tmp/tmp8khsj499/{from.md → to.md}
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#### `ranges::distance` <a id="range.iter.op.distance">[[range.iter.op.distance]]</a>
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``` cpp
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template<input_or_output_iterator I, sentinel_for<I> S>
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constexpr iter_difference_t<I> ranges::distance(I first, S last);
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```
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*Preconditions:* \[`first`, `last`) denotes a range, or \[`last`,
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`first`) denotes a range and `S` and `I` model
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`same_as<S, I> && sized_sentinel_for<S, I>`.
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*Effects:* If `S` and `I` model `sized_sentinel_for<S, I>`, returns
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`(last - first)`; otherwise, returns the number of increments needed to
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get from `first` to `last`.
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``` cpp
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template<range R>
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constexpr range_difference_t<R> ranges::distance(R&& r);
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```
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*Effects:* If `R` models `sized_range`, equivalent to:
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``` cpp
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return static_cast<range_difference_t<R>>(ranges::size(r)); // [range.prim.size]
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```
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Otherwise, equivalent to:
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``` cpp
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return ranges::distance(ranges::begin(r), ranges::end(r)); // [range.access]
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```
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