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copied!<p>If you don't mind using the Boost libraries...</p> <pre><code>#include <string> #include <vector> #include <boost/lexical_cast.hpp> #include <boost/regex.hpp> std::vector<int> ParseFile(std::istream& in) { const boost::regex cItemPattern(" *([0-9]+),?"); std::vector<int> return_value; std::string line; while (std::getline(in, line)) { string::const_iterator b=line.begin(), e=line.end(); boost::smatch match; while (b!=e && boost::regex_search(b, e, match, cItemPattern)) { return_value.push_back(boost::lexical_cast<int>(match[1].str())); b=match[0].second; }; }; return return_value; } </code></pre> <p>That pulls the lines from the stream, then uses the Boost::RegEx library (with a capture group) to extract each number from the lines. It automatically ignores anything that isn't a valid number, though that can be changed if you wish.</p> <p>It's still about twenty lines with the <code>#include</code>s, but you can use it to extract essentially <em>anything</em> from the file's lines. This is a trivial example, I'm using pretty much identical code to extract tags and optional values from a database field, the only major difference is the regular expression.</p> <p>EDIT: Oops, you wanted three separate vectors. Try this slight modification instead:</p> <pre><code>const boost::regex cItemPattern(" *([0-9]+), *([0-9]+), *([0-9]+)"); std::vector<int> vector1, vector2, vector3; std::string line; while (std::getline(in, line)) { string::const_iterator b=line.begin(), e=line.end(); boost::smatch match; while (b!=e && boost::regex_search(b, e, match, cItemPattern)) { vector1.push_back(boost::lexical_cast<int>(match[1].str())); vector2.push_back(boost::lexical_cast<int>(match[2].str())); vector3.push_back(boost::lexical_cast<int>(match[3].str())); b=match[0].second; }; }; </code></pre>

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