tmp/tmps8c6vsft/{from.md → to.md}
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#### Constructors and conversions <a id="counted.iter.const">[[counted.iter.const]]</a>
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``` cpp
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constexpr counted_iterator(I i, iter_difference_t<I> n);
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```
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*Preconditions:* `n >= 0`.
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*Effects:* Initializes `current` with `std::move(i)` and `length` with
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`n`.
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``` cpp
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template<class I2>
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requires convertible_to<const I2&, I>
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constexpr counted_iterator(const counted_iterator<I2>& x);
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```
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*Effects:* Initializes `current` with `x.current` and `length` with
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`x.length`.
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``` cpp
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template<class I2>
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requires assignable_from<I&, const I2&>
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constexpr counted_iterator& operator=(const counted_iterator<I2>& x);
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```
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*Effects:* Assigns `x.current` to `current` and `x.length` to `length`.
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*Returns:* `*this`.
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