std::streamsize
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C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
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Execution control library (C++26)
Input/output library
Print functions (C++23)
Buffers
(C++23)
(C++98/26*)
(C++20)
Streams
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File I/O
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(C++23)
(C++23)
(C++23)
(C++98/26*)
(C++98/26*)
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Synchronized Output
(C++20)
Types
streamsize
Error category interface
(C++11)
(C++11)
Defined in header
<ios>
typedef /*implementation-defined*/ 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.
[edit] Notes
Except in the constructors of std::strstreambuf , negative values of std::streamsize are never used.
[edit] Example
Run this code
#include <iostream> #include <type_traits> static_assert(std::is_signed_v <std::streamsize>); int main() { std::cout << sizeof(std::streamsize) << '\n'; }
Possible output:
8
[edit] See also
returns number of characters extracted by last unformatted input operation
(public member function of
(public member function of
std::basic_istream<CharT,Traits>) [edit]
extracts and discards characters until the given character is found
(public member function of
(public member function of
std::basic_istream<CharT,Traits>) [edit]