fcppt::options::optional< Parser > Class Template Reference

Detailed Description

template<typename Parser>
class fcppt::options::optional< Parser >

An optional parser.

Wraps a parser such that it may fail. The result type is a record that adds one layer of fcppt::optional::object to the elements of the result type of Parser.

See also

fcppt::options::make_optional

Public Types
using	result_type

Public Member Functions
	optional (Parser &&)
fcppt::options::parse_result< result_type >	parse (fcppt::options::state &&, fcppt::options::parse_context const &) const
fcppt::options::flag_name_set	flag_names () const
fcppt::options::option_name_set	option_names () const
fcppt::options::usage	usage () const

Member Typedef Documentation

result_type

template<typename Parser >

using fcppt::options::optional< Parser >::result_type

Initial value:

 fcppt::record::map_elements<
      fcppt::options::result_of<Parser>,
      fcppt::mpl::bind<
          fcppt::mpl::lambda<fcppt::optional::object>,
          fcppt::mpl::
              bind<fcppt::mpl::lambda<fcppt::record::element_to_type>, fcppt::mpl::arg<1>>>>

Constructor & Destructor Documentation

optional()

template<typename Parser >

fcppt::options::optional< Parser >::optional ( Parser && )

explicit

Member Function Documentation

flag_names()

template<typename Parser >

fcppt::options::flag_name_set fcppt::options::optional< Parser >::flag_names ( ) const

nodiscard

option_names()

template<typename Parser >

fcppt::options::option_name_set fcppt::options::optional< Parser >::option_names ( ) const

nodiscard

parse()

template<typename Parser >

fcppt::options::parse_result< result_type > fcppt::options::optional< Parser >::parse ( fcppt::options::state && , fcppt::options::parse_context const &  ) const

nodiscard

usage()

template<typename Parser >

fcppt::options::usage fcppt::options::optional< Parser >::usage ( ) const

nodiscard