29 Numerics library [numerics]

29.9 Basic linear algebra algorithms [linalg]

29.9.9 Conjugated in-place transformation [linalg.conj]

29.9.9.2 Class template conjugated_accessor [linalg.conj.conjugatedaccessor]

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The class template conjugated_accessor is an mdspan accessor policy which upon access produces conjugate elements.
It is part of the implementation of conjugated ([linalg.conj.conjugated]).
namespace std::linalg { template<class NestedAccessor> class conjugated_accessor { public: using element_type = add_const_t<decltype(conj-if-needed(declval<NestedAccessor::element_type>()))>; using reference = remove_const_t<element_type>; using data_handle_type = typename NestedAccessor::data_handle_type; using offset_policy = conjugated_accessor<NestedAccessor::offset_policy>; constexpr conjugated_accessor() = default; template<class OtherNestedAccessor> explicit(!is_convertible_v<OtherNestedAccessor, NestedAccessor>>) constexpr conjugated_accessor(const conjugated_accessor<OtherNestedAccessor>& other); constexpr reference access(data_handle_type p, size_t i) const; constexpr typename offset_policy::data_handle_type offset(data_handle_type p, size_t i) const; constexpr const Accessor& nested_accessor() const noexcept { return nested-accessor_; } private: NestedAccessor nested-accessor_{}; // exposition only }; }
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Mandates:
  • (2.1)
    element_type is valid and denotes a type,
  • (2.2)
    is_copy_constructible_v<reference> is true,
  • (2.3)
    is_reference_v<element_type> is false, and
  • (2.4)
    NestedAccessor meets the accessor policy requirements ([mdspan.accessor.reqmts]).
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constexpr conjugated_accessor(const NestedAccessor& acc);
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Effects: Direct-non-list-initializes nested-accessor_ with acc.
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template<class OtherNestedAccessor> explicit(!is_convertible_v<OtherNestedAccessor, NestedAccessor>>) constexpr conjugated_accessor(const conjugated_accessor<OtherNestedAccessor>& other);
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Constraints: is_constructible_v<NestedAccessor, const OtherNestedAccessor&> is true.
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Effects: Direct-non-list-initializes nested-accessor_ with other.nested_accessor().
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constexpr reference access(data_handle_type p, size_t i) const;
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Returns: conj-if-needed(NestedAccessor​::​element_type(nested-accessor_.access(p, i)))
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constexpr typename offset_policy::data_handle_type offset(data_handle_type p, size_t i) const;
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Returns: nested-accessor_.offset(p, i)