Tokenizing strings

This is a discussion on Tokenizing strings within the C++ Programming forums, part of the General Programming Boards category; Is there a class or function in c++ that is similar to the StringTokenizer class or the split() method?...

  1. #1
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    Tokenizing strings

    Is there a class or function in c++ that is similar to the StringTokenizer class or the split() method?

  2. #2
    Captain Crash brewbuck's Avatar
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    How about:

    Code:
    std::vector< std::string > Split( const std::string &string, const std::string &delim = " " )
    {
    	std::vector< std::string > result;
    	std::string substr;
    	for( unsigned int n = 0; n < string.size(); ++n )
    	{
    		if( delim.find_first_of( string[ n ] ) == std::string::npos )
    			substr.push_back( string[ n ] );
    		else if( substr.size() > 0 )
    		{
    			result.push_back( substr );
    			substr.clear();
    		}
    	}
    	if( substr.size() > 0 )
    		result.push_back( substr );
    	return result;
    }
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

  3. #3
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    Where can I find functions like this? I normally look at Strings library - C++ Reference but more often than not a function I need isn't listed and I have to ask on a forum. Also, are there wrapper classes like in Java? Something I could use to say like

    bool Character.isUpperCase(char ch)
    bool Character.isDigit(char ch)
    int Integer.parseInt(String s)

  4. #4
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    Btw, I look at the whole reference. I just had the string library brought up atm.

  5. #5
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    string is a wrapper

    Code:
    bool isUpperCase(char ch)
    {
      return ch >= 'A' &&  ch <= 'Z';
    }
    
    bool isDigit(char ch)
    {
      return ch >= '0' && ch <= '9';
    }
    
    int Integer.parseInt(String s) // you can use _atoi for this

  6. #6
    The larch
    Join Date
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    See isupper, isdigit and boost::lexical_cast. For the latter you can also use stringstream and things like sscanf if you choose to go a more C way.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  7. #7
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    this is the code that I use for tokenizing strings:

    Code:
    void TokenizeString(const std::string& str, char delim, std::vector<std::string>& v_string)
    {
      std::stringstream ss(str);
      std::string token;
      v_string.clear();
      while (std::getline(ss, token, delim)
      {
        v_string.push_back(token);
      }
    }
    but it assumes only 1 delimiter, and as such, may not suit your needs.

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