C / C++ / MFC

std::string mid(const std::string& str,std::string::size_type n,std::string::size_type m)
// extract chars from the n-th position up to the (m-1)-th, indexes are 0-based
{
  std::string::size_type count=m<=str.size()?m-n:std::string::npos;
  return str.substr(n,count);
}
 
std::string left(const std::string& str,std::string::size_type n)
// extracts n first leftmost chars
{
  std::string::size_type count=n<=str.size()?n:str.size();
  return str.substr(0,count);
}
 
std::string right(const std::string& str,std::string::size_type n)
// extracts n first rightmost chars
{
  std::string::size_type count=n<=str.size()?n:str.size();
  return str.substr(str.size()-count,count);
}

CClass m_Class;

template<class T>
class CClass {
};

CClass<sometype> m_Class;