std::basic_spanbuf<CharT,Traits>::span - cppreference.com
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std::basic_spanbuf<CharT,Traits>::span

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std::basic_spanbuf
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std::span<CharT> span() const noexcept;
(1) (since C++23)
void span( std::span<CharT> s ) noexcept;
(2) (since C++23)
1) Gets a span referencing the written area if std::ios_base::out is set in the open mode, or a span referencing the underlying buffer otherwise.
2) Makes the basic_spanbuf perform I/O on the buffer referenced by s. Sets pointers to get area, put area, or both.
Set bits in open mode
(affecting pointers to get area)
Return value after setting
std::basic_streambuf::eback std::basic_streambuf::gptr std::basic_streambuf::egptr
std::ios_base::in s.data() s.data() s.data() + s.size()
Set bits in open mode
(affecting pointers to put area)
Return value after setting
std::basic_streambuf::pbase std::basic_streambuf::pptr std::basic_streambuf::epptr
std::ios_base::out && !std::ios_base::ate s.data() s.data() s.data() + s.size()
std::ios_base::out && std::ios_base::ate s.data() s.data() + s.size() s.data() + s.size()

Parameters

s - a std::span that references the user-provided buffer

Return value

1) std::span<CharT>(pbase(), pptr()) if std::ios_base::out is set in the open mode, or a std::span<CharT> that references the whole underlying buffer otherwise.
2) (none)

Example

See also