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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/io/basic_istream/gcount.html below:

std::basic_istream<CharT,Traits>::gcount - cppreference.com

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()

(none)

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.

#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:

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