std::basic_istream<CharT,Traits>::gcount

std::streamsize gcount() const;

Returns the number of characters extracted by the last unformatted input operation.

The following member functions of basic_istream change the value of subsequent gcount() calls:

The following functions set gcount() to zero:

Parameters

(none).

Return value

The number of characters extracted by the last unformatted input operation.

Example

#include <iostream>
#include <sstream>
 
int main()
{
    char x[20];
    std::istringstream stream("Hello World");
 
    stream.read(x, sizeof x);
    std::cout << "Characters extracted: " << stream.gcount();
}

Output:

Characters extracted: 11

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/io/basic_istream/gcount