[boost] [program options] Recommended way to specify a list of strings

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Strange issue with Serialization...

Sanjit Jhala

21 Dec 2009 21 Dec '09

10:45 p.m.

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

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Ryan Gallagher

22 Dec 22 Dec

12:21 a.m.

New subject: [Boost-users] [boost] [program options] Recommended way to specify a list of strings

Sanjit Jhala 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::vectorstd::string as the option value? ("server", po::value< vector<string> >() See the "Option Details" section in the tutorial: http://tinyurl.com/yd95h2r HTH, -Ryan

Sanjit Jhala

12:37 a.m.

New subject: [boost] [program options] Recommended way to specify a list of strings

Thanks Ryan, this should work for me. -Sanjit On Mon, Dec 21, 2009 at 4:21 PM, Ryan Gallagher wrote:

...

Sanjit Jhala 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::vectorstd::string as the option value?

("server", po::value< vector<string> >()

See the "Option Details" section in the tutorial:

http://tinyurl.com/yd95h2r

HTH,

-Ryan

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Sanjit Jhala

23 Dec 23 Dec

2:29 a.m.

New subject: [boost] [program options] Recommended way to specify a list of strings

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 wrote:

...

Thanks Ryan, this should work for me.

-Sanjit

On Mon, Dec 21, 2009 at 4:21 PM, Ryan Gallagher wrote:

...
Sanjit Jhala 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::vectorstd::string as the option value?

("server", po::value< vector<string> >()

See the "Option Details" section in the tutorial:

http://tinyurl.com/yd95h2r

HTH,

-Ryan

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

Vladimir Prus

6:04 a.m.

New subject: [boost] [program options] Recommended way to specify a list of strings

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

TSalm

30 Dec 30 Dec

6:10 p.m.

New subject: [boost] [program options] Recommended way to specify a list of strings

Le Wed, 23 Dec 2009 07:04:19 +0100, Vladimir Prus 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 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::operator<<(const Source&) [with Target = std::basic_string, Source = std::vector, std::allocator > >]’: /usr/include/boost/lexical_cast.hpp:222: instantiated from ‘Target boost::lexical_cast(const Source&) [with Target = std::basic_string, Source = std::vector, std::allocator > >]’ /usr/include/boost/program_options/value_semantic.hpp:190: instantiated from ‘boost::program_options::typed_value* boost::program_options::typed_value::default_value(const T&) [with T = std::vector, std::allocator > >, 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::vector, std::allocator > >

...

*)this)->boost::detail::lexical_stream, std::vector, std::allocator > > >::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>]

-- Utilisant le client e-mail révolutionnaire d'Opera : http://www.opera.com/mail/

TSalm

1 Jan 1 Jan

4:20 p.m.

New subject: [boost] [program options] Recommended way to specify a list of strings

...

...
...
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

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);

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Ryan Gallagher
Sanjit Jhala
TSalm
Vladimir Prus