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Full Discussion: passing object to function, columns class
Top Forums Programming passing object to function, columns class Post 302513479 by Corona688 on Wednesday 13th of April 2011 10:29:44 AM
Old 04-13-2011
Quote:
Originally Posted by LMHmedchem
I have made some progress, I will deal with the issue of using string or stringstream in a little bit. Can a string be parsed by a delimiter using the same method I was using for stringstream, or do I have to do something different?
You have to do something different, perhaps something like this:
Code:
# from http://stackoverflow.com/questions/289347/using-strtok-with-a-string-argument-instead-of-char
void split(const string& str, const string& delim, vector<string>& parts) {
  size_t start, end = 0;
  while (end < str.size()) {
    start = end;
    while (start < str.size() && (delim.find(str[start]) != string::npos)) {
      start++;  // skip initial whitespace
    }
    end = start;
    while (end < str.size() && (delim.find(str[end]) == string::npos)) {
      end++; // skip to end of word
    }
    if (end-start != 0) {  // just ignore zero-length strings.
      parts.push_back(string(str, start, end-start));
    }
  }
}

I admit this looks clunky compared to stringstream... In C I'd just use strtok or strtok_r, which has side-effects that one must stay aware of but makes a lot of problems stupidly simple.

Quote:
I am a bit stuck on the loading function, which parses the stream and loads it to the appropriate var in the col object.
On first look I'm left wondering, you DID resize the vector to accommodate all the elements it might need, yes? They don't grow automatically.
Quote:
Code:
// accepts a stringstream and parses the data in to columns
int metadata_row_toCol( stringstream &colsRowStream, 
                        std::vector<col_metadata>& metadata ){
   int i = 0;
   std::string rowCell;
   // parse row into cells, tab delimiter
   while(getline(colsRowStream,rowCell,'\t')) {
      metadata[i].content = rowCell;
      i++;
   }
   // clear the buffer
   colsRowStream.clear();
}

This above works, but is hard coded to put the data into metadata[i].content. I can't seem to see how I indicate that the first rows goes into content, but the next row goes into a different member. It seems like I should be passing a pointer to metadata[i].content, and not to the metadata vector of objects.
The difficulty arises because you're processing it a line at a time even though the data doesn't make sense as individual lines. Make a function that takes a file stream(or better yet, a general purpose istream), it will be able to read and process additional lines at need by whatever method you please.
 

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LEARN ABOUT PHP

strval

STRVAL(3)								 1								 STRVAL(3)

strval - Get string value of a variable

SYNOPSIS

       string strval (mixed  $var)

DESCRIPTION

	Get the string value of a variable. See the documentation on string for more information on converting to string.

	This function performs no formatting on the returned value. If you are looking for a way to format a numeric value as a string, please see
       sprintf(3) or number_format(3).

PARAMETERS

	      o $var
		- The variable that is being converted to a string. $var may be any scalar type or an  object  that  implements  the  __toString()
		method. You cannot use strval(3) on arrays or on objects that do not implement the __toString() method.

RETURN VALUES

	The string value of $var.

EXAMPLES

       Example #1

	      strval(3) example using PHP 5's magic __toString() method.

	      <?php
	      class StrValTest
	      {
		  public function __toString()
		  {
		      return __CLASS__;
		  }
	      }

	      // Prints 'StrValTest'
	      echo strval(new StrValTest);
	      ?>

SEE ALSO

       boolval(3), floatval(3), intval(3), settype(3), sprintf(3), number_format(3), Type juggling, __toString().

PHP Documentation Group 														 STRVAL(3)
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