Re: [Boost-users] Iostreams: how can I control my (ostream) filter?

Subject: Re: [Boost-users] Iostreams: how can I control my (ostream) filter?
From: Sylro (syrmonsieur_at_[hidden])
Date: 2014-11-16 15:06:55

Hi Akim.

I see what you're trying to do : sync up to the filter, but not beyond,
would be a simple solution.
However boost::iostreams::flush() will always flush everything, up to the
final device.

For the demonstration, if you use this dummy_sink :

class dummy_sink
{
public:
    typedef char char_type;
    struct category : public boost::iostreams::sink_tag, public
boost::iostreams::flushable_tag {};

    std::streamsize write(const char* s, std::streamsize n)
    {
        std::cout << "{" << std::string(s, s + n) << "}";
        return n;
    }

    bool flush()
    {
        std::cout << " FLUSH ";
        std::cout.flush();
        return true;
    }
};

With this example :
    {
        bos_ << " [label = \"";
        enable_();
        bos_ << "bla\\abla" << 1 << 2 << 3 << "blabla";
        disable_();
        bos_ << "\", shape = box"; 
    }

Then the output looks like:
    { [label = "}
    FLUSH
    {bla\\abla123blabla}
    FLUSH
    {", shape = box}
    FLUSH
    FLUSH
    FLUSH
    FLUSH
    FLUSH
    FLUSH
    FLUSH

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