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  1. #include <iostream>
  2. #include <string>
  3. #include <algorithm>
  4. #include <locale>
  5. #include <cassert>
  6.  
  7.  
  8. int main()
  9. {
  10.     std::string test("hi   how are you"),reference("ih   woh era uoy");
  11.  
  12.     std::locale const& loc=std::locale();
  13.  
  14.     auto pos=test.begin();
  15.  
  16.     auto next_token=
  17.      [&](char c) {
  18.            return std::isspace(c,loc)!=std::isspace(*pos,loc);
  19.      };
  20.  
  21.     for (auto it=std::find_if(pos,test.end(),next_token);
  22.               it!=test.end();
  23.               it=std::find_if(pos,test.end(),next_token)) {
  24.                if (!std::isspace(*pos,loc))
  25.                     std::reverse(pos,it);
  26.                pos=it;
  27.     }
  28.     std::reverse(pos,test.end());
  29.  
  30.     std::cout<<test<<std::endl;
  31.  
  32.     assert(test==reference);
  33. }
Success #stdin #stdout 0s 2988KB
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Standard input is empty
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ih   woh era uoy
https://ideone.com/hs9NZ7
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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