On Thu, Sep 6, 2012 at 11:17 PM, Szymon Gatner wrote:

You could use filtering_ostream with underlying vector and reserve() on that vector.

Szymon, Thank you that is exactly what I did: #include #include #include <string> std::string Result; Result.reserve(99999); boost::iostreams::filtering_ostream Stream( boost::iostreams::back_inserter(Result)); Stream.write(pBuffer, 99999); // this part is more complicated in my real scenario // use Result... Chris

On Fri, Sep 7, 2012 at 2:09 PM, Szymon Gatner wrote:

May I ask tho: why are you using a stream to write a block of memory to a string? Why not just directly copying it to a vector (or a string)?

These are good questions. The short answer is I am pseudo-profiling... aka profiling by "divine inspiration" rather than actually looking at the results of a profiler... which is often a waste of time but this time seemed to help. My original code wrote many small batches of binary data to std::cout (think hundreds of thousands of calls to std::cout::write). I modified the routine to use boost's filtering_ostream to write many small blocks to a string. Then write that string to stdout with just one call to std::cout::write. This reduced the number of calls to std::cout::write by a factor of 100,000 or so. In my real case, unlike the example I posted here, the data I am writing is not from one contiguous block. Thank you! Chris