Hi,
I have two questions re: the boost command line options library:
1) I am compiling a dynamic library that links to the boost command line options library as a shared library. When I try to unload the dynamic library, I find that it isn’t properly unloaded and the boost library seems to be causing the issue. I did find that things were helped somewhat when I linked to the boost static libraries. However, it still feels unstable. Are there any particular things I should know about in this context in terms of how my makefile should be linking to boost? Or are there other things I should look at.
2) When using program options, I am getting the following error. For some reason this seemed to work with the dynamic libraries (or it may be a coincidence). Am I required to implement the << and >> operators? It had been compiling previously and stopped. After googling this issue there seems to be a lot of confusion. Any help would be greatly appreciated.
in file included from /usr/include/boost/any.hpp:27:0,
from /usr/include/boost/program_options/value_semantic.hpp:12,
from /usr/include/boost/program_options/options_description.hpp:13,
from /usr/include/boost/program_options.hpp:15,
from /usr/local/src/freeswitch/src/mod/applications/mod_sc_dsp/mod_sc_dsp.cpp:23:
/usr/include/boost/lexical_cast.hpp: In instantiation of 'struct boost::detail::deduce_target_char_impl >':
/usr/include/boost/lexical_cast.hpp:415:89: required from 'struct boost::detail::deduce_target_char'
/usr/include/boost/lexical_cast.hpp:674:92: required from 'struct boost::detail::lexical_cast_stream_traits'
/usr/include/boost/lexical_cast.hpp:2363:19: required from 'static Target boost::detail::lexical_cast_do_cast::lexical_cast_impl(const Source&) [with Target = dsp_type; Source = std::basic_string<char>]'
/usr/include/boost/lexical_cast.hpp:2543:50: required from 'Target boost::lexical_cast(const Source&) [with Target = dsp_type; Source = std::basic_string<char>]'
/usr/include/boost/program_options/detail/value_semantic.hpp:89:38: required from 'void boost::program_options::validate(boost::any&, const std::vector&, T*, long int) [with T = dsp_type; charT = char]'
/usr/include/boost/program_options/detail/value_semantic.hpp:170:55: required from 'void boost::program_options::typed_value::xparse(boost::any&, const std::vector&) const [with T = dsp_type; charT = char]'
/usr/local/src/freeswitch/src/mod/applications/mod_sc_dsp/mod_sc_dsp.cpp:484:1: required from here
/usr/include/boost/lexical_cast.hpp:388:13: error: static assertion failed: Target type is neither std::istream`able nor std::wistream`able
BOOST_STATIC_ASSERT_MSG((result_t::value || boost::has_right_shift, T >::value),
desc.add_options()
("help", "Generates help message")
("dsp_type", po::value(¶ms.dsp_type)->required(), “")
where dsp_type is this:
struct dsp_type {
dsp_type() {}
dsp_type(std::string const& val):
value(val)
{ }
std::string value;
};
and I have a validator defined as this:
void validate(boost::any& v,
std::vectorstd::string const& values,
dsp_type* /* target_type */,
int)
{
using namespace boost::program_options;
//namespace po = boost::program_options;
// Make sure no previous assignment to 'v' was made.
validators::check_first_occurrence(v);
// Extract the first string from 'values'. If there is more than
// one string, it's an error, and exception will be thrown.
std::string const& s = validators::get_single_string(values);
if (s == "ladspa" || s == "audioweaver" || s == "gstreamer" || s == "lv2") {
v = boost::any(dsp_type(s));
} else {
throw validation_error(validation_error::invalid_option_value);
}
}
/usr/local/src/freeswitch/build/modmake.rules:214: recipe for target 'mod_sc_dsp.lo' failed
make[1]: *** [mod_sc_dsp.lo] Error 1
