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Reusing istringstream

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Does anyone know how to reinitialise an istringstream to the start after it has been ''used''? Example:
  
string text = "some words here";
string word;
istringstream ss(text);
ss >> word; // word should now contain "some"

ss >> word; // word should now contain "words"

  
At this point, if I do "ss >> word;" again, word should end up containing "here". But, imagine I wish to start again, and have the next word to be extracted as "some". I''d have thought that: ss.str(text); Would do the job, but apparently not. It appears to fail to return anything at that point. Could anyone point out what I''m doing wrong?

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