ATL / WTL / STL

#include <string>
#include <iostream>

std::string& trim_back (std::string& str)
{
 using namespace std; 
 while (str.size()) {
  if (isspace (str[str.size()-1])) {
   str.erase(str.size()-1);
  } else {
   break;
  }
 }
 return str;
}


int main()
{
 using namespace std;

 string test ("2003     "),
  whitespaceOnly (" \n\t"),
  empty;

 cout  << '|' << trim_back(test) << '|' << endl;
 cout  << '|' << trim_back(whitespaceOnly) << '|' << endl;
 cout  << '|' << trim_back(empty) << '|' << endl;

 return 0;
}

#include <boost/algorithm/string.hpp>
...
std::string str = "Hello  ";
boost::trim(str);

inline string trim_right(const string& source, const string& t = " ")
{
	string str = source;
	return str.erase(source.find_last_not_of(t) + 1);
}

inline string trim_left(const string& source, const string& t = " ")
{
	string str = source;
	return str.erase(0, source.find_first_not_of(t));
}

inline string trim(const string& source, const string& t = " ")
{
	return trim_left(trim_right(source, t), t);
}

inline string& trim(string& s, const string& t)
{
	string::size_type st1, st2;
	st1 = s.find_first_not_of(t);
	
	if (st1 != string::npos)
	{
		st2 = s.find_last_not_of(t) + 1;
		s = s.substr(st1, st2 - st1);
	}
	else
	{
		s.clear();
	}

	return s;
}

void fn(int* ptr)
{
	(*ptr)++;
}

int _tmain(int argc, _TCHAR* argv[])
{
	std::auto_ptr<int> a(new int(11));	
	fn(a.get());
	cout << "a = " << *a << endl;//prints 12
	return 0;
}

void fn(int*& ptr)
{
}

int _tmain(int argc, _TCHAR* argv[])
{
	std::auto_ptr<int> a(new int(11));	
	int* tmp;
	fn(tmp = a.get());	
	return 0;
}