Writing a C++ Split function

Sidoh · September 26, 2003, 03:12 PM

Does anyone know (or have) a function writen (or in their posetion) in C++ similar to the visual basic Split() function?

Zakath · September 26, 2003, 03:26 PM

What does Split do?

iago · September 26, 2003, 03:33 PM

No, it would be pretty difficult to write something like that in c++. I would recommend looking into the "foreach" command in perl, or this clever use of strtok:

Code Select

   for(char *p = strtok(Packet, " "); p; p = strtok(NULL, " ")) 
{
// ...
}

In that, it will run that loop once for each token in the string, much like perl's foreach.

Warning: This will modify the original string.

K · September 26, 2003, 03:39 PM

I wrote this just for you.

Shouldn't be hard to modify it to take multiple delimeters -- look at basic_string::find_first_of() if you want to do that.

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#include <string>
#include <vector>

std::vector<std::string> SplitStr(const std::string& text, const std::string& delimeter)
{
   size_t pos = 0;
   size_t oldpos = 0;
   size_t delimlen = delimeter.length();

   std::vector<std::string> result;
   while(pos != std::string::npos)
   {
      pos = text.find(delimeter, oldpos);
      result.push_back(text.substr(oldpos, pos - oldpos));
      oldpos = pos + delimlen;
   }

   return result;
   
}

Edit: come on iago, character arrays and strok in c++?

iago · September 26, 2003, 03:41 PM

Mine is muchm much more efficient, which tends to be a major factor in my code! :-P

K · September 26, 2003, 03:52 PM

Or if you only want to split on whitespace (end of line, space, tab, etc) you could use a stringstream:

Code Select


#include <string>
#include <sstream>
#include <vector>

vector<string> SplitStr(const string& text)
{
   stringstream stream;
   vector<string> result;
   string tmp;

   stream << text;
   while(!stream.eof())
   {
      stream >> tmp;
      result.push_back(tmp);
   }
   return result;
   
}

iago · September 26, 2003, 05:05 PM

That's even more eew!

Sidoh · September 26, 2003, 06:26 PM

lol iago

stupid c++, can't make a split() function, lazy bastards... i actually like C++ better then vb, "funner" to code..

hey iago, do you use strtok to split bnet returns? or do you have your own writen function?

iago · September 26, 2003, 06:45 PM

To split bnet returns? What are you talking about?

I use a buffer class I wrote to process b.net packets, if that's what you mean. It can be found at http://iago.valhallalegends.com .

Maddox · September 26, 2003, 10:04 PM

Quote from: Sidoh on September 26, 2003, 06:26 PM
lol iago

stupid c++, can't make a split() function, lazy bastards... i actually like C++ better then vb, "funner" to code..

hey iago, do you use strtok to split bnet returns? or do you have your own writen function?

I think you are refering to extracting strings from packet data, but why would you use strtok() to do that? The strings are null terminated.

Arta · September 26, 2003, 10:07 PM

You're still thinking in VB. Stop it. Think in C++. Don't go "This is how I'd do X in VB, what's the equivalent in C++?". Do something more like: "What facility does C++ provide that will allow me to do X?". Your code will end up being much more efficient if you change your mindset a bit.

Writing a C++ Split function

Sidoh

K

K

Sidoh