According to documentation I can parse config files in style :
[main section]
string = hello world.
[foo]
message = Hi !
But I need to parse list of plugins :
[plugins]
somePlugin.
HelloWorldPlugin
AnotherPlugin
[settings]
type = hello world
How can I get vector of strings which are in plugins section ?
For boost program options config files, if the line is not declaring a section, such as [settings], then it needs to be in a name=value format. For your example, write it as the following:
[plugins] name = somePlugin name = HelloWorldPlugin name = AnotherPlugin [settings] type = hello world
The list of plugins will now correspond to the "plugins.name" option, which needs to be a multitoken option.
Below is an example program that reads the above settings from a settings.ini file:
#include <boost/program_options.hpp>
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
int main()
{
namespace po = boost::program_options;
typedef std::vector< std::string > plugin_names_t;
plugin_names_t plugin_names;
std::string settings_type;
// Setup options.
po::options_description desc("Options");
desc.add_options()
("plugins.name", po::value< plugin_names_t >( &plugin_names )->multitoken(),
"plugin names" )
("settings.type", po::value< std::string >( &settings_type ),
"settings_type" );
// Load setting file.
po::variables_map vm;
std::ifstream settings_file( "settings.ini" , std::ifstream::in );
po::store( po::parse_config_file( settings_file , desc ), vm );
settings_file.close();
po::notify( vm );
// Print settings.
typedef std::vector< std::string >::iterator iterator;
for ( plugin_names_t::iterator iterator = plugin_names.begin(),
end = plugin_names.end();
iterator < end;
++iterator )
{
std::cout << "plugin.name: " << *iterator << std::endl;
}
std::cout << "settings.type: " << settings_type << std::endl;
return 0;
}
Which produces the following output:
plugin.name: somePlugin plugin.name: HelloWorldPlugin plugin.name: AnotherPlugin settings.type: hello world