[boost] [program options] Recommended way to specify a list of strings
Say I want to specify a list of servers via the boost program_options library. Something like: --total-servers N --server srv1 --server srv2 ... --server srvN How would I do this? It doesn't look like multitoken would work for this case, so would it be better for me to just have something like: --total-servers N --serverlist srv1 srv2 ... srvN and use a single string to store the serverlist and parse it myself? -Sanjit
Sanjit Jhala <sjhalaz <at> gmail.com> writes:
Say I want to specify a list of servers via the boost program_options library. Something like: --total-servers N --server srv1 --server srv2 ... --server srvN How would I do this?
Have you tried sending a std::vector<std::string> as the option value? ("server", po::value< vector<string> >() See the "Option Details" section in the tutorial: http://tinyurl.com/yd95h2r HTH, -Ryan
Thanks Ryan, this should work for me. -Sanjit On Mon, Dec 21, 2009 at 4:21 PM, Ryan Gallagher <ryan.gallagher@gmail.com>wrote:
Sanjit Jhala <sjhalaz <at> gmail.com> writes:
Say I want to specify a list of servers via the boost program_options library. Something like: --total-servers N --server srv1 --server srv2 ... --server srvN How would I do this?
Have you tried sending a std::vector<std::string> as the option value?
("server", po::value< vector<string> >()
See the "Option Details" section in the tutorial:
HTH,
-Ryan
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How would I specify an empty vector of strings as the default value for this option? po::value< vector<string> >()->default_value(??) -Sanjit On Mon, Dec 21, 2009 at 4:37 PM, Sanjit Jhala <sjhalaz@gmail.com> wrote:
Thanks Ryan, this should work for me.
-Sanjit
On Mon, Dec 21, 2009 at 4:21 PM, Ryan Gallagher <ryan.gallagher@gmail.com>wrote:
Sanjit Jhala <sjhalaz <at> gmail.com> writes:
Say I want to specify a list of servers via the boost program_options library. Something like: --total-servers N --server srv1 --server srv2 ... --server srvN How would I do this?
Have you tried sending a std::vector<std::string> as the option value?
("server", po::value< vector<string> >()
See the "Option Details" section in the tutorial:
HTH,
-Ryan
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
Sanjit Jhala wrote:
How would I specify an empty vector of strings as the default value for this option?
po::value< vector<string> >()->default_value(??)
Use vector<string>() as the default value. - Volodya
Le Wed, 23 Dec 2009 07:04:19 +0100, Vladimir Prus <vladimir@codesourcery.com> a écrit:
Sanjit Jhala wrote:
How would I specify an empty vector of strings as the default value for this option?
po::value< vector<string> >()->default_value(??)
Use vector<string>() as the default value.
Hi, I have the same problem. But when I'm using : configuration.add_options() ("DEFAULT.bytecompile",program_options::value< vector<string>
()->default_value(vector<string>())) ;
G++ won't compile. Here is the complete source code : #include <vector> #include <boost/program_options.hpp> int main(int argc, char** argv) { using namespace std; using namespace boost; program_options::options_description configuration; boost::program_options::variables_map vm; vector<string> empty_vector; // Set options and default values configuration.add_options() ("DEFAULT.bytecompile",program_options::value< vector<string>
()->default_value(vector<string>())) ;
program_options::store ( program_options::parse_command_line(argc, argv, configuration) , vm ); program_options::notify( vm ); return 0; } And the error message : /usr/include/boost/lexical_cast.hpp: In member function ‘bool boost::detail::lexical_stream<Target, Source>::operator<<(const Source&) [with Target = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, Source = std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >]’: /usr/include/boost/lexical_cast.hpp:222: instantiated from ‘Target boost::lexical_cast(const Source&) [with Target = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, Source = std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >]’ /usr/include/boost/program_options/value_semantic.hpp:190: instantiated from ‘boost::program_options::typed_value<T, charT>* boost::program_options::typed_value<T, charT>::default_value(const T&) [with T = std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, charT = char]’ config_file__vector.cpp:16: instantiated from here /usr/include/boost/lexical_cast.hpp:151: error: no match for ‘operator<<’ in ‘((boost::detail::lexical_stream<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >
*)this)->boost::detail::lexical_stream<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::stream << input’ /usr/include/c++/4.3/ostream:112: note: candidates are: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>& (*)(std::basic_ostream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:121: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ios<_CharT, _Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:131: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:169: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:173: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:177: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(bool) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/bits/ostream.tcc:97: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:184: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short unsigned int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/bits/ostream.tcc:111: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:195: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(unsigned int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:204: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:208: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:213: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(double) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:217: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(float) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:225: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/ostream:229: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(const void*) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.3/bits/ostream.tcc:125: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_streambuf<_CharT, _Traits>*) [with _CharT = char, _Traits = std::char_traits<char>]
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How would I specify an empty vector of strings as the default value for this option?
po::value< vector<string> >()->default_value(??)
Use vector<string>() as the default value.
Hi,
I have the same problem. But when I'm using :
configuration.add_options() ("DEFAULT.bytecompile",program_options::value< vector<string>
()->default_value(vector<string>())) ;
G++ won't compile.
Here is the complete source code :
#include <vector> #include <boost/program_options.hpp>
int main(int argc, char** argv) { using namespace std; using namespace boost;
program_options::options_description configuration; boost::program_options::variables_map vm; vector<string> empty_vector;
// Set options and default values configuration.add_options() ("DEFAULT.bytecompile",program_options::value< vector<string>
()->default_value(vector<string>())) ;
program_options::store ( program_options::parse_command_line(argc, argv, configuration) , vm );
program_options::notify( vm );
return 0; }
Ok. The solution is to specify a "textual" parameter : ("DEFAULT.bytecompile",program_options::value< vector<string>
()->default_value(vector<string>(),"")
/** Specifies default value, which will be used if none is explicitly specified. Unlike the above overload, the type 'T' need not provide operator<< for ostream, but textual representation of default value must be provided by the user. */ typed_value* default_value(const T& v, const std::string& textual);
participants (4)
-
Ryan Gallagher -
Sanjit Jhala -
TSalm -
Vladimir Prus