One of the possibilities is:
somestringstream.str("");
But is it most optimal? Is there any way to preserve stringstream internal buffer, so that following operator<<() calls would not require to reserve memory again?
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3It was discussed here: http://stackoverflow.com/questions/624260/how-to-reuse-an-ostringstream – Johannes Schaub - litb May 07 '09 at 13:26
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I've always done:
s.clear();//clear any bits set
s.str(std::string());
@litb gets into more detail about how to seekp to the start of the stream combined with std::ends you can keep your allocated size.
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1@milan1612: You would still need to clear the bits, and sending a C-style char* will be slower. – Drew Dormann May 18 '09 at 00:14
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3..and [this explains](http://stackoverflow.com/questions/20731/in-c-how-do-you-clear-a-stringstream-variable) why the `s.str(std::string())` variant _could_ be more efficient. – Andreas Spindler Jan 26 '12 at 11:48