id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
564	program_options: additional parser bug	nobody	Vladimir Prus	"{{{
alexander.kondratyuk@gmail.com
It seems there is a bug in additional parser wrapper -
 in case then my option has no parameters defined and 
declared in description, it adds an empty value to 
the vector of values when additional paser returns 
pair of strings. 
 
Changing code in cmdline.cpp in function
    cmdline::handle_additional_parser
from 
            next.value.push_back(r.second);
to

            if (!r.second.empty())
                next.value.push_back(r.second);
will fix the problem.

Here is an example that illustrates the problem:
 
#define BOOST_WHATEVER_DYN_LINK
#define BOOST_LIB_DIAGNOSTIC 
#include <boost/program_options/variables_map.hpp>
#include 
<boost/program_options/options_description.hpp>
#include <boost/program_options/parsers.hpp> 
#include 
<boost/program_options/detail/utf8_codecvt_facet.hpp>
#include <boost/token_iterator.hpp>
#include <boost/shared_ptr.hpp>
using namespace boost::program_options;
#include <string>
#include <vector>
using namespace std;

pair<string, string> parserDashDashShort(const 
string& s)
{
    string str = s.substr( 0, s.find('=') );
    if( str.length()==3 && str[0]=='-' && str[1]=='-' 
&& str[2]<='z' && str[2]>='a') 
    {
        string val = s.substr(str.length());
        return make_pair( str.substr(1), val );
    }
    return make_pair(string(), string());
}

int _tmain(int , _TCHAR* argv[])
{
    int style = 
        command_line_style::allow_short|
        command_line_style::allow_dash_for_short |
        command_line_style::short_allow_adjacent;

   options_description desc;
    desc.add_options()
        (""help,h"", ""help message"")
    ;

    char* args[]={""program.exe"", ""--h""};    
    int argc = sizeof( args ) / sizeof( args[0] );
    parse_command_line<char>( argc, (char**)args, 
desc, style, parserDashDashShort ); 
 return 0;
}

}}}"	Bugs	closed		None	None		Fixed