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POCreate std::stringbuf based on std::vector<char>
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  1. POCreate std::stringbuf based on std::vector<char>
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    copied!<p>I am doing in-memory image conversions between two frameworks (OpenSceneGraph and wxWidgets). Not wanting to care about the underlying classes (<code>osg::Image</code> and <code>wxImage</code>), I use the stream oriented I/O features both APIs provide like so:</p> <p>1) Create an <code>std::stringstream</code></p> <p>2) Write to the stream using OSG's writers</p> <p>3) Read from the stream using wxWigdets readers</p> <p>This works fairly well. Until now I've been using direct access to the stream buffer, but my attention has been recently caught by the "non-contiguous underlying buffer" problem of the <code>std::stringstream</code>. I had been using a kludge to get a <code>const char*</code> ptr to the buffer - but it worked (tested on Windows, Linux and OSX, using MSVC 9 and GCC 4.x), so I never fixed it.</p> <p>Now I understand that this code is a time bomb and I want to get rid of it. This problem has been brought up several times on SO (<a href="https://stackoverflow.com/questions/1877500/c-stl-stringstream-direct-buffer-access">here for instance</a>), but I could not find an answer that could really help me do the simplest thing that could possibly work.</p> <p>I think the most reasonable thing to do is to create my own streambuf using a vector behind the scenes - this would guarantee that the buffer is contiguous. I am aware that this would not a generic solution, but given my constraints:</p> <p>1) the required size is <em>not</em> infinite and actually quite predictable</p> <p>2) my stream really needs to be an <code>std::iostream</code> (I can't use a raw char array) because of the APIs</p> <p>anybody knows how I can either a custom stringbuf using a vector of chars ? Please do not answer "use <code>std::stringstream::str()</code>", since I <em>know</em> we can, but I'm precisely looking for something else (even though you'd say that copying 2-3 MB is so fast that I wouldn't even notice the difference, let's consider I am still interested in custom stringbufs just for the beauty of the exercise).</p>
 

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