cppdraft_translate/cppdraft/linalg/conj/conjugatedaccessor.md

[linalg.conj.conjugatedaccessor]

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 ofconjugated ([linalg.conj.conjugated]).

namespace std::linalg {templateclass conjugated_accessor {public:using element_type = add_const_t<decltype(conj-if-needed(declvalNestedAccessor::element_type()))>; using reference = remove_const_t<element_type>; using data_handle_type = typename NestedAccessor::data_handle_type; using offset_policy = conjugated_accessorNestedAccessor::offset_policy; constexpr conjugated_accessor() = default; templateexplicit(!is_convertible_v<OtherNestedAccessor, NestedAccessor>>)constexpr conjugated_accessor(const conjugated_accessor& 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 NestedAccessor& 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 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-initializesnested-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)