fcppt::options::sum< Label, Left, Right > Class Template Reference

Detailed Description

template<typename Label, typename Left, typename Right>
class fcppt::options::sum< Label, Left, Right >

A sum of two parsers.

This parser first tries its left parser and if that succeeds returns its result. Otherwise, it tries the right parser and returns its result.

Classes
struct	left
struct	right

Public Types
using	left_result = fcppt::options::result_of<Left>
using	right_result = fcppt::options::result_of<Right>
using	variant
using	result_type = fcppt::record::object<fcppt::record::element<Label, variant>>

Public Member Functions
	sum (Left &&, Right &&)
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

left_result

template<typename Label, typename Left, typename Right>

using fcppt::options::sum< Label, Left, Right >::left_result = fcppt::options::result_of<Left>

result_type

template<typename Label, typename Left, typename Right>

using fcppt::options::sum< Label, Left, Right >::result_type = fcppt::record::object<fcppt::record::element<Label, variant>>

right_result

template<typename Label, typename Left, typename Right>

using fcppt::options::sum< Label, Left, Right >::right_result = fcppt::options::result_of<Right>

variant

template<typename Label, typename Left, typename Right>

using fcppt::options::sum< Label, Left, Right >::variant

Initial value:

 fcppt::variant::
      object<fcppt::options::left<left_result>, fcppt::options::right<right_result>>

Constructor & Destructor Documentation

sum()

template<typename Label, typename Left, typename Right>

fcppt::options::sum< Label, Left, Right >::sum	(	Left &&	,
		Right &&	)

Member Function Documentation

flag_names()

template<typename Label, typename Left, typename Right>

fcppt::options::flag_name_set fcppt::options::sum< Label, Left, Right >::flag_names ( ) const

nodiscard

option_names()

template<typename Label, typename Left, typename Right>

fcppt::options::option_name_set fcppt::options::sum< Label, Left, Right >::option_names ( ) const

nodiscard

parse()

template<typename Label, typename Left, typename Right>

fcppt::options::parse_result< result_type > fcppt::options::sum< Label, Left, Right >::parse ( fcppt::options::state && , fcppt::options::parse_context const &  ) const

nodiscard

usage()

template<typename Label, typename Left, typename Right>

fcppt::options::usage fcppt::options::sum< Label, Left, Right >::usage ( ) const

nodiscard