options_description(unsigned line_length = m_default_line_length);

Creates the instance.

options_description(const std::string & caption, 
                    unsigned line_length = m_default_line_length);

Creates the instance. The 'caption' parameter gives the name of this 'options_description' instance. Primarily useful for output.

void add(shared_ptr< option_description > desc) ;

Adds new variable description. Throws duplicate_variable_error if either short or long name matches that of already present one.

options_description & add(const options_description & desc) ;

Adds a group of option description. This has the same effect as adding all option_descriptions in 'desc' individually, except that output operator will show a separate group. Returns *this.

options_description_easy_init add_options() ;

Returns an object of implementation-defined type suitable for adding options to options_description. The returned object will have overloaded operator() with parameter type matching 'option_description' constructors. Calling the operator will create new option_description instance and add it.

const option_description & find(const std::string & name, bool approx) const;

const option_description * 
find_nothrow(const std::string & name, bool approx) const;

const std::vector< shared_ptr< option_description > > & options() const;

void print(std::ostream & os) const;

Output 'desc' to the specified stream, calling 'f' to output each option_description element.