#include <iostream>
#include <string>
#include <algorithm>
#include <locale>
#include <functional>


static inline std::string& ltrim(std::string& s)
{
  s.erase(s.begin(), std::find_if(s.begin(), s.end(), 
                                  [](int c) { return !std::isspace(c); }));
  return s;
}

static inline std::string& rtrim(std::string& s)
{
  s.erase(std::find_if(s.rbegin(), s.rend(), 
                       [](int c) { return !std::isspace(c); }).base(), s.end());
  return s;
}

static inline std::string& trim(std::string& s)
{
  return ltrim(rtrim(s));
}





int main (int argc, char *argv[]) {
  std::string s = "   \n\r\t   Hello \r\t\n\n   World   \n\r\t    ";
  std::cout << "Before: " << s << " len: " << s.length() << std::endl;

  std::string xxx = trim(s);
  std::cout << "After trim: " << xxx << std::endl;

  int a = s.find('\n') != std::string::npos;
  int b = s.find('\r') != std::string::npos;
  std::cout << "a: " << a << ", b: " << b << std::endl;

  s.erase(std::remove_if(s.begin(),
                         s.end(),
                         std::bind(std::isspace<char>, std::placeholders::_1, std::locale::classic())),
          s.end());

  std::cout << "After: " << s << " len: " << s.length() << std::endl;

  std::cout << "" << std::string("\r").length() << std::endl;


  return 0;
}