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Synchronous reading from IOBuffer
void thread1_func(ostream& os)
{
    sleep(10);
    os << 12;
    sleep(10);
    os << "text";
    sleep(10);
    os << MyObject();
}

void thread2_func(istream& is)
{
    int i = 0;
    std::string str;
    MyObject obj;

    is >> 12;    // waits until 12 is written
    is >> str;   // waits for "text"
    is >> obj;   // waits for MyObject
}


void main()
{
    IOBuffer buf;

    // create two threads:
    thread1_func(ostream(buf));
    thread2_func(istream(buf));

}

void main()
{
    boost::asio::streambuf buf;
    std::ostream os(&buf);
    std::istream is(&buf);
    //...
}