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

std::streamsize gcount() const;

Returns the number of characters extracted by the last unformatted input operation, or the maximum representable value of std::streamsize if the number is not representable.

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

• move constructor
• swap()
• get()
• getline()
• ignore()
• read()
• readsome()
• operator>>(basic_streambuf*)

The following functions set gcount() to zero:

• constructor
• putback()
• unget()
• peek()

Parameters

(none).

Return value

The number of characters extracted by the last unformatted input operation, or the maximum representable value of std::streamsize if the number is not representable.

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();
}

Characters extracted: 11

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.