/* The following code example is taken from the book

* "The C++ Standard Library - A Tutorial and Reference, 2nd Edition"

* by Nicolai M. Josuttis, Addison-Wesley, 2012

*

* (C) Copyright Nicolai M. Josuttis 2012.

* Permission to copy, use, modify, sell and distribute this software

* is granted provided this copyright notice appears in all copies.

* This software is provided "as is" without express or implied

* warranty, and with no claim as to its suitability for any purpose.

*/

#include <string>

#include <iostream>

#include <algorithm>

#include <iterator>

#include <locale>

using namespace std;

int main()

{

string input;

// don't skip leading whitespaces

cin.unsetf (ios::skipws);

// read all characters while compressing whitespaces

const locale& loc(cin.getloc()); // locale

unique_copy(istream_iterator<char>(cin), // beginning of source

istream_iterator<char>(), // end of source

back_inserter(input), // destination

[=] (char c1, char c2) { // criterion for adj. duplicates

return isspace(c1,loc) && isspace(c2,loc);

});

// process input

// - here: write it to the standard output

cout << input;

}