std::streamsize

 

C++

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Technical Specifications

 

Input/output library

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basic_streambuf

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ios_base

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istrstream (deprecated in C++98)

ostrstream (deprecated in C++98)

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Synchronized Output

basic_osyncstream (C++20)

Types

streamoff

streamsize

fpos

Error category interface

iostream_category (C++11)

io_errc (C++11)

 

Defined in header <ios>
typedef /*unspecified*/ streamsize;

The type std::streamsize is a signed integral type used to represent the number of characters transferred in an I/O operation or the size of an I/O buffer. It is used as a signed counterpart of std::size_t, similar to the POSIX type ssize_t.

Except in the constructors of std::strstreambuf, negative values of std::streamsize are never used.

See also

gcount	returns number of characters extracted by last unformatted input operation (public member function of std::basic_istream<CharT,Traits>)
ignore	extracts and discards characters until the given character is found (public member function of std::basic_istream<CharT,Traits>)
read	extracts blocks of characters (public member function of std::basic_istream<CharT,Traits>)
write	inserts blocks of characters (public member function of std::basic_ostream<CharT,Traits>)