std::basic_ospanstream<CharT,Traits>::basic_ospanstream
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< cpp | io | basic ospanstream
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explicit basic_ospanstream( std::span <CharT> s, std::ios_base::openmode mode =
std::ios_base::out );
(1)
(since C++23)
std::ios_base::out );
basic_ospanstream( basic_ospanstream&& rhs );
(2)
(since C++23)
basic_ospanstream( const basic_ospanstream& ) = delete;
(3)
(since C++23)
Constructs a new basic_ospanstream.
1) Uses the storage referenced by s as initial underlying buffer of the wrapped std::basic_spanbuf device. The wrapped std::basic_spanbuf object is constructed as basic_spanbuf<Char, Traits>(s, mode | std::ios_base::out ).
2) Move constructor. Move constructs the std::basic_ostream base subobject and the wrapped std::basic_spanbuf from those of rhs, and then calls set_rdbuf with the address of the wrapped std::basic_spanbuf in *this to install it.
3) Copy constructor is deleted.
basic_ospanstream is not copyable.Contents
[edit] Parameters
s
-
std::span referencing the storage to be use as initial underlying buffer of stream
mode
-
specifies stream open mode. Following constants and bit-wise OR between them may be used:
Constant
Explanation
app
seek to the end of stream before each write
binary
open in binary mode
in
open for reading
out
open for writing
trunc
discard the contents of the stream when opening
ate
seek to the end of stream immediately after open
noreplace (C++23)
open in exclusive mode
other
-
another
basic_ospanstream to be moved from
[edit] Exceptions
May throw implementation-defined exceptions.
[edit] Example
Run this code
#include <array> #include <iostream> #include <spanstream> int main() { std::array <char, 10> buffer; std::ospanstream os(buffer); os << "i=" << 1 << " j=" << 2 << '\n' << std::ends ; std::cout << buffer.data(); }
Output:
i=1 j=2
[edit] See also
constructs a
(public member function of
basic_spanbuf object (public member function of
std::basic_spanbuf<CharT,Traits>) [edit]