std::streamsize
From cppreference.com
C++
Input/output library
| I/O manipulators | ||||
| Print functions (C++23) | ||||
| C-style I/O | ||||
| Buffers | ||||
(C++23) | ||||
(C++98/26*) | ||||
(C++20) | ||||
| Streams | ||||
| Abstractions | ||||
| File I/O | ||||
| String I/O | ||||
| Array I/O | ||||
(C++23) | ||||
(C++23) | ||||
(C++23) | ||||
(C++98/26*) | ||||
(C++98/26*) | ||||
(C++98/26*) | ||||
| Synchronized Output | ||||
(C++20) | ||||
| Types | ||||
streamsize | ||||
| Error category interface | ||||
(C++11) | ||||
(C++11) |
| Defined in header <ios>
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| typedef /*implementation-defined*/ streamsize; |
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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 std::basic_istream<CharT,Traits>) [edit]
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| extracts and discards characters until the given character is found (public member function of std::basic_istream<CharT,Traits>) [edit]
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| extracts blocks of characters (public member function of std::basic_istream<CharT,Traits>) [edit]
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| inserts blocks of characters (public member function of std::basic_ostream<CharT,Traits>) [edit]
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