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.
Except in the constructors of std::strstreambuf, negative values of std::streamsize are never used.
#include <iostream>
#include <type_traits>
static_assert(std::is_signed_v<std::streamsize>);
int main()
{
std::cout << sizeof(std::streamsize) << '\n';
}
Possible output:
[edit] See also returns number of characters extracted by last unformatted input operationstd::basic_istream<CharT,Traits>) [edit] extracts and discards characters until the given character is found
std::basic_istream<CharT,Traits>) [edit] extracts blocks of characters
std::basic_istream<CharT,Traits>) [edit] inserts blocks of characters
std::basic_ostream<CharT,Traits>) [edit]
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