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Re: Help with reading formatted input from an istream

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On 01/27/12 03:12 PM, Ttodir wrote:
> Consider the following program:
>
> #include<iostream>
> #include<iterator>
> #include<string>
> #include<set>
> #include<algorithm>
>
> using namespace std;
>
> typedef string T; // to simplify, always consider T as string
>
> template<typename input_iterator>
> void do_something(const input_iterator&  first, const input_iterator&
> last) {
>      const ostream_iterator<T>  os(cout, "\n");
>      const set<T>  words(first, last);
>      copy(words.begin(), words.end(), os);
> }
>
> int main(int argc, char** argv) {
>      const istream_iterator<T>  is(cin), eof;
>      do_something(is, eof);
>      return 0;
> }
>
> The program extracts all the words from an istream (cin) and does
> something with them. Each word is seperated by a white space by
> default. The logic behind the formatted extraction is inside the
> istream_iterator.
>
> What I need to do now is to pass to do_something() two iterators so
> that the extracted words will be separated by a punctuation character
> instead of a white space (white spaces will be considered as "normal"
> characters). How would you do that in a "clean C++ way" (that is, with
> the minimum effort)?

Derive your own input iterator class from std::input_iterator.

-- 
Ian Collins

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Help with reading formatted input from an istream Ttodir <sanmrtn96@gmail.com> - 2012-01-26 18:12 -0800
  Re: Help with reading formatted input from an istream Ian Collins <ian-news@hotmail.com> - 2012-01-27 20:21 +1300
  Re: Help with reading formatted input from an istream Leigh Johnston <leigh@i42.co.uk> - 2012-01-27 12:47 +0000
    Re: Help with reading formatted input from an istream Ttodir <sanmrtn96@gmail.com> - 2012-01-28 11:02 -0800

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