Parsing LPTSTR* command line args with boost::program_options

Question

I am having a problem with command line parsing with boost:program_options. The quickest way to explain it is to show the code so:

const std::vector<tstring> args;
if (ac > 0 && NULL!=av) //ac is a ULONG
{
    for (int i = 0; i < ac; i++) 
    {
        args.push_back(av[i]); //av is an LPTSTR pointer (pointer to TCHAR*)
    }

    }
    po::command_line_parser parser(args);

The parser ctor is supposed to take a const std::vector<charT>

typedef basic_command_line_parser<char> command_line_parser;
typedef basic_command_line_parser<wchar_t> wcommand_line_parser;

/** Creates instance of 'command_line_parser', passes parameters to it,
    and returns the result of calling the 'run' method.        
 */
template<class charT>
    class basic_command_line_parser : private detail::cmdline {
    public:
        /** Creates a command line parser for the specified arguments
            list. The 'args' parameter should not include program name.
        */
        basic_command_line_parser(const std::vector<
                                  std::basic_string<charT> >& args);

tstring in my program is

typedef std::basic_string<TCHAR> tstring;

The error I get is:

Error   16  error C2664: 'boost::program_options::basic_command_line_parser<charT>::basic_command_line_parser(const std::vector<_Ty> &)' : cannot convert parameter 1 from 'const std::vector<_Ty>' to 'const std::vector<_Ty> &'   myfile.cpp  329

Where, oh where, am I going astray? I've tried all kinds of casting and re-defining, but nothing has worked and I'm at the end of my tether.

Edit @Zac:
Making the changes you suggested... I get the error:

Error   14  error C2664: boost::program_options::basic_command_line_parser<charT>::basic_command_line_parser(const std::vector<_Ty> &)' : cannot convert parameter 1 from 'std::vector<_Ty>' to 'const std::vector<_Ty> &'  MyFile.cpp  328

Edit Just to point out that I am using Visual Studio 2008 VC9 compiler

Answer 1

You seem to be using a unicode build, so either explicitly use the wide char version:

po::wcommand_line_parser parser(args);

or the more flexible:

po::basic_command_line_parser<TCHAR> parser(args);

Answer 2

The line you went astray with is below:

const std::vector<tstring> args;

Change it to:

std::vector<tstring> args;