Re: Alternative to strtok?

From:
"Carl Daniel [VC++ MVP]" <cpdaniel_remove_this_and_nospam@mvps.org.nospam>
Newsgroups:
microsoft.public.vc.language
Date:
Sun, 30 Mar 2008 18:14:22 -0700
Message-ID:
<#tzbOyskIHA.4536@TK2MSFTNGP06.phx.gbl>
Dave Cullen wrote:

Is there a more elegant way of parsing a delimited string in C++
other than strtok? The equivalent to VB's String.Split would be nice.

The string being parsed is read from a file, and semicolon delimited.
Variable length (field count). Strtok seems crude, tho it certainly
works. I'm just wondering if there's an alternative to making 50
calls to a function.

VC6 (MFC) but not .NET


Another problem with strtok is that it modifies the input string. In some
(many? most?) circumstances, that's not desirable. Here's a simple STL
solution:

<code>
#include <string>
#include <vector>
#include <iostream>

using namespace std;

void split_string(
 const string& str,
 char delimitter,
 vector<string>& ret
 )
{
 string::size_type delim;
 string::size_type prev_delim = 0;

 while (string::npos != (delim = str.find_first_of(delimitter,prev_delim)))
 {
  ret.push_back(str.substr(prev_delim,delim-prev_delim));
  prev_delim = delim+1;
 }

 // Get the tail after the last separator
 ret.push_back(str.substr(prev_delim));
}

// example usage
int main(int argc, char* argv[])
{
 if (3 > argc)
 {
    cerr << "usage: split_test pattern delimitter\n";
   return 1;
 }

 vector<string> args;
 split_string(argv[1],*argv[2],args);

 cout << args.size() << " arguments:\n";
 for (vector<string>::iterator it = args.begin(); it != args.end(); ++it)
   cout << "'" << *it << "'\n";
}
</code>

I have no idea if it works with VC6's impaired STL since I stopped using
that compiler 5+ years ago.

-cd

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