        IsTensorish RB = RemoveReference<XB>>
        requires IsDefined<Tensor<RA>> && IsInvocable<Mul, Tensor<RA>, XB>
    static inline constexpr auto operator*(XA &&a, XB &&b)
    {
        return unit<Tensor<RA>>(forward<XA>(a)) * forward<XB>(b);
    }
 
    template<class XA, class XB, IsTensorish RA = RemoveReference<XA>,
        class RB = RemoveReference<XB>>
        requires IsDefined<Tensor<RB>> && IsInvocable<Div, XA, Tensor<RB>>
    static inline constexpr auto operator/(XA &&a, XB &&b)
    {
        return forward<XA>(a) / unit<Tensor<RB>>(forward<XB>(b));
    }
 
    template<class XA, class XB, class RA = RemoveReference<XA>,
        IsTensorish RB = RemoveReference<XB>>
        requires IsDefined<Tensor<RA>> && IsInvocable<Div, Tensor<RA>, XB>
    static inline constexpr auto operator/(XA &&a, XB &&b)
    {
        return unit<Tensor<RA>>(forward<XA>(a)) / forward<XB>(b);
    }
}
#endif // pRC_CORE_TENSOR_FUNCTIONS_SCALE_H