tmp/tmpd361d5a9/{from.md → to.md}
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#### Member functions <a id="spanbuf.members">[[spanbuf.members]]</a>
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``` cpp
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std::span<charT> span() const noexcept;
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```
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*Returns:* If `ios_base::out` is set in *mode*, returns
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`std::span<charT>(pbase(), pptr())`, otherwise returns *buf*.
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[*Note 1*: In contrast to `basic_stringbuf`, the underlying sequence
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never grows and is not owned. An owning copy can be obtained by
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converting the result to `basic_string<charT>`. — *end note*]
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``` cpp
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void span(std::span<charT> s) noexcept;
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```
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*Effects:* *`buf`*` = s`. Initializes the input and output sequences
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according to *mode*.
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*Ensures:*
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- If `ios_base::out` is set in *mode*,
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`pbase() == s.data() && epptr() == pbase() + s.size()` is `true`;
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- in addition, if `ios_base::ate` is set in *mode*,
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`pptr() == pbase() + s.size()` is `true`,
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- otherwise `pptr() == pbase()` is `true`.
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- If `ios_base::in` is set in *mode*,
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`eback() == s.data() && gptr() == eback() && egptr() == eback() + s.size()`
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is `true`.
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