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std::indirectly_readable

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indirectly_readable

(C++20)

indirectly_writable

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(C++20)

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(C++20)

indirect_equivalence_relation

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(C++20)

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(C++20)

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indirectly_swappable

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(C++20)

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indirect_result_t

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(C++20)

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(C++26)

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(C++14)(C++14)

(C++17)(C++20)

(C++17)

(C++17)

Defined in header <iterator>

template< class In >

concept __IndirectlyReadableImpl =
requires(const In in) {
typename std::iter_value_t <In>;
typename std::iter_reference_t <In>;
typename std::iter_rvalue_reference_t <In>;
{ *in } -> std::same_as <std::iter_reference_t <In>>;
{ ranges::iter_move (in) } -> std::same_as <std::iter_rvalue_reference_t <In>>;
} &&
std::common_reference_with <
std::iter_reference_t <In>&&, std::iter_value_t <In>&
> &&
std::common_reference_with <
std::iter_reference_t <In>&&, std::iter_rvalue_reference_t <In>&&
> &&
std::common_reference_with <
std::iter_rvalue_reference_t <In>&&, const std::iter_value_t <In>&

>;

(exposition only*)

template< class In >

concept indirectly_readable =

__IndirectlyReadableImpl<std::remove_cvref_t <In>>;

(since C++20)

The concept indirectly_readable is modeled by types that are readable by applying operator*, such as pointers, smart pointers, and input iterators.

[edit] Semantic requirements

Given a value i of type I, I models indirectly_readable only if all concepts it subsumes are modeled and the expression *i is equality-preserving.

[edit] Equality preservation

Expressions declared in requires expressions of the standard library concepts are required to be equality-preserving (except where stated otherwise).

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