std::indirect_strict_weak_order

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Iterator library

Iterator concepts

indirectly_readable (C++20)
indirectly_writable (C++20)
weakly_incrementable (C++20)
incrementable (C++20)
is-integer-like is-signed-integer-like (C++20)(C++20)

sentinel_for (C++20)
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input_iterator_tagoutput_iterator_tagforward_iterator_tagbidirectional_iterator_tagrandom_access_iterator_tagcontiguous_iterator_tag

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iter_value_titer_difference_titer_reference_titer_const_reference_titer_rvalue_reference_titer_common_reference_t

(C++20)(C++20)(C++20)(C++23)(C++20)(C++20)

iterator (deprecated in C++17)
iterator_traits
incrementable_traits (C++20)
indirectly_readable_traits (C++20)

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Indirect callable concepts

indirectly_unary_invocableindirectly_regular_unary_invocable

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

indirect_unary_predicate (C++20)
indirect_binary_predicate (C++20)

indirect_equivalence_relation (C++20)
indirect_strict_weak_order (C++20)

Common algorithm requirements

indirectly_movable (C++20)
indirectly_movable_storable (C++20)
indirectly_copyable (C++20)

indirectly_copyable_storable (C++20)
indirectly_swappable (C++20)
indirectly_comparable (C++20)

permutable (C++20)
mergeable (C++20)
sortable (C++20)

(C++20)

(C++20)

(C++26)

reverse_iterator
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empty (C++17)
data (C++17)

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Defined in header`<iterator>`
template<class F,class I1,class I2= I1> concept indirect_strict_weak_order= std::indirectly_readable<I1>&& std::indirectly_readable<I2>&& std::copy_constructible<F>&& std::strict_weak_order <F&,/indirect-value-t/<I1>,/indirect-value-t/<I2>>&& std::strict_weak_order <F&,/indirect-value-t/<I1>,std::iter_reference_t<I2>>&& std::strict_weak_order <F&,std::iter_reference_t<I1>,/indirect-value-t/<I2>>&& std::strict_weak_order <F&,std::iter_reference_t<I1>,std::iter_reference_t<I2>>;		(since C++20)

The conceptindirect_strict_weak_order specifies requirements for algorithms that call strict weak orders as their arguments. The key difference between this concept andstd::strict_weak_order is that it is applied to the types thatI1 andI2 references, rather thanI1 andI2 themselves.

[edit]Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
P2609R3	C++20	some requirements were defined in terms of std::iter_value_t<I>& which mishandled projections resulting in incompatibility with strict weak orderF&	defined in terms of /indirect-value-t/<I> to correctly handle such projections
P2997R1	C++20	`indirect_strict_weak_order` requiredF& to satisfy `strict_weak_order` withstd::iter_common_reference_t<I>	does not require

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std::indirect_strict_weak_order

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