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copied!<p>One approach is to tokenize <code>std::string</code> into a <code>std::vector<std::string></code>, then pass the result to Boost.ProgramOption's <a href="http://www.boost.org/doc/libs/1_54_0/doc/html/boost/program_options/basic_command_line_parser.html" rel="nofollow noreferrer"><code>command_line_parser</code></a>. The Boost.ProgramOption's <a href="http://www.boost.org/doc/libs/1_54_0/doc/html/program_options/howto.html#idp123410640" rel="nofollow noreferrer">documentation</a> briefly covers this approach. Additionally, I use a similar approach in part of <a href="https://stackoverflow.com/a/12513321/1053968">this</a> answer.</p> <p>Here is a minimal complete example:</p> <pre><code>#include <algorithm> #include <iostream> #include <iterator> #include <string> #include <vector> #include <boost/bind.hpp> #include <boost/program_options.hpp> #include <boost/tokenizer.hpp> // copy_if was left out of the C++03 standard, so mimic the C++11 // behavior to support all predicate types. The alternative is to // use remove_copy_if, but it only works for adaptable functors. template <typename InputIterator, typename OutputIterator, typename Predicate> OutputIterator copy_if(InputIterator first, InputIterator last, OutputIterator result, Predicate pred) { while(first != last) { if(pred(*first)) *result++ = *first; ++first; } return result; } /// @brief Tokenize a string. The tokens will be separated by each non-quoted /// space or equal character. Empty tokens are removed. /// /// @param input The string to tokenize. /// /// @return Vector of tokens. std::vector<std::string> tokenize(const std::string& input) { typedef boost::escaped_list_separator<char> separator_type; separator_type separator("\\", // The escape characters. "= ", // The separator characters. "\"\'"); // The quote characters. // Tokenize the intput. boost::tokenizer<separator_type> tokens(input, separator); // Copy non-empty tokens from the tokenizer into the result. std::vector<std::string> result; copy_if(tokens.begin(), tokens.end(), std::back_inserter(result), !boost::bind(&std::string::empty, _1)); return result; } int main() { // Variables that will store parsed values. std::string address; unsigned int port; // Setup options. namespace po = boost::program_options; po::options_description desc("Options"); desc.add_options() ("address", po::value<std::string>(&address)) ("port", po::value<unsigned int>(&port)) ; // Mock up input. std::string input = "--address 127.0.0.1 --port 12345"; // Parse mocked up input. po::variables_map vm; po::store(po::command_line_parser(tokenize(input)) .options(desc).run(), vm); po::notify(vm); // Output. std::cout << "address = " << address << "\n" "port = " << port << std::endl; } </code></pre> <p>Which produces the following output:</p> <pre class="lang-none prettyprint-override"><code>address = 127.0.0.1 port = 12345 </code></pre>

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