tmp/tmpdxfr6xyj/{from.md → to.md}
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#### Constructors <a id="ispanstream.cons">[[ispanstream.cons]]</a>
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``` cpp
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explicit basic_ispanstream(std::span<charT> s, ios_base::openmode which = ios_base::in);
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```
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*Effects:* Initializes the base class with
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`basic_istream<charT, traits>(addressof(sb))` and `sb` with
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`basic_spanbuf<charT, traits>(s, which | ios_base::in)`
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[[spanbuf.cons]].
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``` cpp
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basic_ispanstream(basic_ispanstream&& rhs);
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```
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*Effects:* Initializes the base class with `std::move(rhs)` and `sb`
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with `std::move(rhs.sb)`. Next,
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`basic_istream<charT, traits>::set_rdbuf(addressof(sb))` is called to
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install the contained `basic_spanbuf`.
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``` cpp
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template<class ROS> explicit basic_ispanstream(ROS&& s)
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```
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*Constraints:* `ROS` models `ranges::borrowed_range`.
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`!convertible_to<ROS, std::span<charT>> && convertible_to<ROS, std::span<charT const>>`
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is `true`.
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*Effects:* Let `sp` be `std::span<const charT>(std::forward<ROS>(s))`.
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Equivalent to
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``` cpp
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basic_ispanstream(std::span<charT>(const_cast<charT*>(sp.data()), sp.size()))
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```
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