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std::basic_ispanstream<CharT,Traits>::span

std::span<const CharT> span() const noexcept;
 (1) (since C++23) 
void span( std::span<CharT> s ) noexcept;
 (2) (since C++23) 
template< class ROS >
void span( ROS&& r ) noexcept;
 (3) (since C++23)
1) Gets a span referencing the written area if std::ios_base::out is set in the open mode of the wrapped std::basic_spanbuf, or a span referencing the underlying buffer otherwise.
2) Makes the wrapped std::basic_spanbuf perform I/O on the buffer referenced by s.
3) Same as (2), except that s is obtained as if by
std::span<const CharT> cs{std::forward<ROS>(r)};
std::span<CharT> s{const_cast<CharT*>(cs.data()), cs.size()};
. This overload participates in overload resolution only if ROS models borrowed_range, std::convertible_to<ROS, std::span<CharT>> is false, and std::convertible_to<ROS, std::span<const CharT>> is true.

Parameters

s - std::span referencing the storage to be use as the new underlying buffer of stream
r - borrowed_range to be use as the new underlying buffer of stream

Return value

1) A std::span referencing the underlying buffer or written area, depending on the open mode of the wrapped std::basic_spanbuf.
2-3) (none)

Example

See also

(C++23)
 obtains or initializes an underlying buffer according to mode
(public member function of std::basic_spanbuf<CharT,Traits>)

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