tmp/tmp6hb0l9m6/{from.md → to.md}
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### Counted view <a id="range.counted">[[range.counted]]</a>
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A counted view presents a `view` of the elements of the counted range
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[[iterator.requirements.general]] `i`+\[0, `n`) for an iterator `i` and
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non-negative integer `n`.
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The name `views::counted` denotes a customization point object
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[[customization.point.object]]. Let `E` and `F` be expressions, let `T`
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be `decay_t<decltype((E))>`, and let `D` be `iter_difference_t<T>`. If
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`decltype((F))` does not model `convertible_to<D>`,
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`views::counted(E, F)` is ill-formed.
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[*Note 1*: This case can result in substitution failure when
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`views::counted(E, F)` appears in the immediate context of a template
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instantiation. — *end note*]
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Otherwise, `views::counted(E, F)` is expression-equivalent to:
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- If `T` models `contiguous_iterator`, then
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`span{to_address(E), static_cast<D>(F)}`.
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- Otherwise, if `T` models `random_access_iterator`, then
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`subrange{E, E + static_cast<D>(F)}`, except that `E` is evaluated
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only once.
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- Otherwise, `subrange{counted_iterator{E, F}, default_sentinel}`.
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