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boost::program_options::value
// In header: <boost/program_options/value_semantic.hpp> template<typename T> typed_value< T > * value(); template<typename T> typed_value< T > * value(T * v);
Creates a typed_value<T> instance. This function is the primary method to create value_semantic instance for a specific type, which can later be passed to 'option_description' constructor. The second overload is used when it's additionally desired to store the value of option into program variable.