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From: Ian Collins <ian-news@hotmail.com>
Newsgroups: comp.lang.c++
Subject: Re: Best way to write the vector content to a file.
Date: Tue, 20 Sep 2011 15:12:19 +1200
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On 09/20/11 03:05 PM, sravanreddy001 wrote:
> 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;
> 	}

Where do you do the write?

> 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.

You will probably be I/O limited, so optimising your code won't make any 
significant difference.

-- 
Ian Collins