Get an istream from a char*

#include <iostream>
#include <istream>
#include <streambuf>
#include <string>

struct membuf : std::streambuf
{
membuf(char* begin, char* end) {
this->setg(begin, begin, end);
}
};

int main()
{
char buffer[] = "I'm a buffer with embedded nulls\0and line\n feeds";

membuf sbuf(buffer, buffer + sizeof(buffer));
std::istream in(&sbuf);
std::string line;
while (std::getline(in, line)) {
std::cout << "line: " << line << "\n";
}
return 0;
}

line: I'm a buffer with embedded nullsand line
line:  feeds