conjugated_scalar.hpp

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// SPDX-License-Identifier: BSL-1.0
 
#ifndef TETL_LINALG_CONJUGATED_SCALAR_HPP
#define TETL_LINALG_CONJUGATED_SCALAR_HPP
 
#include <etl/_concepts/same_as.hpp>
#include <etl/_linalg/concepts.hpp>
#include <etl/_linalg/proxy_reference.hpp>
#include <etl/_type_traits/declval.hpp>
 
namespace etl::linalg::detail {
 
template <typename ReferenceValue>
concept conjugatable = requires {
    { conj_if_needed(declval<ReferenceValue>()) } -> same_as<ReferenceValue>;
};
 
template <typename Reference, conjugatable ReferenceValue>
struct conjugated_scalar : proxy_reference<Reference, ReferenceValue, conjugated_scalar<Reference, ReferenceValue>> {
    using value_type = decltype(conj_if_needed(ReferenceValue(declval<Reference>())));
 
    constexpr explicit conjugated_scalar(Reference reference)
        : base_type(reference)
    {
    }
 
    [[nodiscard]] static constexpr auto to_value(Reference reference)
    {
        return conj_if_needed(ReferenceValue(reference));
    }
 
private:
    using my_type   = conjugated_scalar<Reference, ReferenceValue>;
    using base_type = proxy_reference<Reference, ReferenceValue, my_type>;
};
 
} // namespace etl::linalg::detail
 
#endif // TETL_LINALG_CONJUGATED_SCALAR_HPP