tmp/tmpi2mbmnon/{from.md → to.md}
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#### Concept <a id="iterator.concept.readable">[[iterator.concept.readable]]</a>
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Types that are indirectly readable by applying `operator*` model the
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`indirectly_readable` concept, including pointers, smart pointers, and
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iterators.
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``` cpp
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template<class In>
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concept indirectly-readable-impl =
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requires(const In in) {
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typename iter_value_t<In>;
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typename iter_reference_t<In>;
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typename iter_rvalue_reference_t<In>;
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{ *in } -> same_as<iter_reference_t<In>>;
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{ ranges::iter_move(in) } -> same_as<iter_rvalue_reference_t<In>>;
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} &&
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common_reference_with<iter_reference_t<In>&&, iter_value_t<In>&> &&
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common_reference_with<iter_reference_t<In>&&, iter_rvalue_reference_t<In>&&> &&
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common_reference_with<iter_rvalue_reference_t<In>&&, const iter_value_t<In>&>;
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```
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``` cpp
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template<class In>
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concept indirectly_readable =
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indirectly-readable-impl<remove_cvref_t<In>>;
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```
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Given a value `i` of type `I`, `I` models `indirectly_readable` only if
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the expression `*i` is equality-preserving.
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[*Note 1*: The expression `*i` is indirectly required to be valid via
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the exposition-only `dereferenceable` concept
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[[iterator.synopsis]]. — *end note*]
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