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>]
--
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Ryan Gallagher
Sanjit Jhala
TSalm
Vladimir Prus