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Best way to write the vector content to a file.

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Hi,

Can anyone give the best way (faster) to write the vector contents to a file?

Is there a better way to do it than below method?

        for(unsigned i=0;i<terms.size();i++){
		sprintf(temp,"%d %s\n",i,terms[i].c_str());
 		ids_n_terms = ids_n_terms + temp;
	}

Is the string addition a very expensive operation? (will a new memory allocation takes place)

there are around 5,00,000 (strings) in the vector, and these have to stored in 
<id term> format.

Thanks,
Sravan.

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Best way to write the vector content to a file. sravanreddy001 <sravanreddy001@gmail.com> - 2011-09-19 20:05 -0700
  Re: Best way to write the vector content to a file. Ian Collins <ian-news@hotmail.com> - 2011-09-20 15:12 +1200
  Re: Best way to write the vector content to a file. sravanreddy001 <sravanreddy001@gmail.com> - 2011-09-19 20:28 -0700
    Re: Best way to write the vector content to a file. Ian Collins <ian-news@hotmail.com> - 2011-09-20 15:37 +1200
      Re: Best way to write the vector content to a file. sravanreddy001 <sravanreddy001@gmail.com> - 2011-09-19 20:50 -0700
        Re: Best way to write the vector content to a file. Ian Collins <ian-news@hotmail.com> - 2011-09-20 16:03 +1200
      Re: Best way to write the vector content to a file. sravanreddy001 <sravanreddy001@gmail.com> - 2011-09-19 20:47 -0700
        Re: Best way to write the vector content to a file. Ian Collins <ian-news@hotmail.com> - 2011-09-20 16:09 +1200
    Re: Best way to write the vector content to a file. sravanreddy001 <sravanreddy001@gmail.com> - 2011-09-19 20:29 -0700
  Re: Best way to write the vector content to a file. Juha Nieminen <nospam@thanks.invalid> - 2011-09-20 06:44 +0000
  Re: Best way to write the vector content to a file. Goran <goran.pusic@gmail.com> - 2011-09-20 00:37 -0700
    Re: Best way to write the vector content to a file. Ian Collins <ian-news@hotmail.com> - 2011-09-20 19:45 +1200
      Re: Best way to write the vector content to a file. Goran <goran.pusic@gmail.com> - 2011-09-20 02:01 -0700
  Re: Best way to write the vector content to a file. Rui Maciel <rui.maciel@gmail.com> - 2011-09-20 10:56 +0100
  Re: Best way to write the vector content to a file. Fulvio Esposito <esposito.fulvio@gmail.com> - 2011-09-20 04:03 -0700
  Re: Best way to write the vector content to a file. sravanreddy001 <sravanreddy001@gmail.com> - 2011-09-20 05:00 -0700
    Re: Best way to write the vector content to a file. Goran <goran.pusic@gmail.com> - 2011-09-20 06:55 -0700
    Re: Best way to write the vector content to a file. Paavo Helde <myfirstname@osa.pri.ee> - 2011-09-20 13:39 -0500
  Re: Best way to write the vector content to a file. sravanreddy001 <sravanreddy001@gmail.com> - 2011-09-20 17:50 -0700

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