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boost::program_options::variable_value
// In header: <boost/program_options/variables_map.hpp> class variable_value { public: // construct/copy/destruct variable_value(); variable_value(const boost::any &, bool); // public member functions template<typename T> const T & as() const; template<typename T> T & as(); bool empty() const; bool defaulted() const; const boost::any & value() const; boost::any & value(); // friend functions friend BOOST_PROGRAM_OPTIONS_DECL void store(const basic_parsed_options< char > &, variables_map &, bool); };
Class holding value of option. Contains details about how the value is set and allows to conveniently obtain the value.
variable_value public member functionstemplate<typename T> const T & as() const;
If stored value if of type T, returns that value. Otherwise, throws boost::bad_any_cast exception.
template<typename T> T & as();
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
bool empty() const;Returns true if no value is stored.
bool defaulted() const;
Returns true if the value was not explicitly given, but has default value.
const boost::any & value() const;
Returns the contained value.
boost::any & value();
Returns the contained value.
variable_value friend functionsfriend BOOST_PROGRAM_OPTIONS_DECL void store(const basic_parsed_options< char > & options, variables_map & m, bool);
Stores in 'm' all options that are defined in 'options'. If 'm' already has a non-defaulted value of an option, that value is not changed, even if 'options' specify some value.