fcppt::either Namespace Reference

Contains fcppt::either::object and helper types/functions for it. More...

Classes
struct	is_object
struct	is_object< fcppt::either::object< Failure, Success > >
struct	no_error
class	object

Typedefs
template<typename Failure >
using	error = fcppt::either::object<Failure, fcppt::either::no_error>
	An either without a success value.
template<fcppt::either::object_concept Either>
using	failure_move_type
	The moved failure type of an either.
template<fcppt::either::object_concept Either>
using	failure_reference_type = decltype(std::declval<Either>().get_failure_unsafe())
	The failure reference type of an either.
template<fcppt::either::object_concept Either>
using	failure_type = typename std::remove_cvref_t<Either>::failure
	The failure type of an either.
template<fcppt::either::object_concept Either>
using	success_move_type
	The moved success type of an either.
template<fcppt::either::object_concept Either>
using	success_reference_type = decltype(std::declval<Either>().get_success_unsafe())
	The success reference type of an either.
template<fcppt::either::object_concept Either>
using	success_type = typename std::remove_cvref_t<Either>::success
	The success type of an either.

Functions
template<fcppt::either::object_concept Either1, fcppt::either::object_concept... Eithers, fcppt::concepts::invocable_move< fcppt::either::success_move_type< Either1 >, fcppt::either::success_move_type< Eithers >... > Function> requires ( std::is_same_v<fcppt::either::failure_type<Either1>, fcppt::either::failure_type<Eithers>> &&...)
fcppt::either::object< fcppt::either::failure_type< Either1 >, std::invoke_result_t< Function, fcppt::either::success_move_type< Either1 >, fcppt::either::success_move_type< Eithers >... > >	apply (Function const &_function, Either1 &&_either1, Eithers &&..._eithers)
	Applies a function to several eithers.
template<fcppt::either::object_concept Either, fcppt::concepts::invocable_move< fcppt::either::success_move_type< Either > > Function> requires fcppt::either::is_object_v< std::invoke_result_t<Function, fcppt::either::success_move_type<Either>>> && std::is_same_v< fcppt::either::failure_type<Either>, fcppt::either::failure_type< std::invoke_result_t<Function, fcppt::either::success_move_type<Either>>>>
std::invoke_result_t< Function, fcppt::either::success_move_type< Either > >	bind (Either &&_either, Function const &_function)
	Monadic bind on the success type of an either.
template<typename Failure , typename Success >
bool	operator== (fcppt::either::object< Failure, Success > const &_a, fcppt::either::object< Failure, Success > const &_b)
	Compares two eithers for equality.
template<typename Failure , typename Success >
bool	operator!= (fcppt::either::object< Failure, Success > const &_a, fcppt::either::object< Failure, Success > const &_b)
	Compares two eithers for inequality.
template<fcppt::concepts::invocable_move Failure, fcppt::concepts::invocable_move Success>
fcppt::either::object< std::invoke_result_t< Failure >, std::invoke_result_t< Success > >	construct (bool const _value, Success const &_success, Failure const &_failure)
	Constructs an either by calling one of two functions.
template<fcppt::optional::object_concept Optional>
fcppt::either::error< fcppt::optional::value_type< Optional > >	error_from_optional (Optional &&_optional)
	Converts an optional error to an either.
template<fcppt::either::object_concept Either>
fcppt::optional::object< fcppt::either::failure_type< Either > >	failure_opt (Either &&_either)
	Returns the failure type as an optional.
template<typename Functions > requires fcppt::concepts::invocable_move<fcppt::type_traits::value_type<Functions>> && fcppt::either::is_object_v<std::invoke_result_t<fcppt::type_traits::value_type<Functions>>>
fcppt::either::object< std::vector< fcppt::either::failure_type< std::invoke_result_t< fcppt::type_traits::value_type< Functions > > > >, fcppt::either::success_type< std::invoke_result_t< fcppt::type_traits::value_type< Functions > > > >	first_success (Functions const &_functions)
	Call a container of functions, returning their first success or a container of failures.
template<fcppt::optional::object_concept Optional, fcppt::concepts::invocable_move FailureFunction>
fcppt::either::object< std::invoke_result_t< FailureFunction >, fcppt::optional::value_type< Optional > >	from_optional (Optional &&_optional, FailureFunction const &_failure_function)
	Converts an optional to an either.
template<fcppt::either::object_concept Either> requires fcppt::either::is_object_v<fcppt::either::success_type<Either>> && std::is_same_v< fcppt::either::failure_type<Either>, fcppt::either::failure_type<fcppt::either::success_type<Either>>>
fcppt::either::object< fcppt::either::failure_type< Either >, fcppt::either::success_type< fcppt::either::success_type< Either > > >	join (Either &&_either)
	Removes one layer of eithers.
template<fcppt::concepts::invocable_move Next, fcppt::concepts::invocable< fcppt::either::success_type< std::invoke_result_t< Next > > > Loop> requires fcppt::either::is_object_v<std::invoke_result_t<Next>>
fcppt::either::failure_type< std::invoke_result_t< Next > >	loop (Next const &_next, Loop const &_loop)
	Loops a function returning an either.
template<fcppt::concepts::move_constructible Success, typename Failure >
fcppt::either::object< std::remove_cvref_t< Failure >, Success >	make_failure (Failure &&_failure)
	Create an either with a failure.
template<fcppt::concepts::move_constructible Failure, typename Success >
fcppt::either::object< Failure, std::remove_cvref_t< Success > >	make_success (Success &&_success)
	Create an either with a success.
template<fcppt::either::object_concept Either, fcppt::concepts::invocable_move< fcppt::either::success_move_type< Either > > Function>
fcppt::either::object< fcppt::either::failure_type< Either >, std::invoke_result_t< Function, fcppt::either::success_move_type< Either > > >	map (Either &&_either, Function const &_function)
	Maps over the success type of an either.
template<fcppt::either::object_concept Either, fcppt::concepts::invocable_move< fcppt::either::failure_move_type< Either > > Function>
fcppt::either::object< std::invoke_result_t< Function, fcppt::either::failure_move_type< Either > >, fcppt::either::success_type< Either > >	map_failure (Either &&_either, Function const &_function)
	Maps over the failure type of an either.
template<fcppt::either::object_concept Either, fcppt::concepts::invocable< fcppt::either::failure_move_type< Either > > FailureFunction, fcppt::concepts::invocable< fcppt::either::success_move_type< Either > > SuccessFunction> requires std::is_same_v< std::invoke_result_t<SuccessFunction, fcppt::either::success_move_type<Either>>, std::invoke_result_t<FailureFunction, fcppt::either::failure_move_type<Either>>>
std::invoke_result_t< SuccessFunction, fcppt::either::success_move_type< Either > >	match (Either &&_either, FailureFunction const &_failure_function, SuccessFunction const &_success_function)
	Matches on the two cases of an either.
bool	operator== (fcppt::either::no_error const &, fcppt::either::no_error const &)
	Comparison of fcppt::either::no_error.
template<typename Ch , typename Traits >
std::basic_ostream< Ch, Traits > &	operator<< (std::basic_ostream< Ch, Traits > &_stream, fcppt::either::no_error const &)
	Outputs fcppt::either::no_error.
template<typename Failure , typename Success , typename Ch , typename Traits >
std::basic_ostream< Ch, Traits > &	operator<< (std::basic_ostream< Ch, Traits > &_stream, fcppt::either::object< Failure, Success > const &_either)
	Outputs an either to a basic_ostream.
template<fcppt::either::object_concept Result, typename Source >
Result	sequence (Source &&_source)
	Sequences a container of eithers.
template<typename Sequence , fcppt::concepts::invocable_move< fcppt::container::to_value_type< std::remove_reference_t< Sequence > > > Function> requires fcppt::either::is_object_v<std::invoke_result_t< Function, fcppt::container::to_value_type<std::remove_reference_t<Sequence>>>> && std::is_same_v< fcppt::either::success_type<std::invoke_result_t< Function, fcppt::container::to_value_type<std::remove_reference_t<Sequence>>>>, fcppt::either::no_error>
std::invoke_result_t< Function, fcppt::container::to_value_type< std::remove_reference_t< Sequence > > >	sequence_error (Sequence &&_sequence, Function const &_function)
	Folds over a range, breaking out on the first error.
template<fcppt::either::object_concept Either>
fcppt::optional::object< fcppt::either::success_type< Either > >	success_opt (Either &&_either)
	Returns the success type as an optional.
template<fcppt::either::object_concept Either, fcppt::concepts::invocable_move< fcppt::either::failure_move_type< Either > > MakeException>
fcppt::either::success_move_type< Either >	to_exception (Either &&_either, MakeException const _make_exception)
	Returns the success value contained in an either or throws an exception.
template<fcppt::concepts::move_constructible Exception, fcppt::concepts::invocable_move Function, fcppt::concepts::invocable_move< Exception > ToException>
FCPPT_PP_PUSH_WARNING fcppt::either::object< std::invoke_result_t< ToException, Exception >, std::invoke_result_t< Function > >	try_call (Function const &_function, ToException const &_to_exception)
	Catches exceptions of a function call and puts the result in an either.

Variables
template<typename T >
constexpr bool	is_object_v = fcppt::either::is_object<T>::value
	Checks if a given type is an fcppt::either::object.

Detailed Description

Contains fcppt::either::object and helper types/functions for it.