#include <sstream>
#include <iostream>
using namespace std;

int main()
{
	{
		std::stringstream ss;
		ss << "abcd";
		char buf[1024];
		ss.read(buf, 4);
		std::cout << "EOF: " << std::boolalpha << ss.eof() << std::endl;
	}

	{
		std::stringstream ss;
		ss << "abcd";
		ss.ignore(4);
		std::cout << "EOF: " << std::boolalpha << ss.eof() << std::endl;
	}
}

EOF: false
EOF: true