Code from http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4134.pdf

await.cpp

std::future<void> tcp_reader(int total)
{
    char buf[64 * 1024];
    auto conn = await Tcp::Connect("127.0.0.1", 1337);
    do
        {
            auto bytesRead = await conn.read(buf, sizeof(buf));
            total -= bytesRead;
        }
    while (total > 0);
}

int main() { tcp_reader(1000 * 1000 * 1000).get(); }