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

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

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Strings library

Containers library

Iterators library

Ranges library (C++20)

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Numerics library

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Technical specifications

Symbols index

External libraries

 

Input/output library

I/O manipulators

Print functions (C++23)

C-style I/O

Buffers

basic_streambuf

basic_filebuf

basic_stringbuf

basic_spanbuf (C++23)

strstreambuf (deprecated in C++98)

basic_syncbuf (C++20)

Streams

Abstractions

ios_base

basic_ios

basic_istream

basic_ostream

basic_iostream

File I/O

basic_ifstream

basic_ofstream

basic_fstream

String I/O

basic_istringstream

basic_ostringstream

basic_stringstream

Array I/O

basic_ispanstream (C++23)

basic_ospanstream (C++23)

basic_spanstream (C++23)

istrstream (deprecated in C++98)

ostrstream (deprecated in C++98)

strstream (deprecated in C++98)

Synchronized Output

basic_osyncstream (C++20)

Types

streamoff

streamsize

fpos

Error category interface

iostream_category (C++11)

io_errc (C++11)

 

std::basic_ispanstream

Member functions

basic_ispanstream::basic_ispanstream (C++23)

basic_ispanstream::operator= (C++23)

basic_ispanstream::swap (C++23)

basic_ispanstream::rdbuf (C++23)

Underlying buffer operations

basic_ispanstream::span (C++23)

Non-member functions

swap(std::basic_ipanstream) (C++23)

 

explicit basic_ispanstream( std::span<CharT> s, std::ios_base::openmode mode =                                 std::ios_base::in );	(1)	(since C++23)
template< class ROS > explicit basic_ispanstream( ROS&& r );	(2)	(since C++23)
basic_ispanstream( basic_ispanstream&& rhs );	(3)	(since C++23)
basic_ispanstream( const basic_ispanstream& ) = delete;	(4)	(since C++23)

Constructs a new basic_ispanstream.

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::in).

2) Uses the storage referenced by r after converted to std::span<const CharT> as initial underlying buffer of the wrapped std::basic_spanbuf device. The wrapped std::basic_spanbuf object is opened in mode std::ios_base::in. 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.

3) Move constructor. Move constructs the std::basic_istream 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.

4) Copy constructor is deleted. basic_ispanstream is not copyable.

Parameters

s	-	std::span referencing the storage to be use as initial underlying buffer of stream
r	-	borrowed_range 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_ispanstream to be moved from

Exceptions

May throw implementation-defined exceptions.

See also

(constructor) (C++23)

constructs a basic_spanbuf object (public member function of std::basic_spanbuf<CharT,Traits>)