Question

Possible Duplicate:
Splitting a string in C++

I have this vector function from one of the answers I got on my question

vector<string> split(const string& s, char delim)
{
  vector<string> elems(2);
  string::size_type pos = s.find(delim);
  elems[0] = s.substr(0, pos);
  elems[1] = s.substr(pos + 1);
  return elems;
}

However, it only accept 2 elements. How do I modify it to accept based on how many delimiter s exist in the string s?

e.g if I have this:

user#password#name#fullname#telephone

sometime the size might differ.

How can I make this function flexible to work no matter how many elements, and able to split like this function above?

Just to further explain my problem:

What i wanna achieve is the capability to split using this vector function, of the same delimiter to N size instead of fixed at size 2.

This function can only split maximum 2 element in a string, more than that result in Segmentation core dump

as previously i only have needs for usage like

user:pass

now i added more attribute so i need to be able to split

user:pass:name:department

which x[2] and x[3] will return respectively name and department

they all will be using same delimiter.

Further Update:

I tried using this function provided by 1 of the answer below

vector<string> split(const string& s, char delim)
{
bool found;
vector<string> elems;
  while(1){
   string::size_type pos = s.find(delim);
   if (found==string::npos)break;
   elems.push_back(s.substr(0, pos));
   s=s.substr(pos + 1);
  }
  return elems;
}

and i get some error

server.cpp: In function ‘std::vector<std::basic_string<char> > split(const string&, char)’:
server.cpp:57:22: error: passing ‘const string {aka const std::basic_string<char>}’ as ‘this’ argument of ‘std::basic_string<_CharT, _Traits, _Alloc>& std::basic_string<_CharT, _Traits, _Alloc>::operator=(const std::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>, std::basic_string<_CharT, _Traits, _Alloc> = std::basic_string<char>]’ discards qualifiers [-fpermissive]

Answer 1

There is one answer to the almost-duplicate that provides a generic split functionality:

std::vector<std::string> split(std::string const& str, std::string const& delimiters = "#") {
  std::vector<std::string> tokens;

  // Skip delimiters at beginning.
  string::size_type lastPos = str.find_first_not_of(delimiters, 0);
  // Find first "non-delimiter".
  string::size_type pos = str.find_first_of(delimiters, lastPos);

  while (string::npos != pos || string::npos != lastPos) {
    // Found a token, add it to the vector.
    tokens.push_back(str.substr(lastPos, pos - lastPos));
    // Skip delimiters.  Note the "not_of"
    lastPos = str.find_first_not_of(delimiters, pos);
    // Find next "non-delimiter"
    pos = str.find_first_of(delimiters, lastPos);
  }
  return tokens;
}

which can be easily wrapped to:

std::vector<std::string> split(std::string const& str, char const delimiter) {
  return split(str,std::string(1,delimiter));
}