Always empty iterator (equivalent to end()) More...

#include <enumerator.h>

Inheritance diagram for P4::Util::EmptyEnumerator< T >:

Public Member Functions
T	getCurrent () const override
	Get current element in the collection.

bool	moveNext () override
	Always returns false.

std::string	toString () const

Public Member Functions inherited from P4::Util::Enumerator< T >
bool	any ()
	True if the enumerator has at least one element.

template<typename S>
Enumerator< S > *	as ()
	Cast to an enumerator of S objects.

EnumeratorHandle< T >	begin ()

virtual Enumerator< T > *	concat (Enumerator< T > *other)
	Append all elements of other after all elements of this.

uint64_t	count ()
	Enumerate all elements and return the count.

EnumeratorHandle< T >	end ()

template<typename Mapper>
Enumerator< std::invoke_result_t< Mapper, T > > *	map (Mapper map)
	Apply specified function to all elements of this enumerator.

T	next ()
	Next element; throws if there are no elements.

T	nextOrDefault ()
	Next element, or the default value if none exists.

virtual void	reset ()
	Move back to the beginning of the collection.

T	single ()
	The only next element; throws if the enumerator does not have exactly 1 element.

T	singleOrDefault ()

const char *	stateName () const

std::vector< T >	toVector ()

template<typename Filter>
Enumerator< T > *	where (Filter filter)
	Return an enumerator returning all elements that pass the filter.

Additional Inherited Members
Public Types inherited from P4::Util::Enumerator< T >
using	value_type = T

Static Public Member Functions inherited from P4::Util::Enumerator< T >
static Enumerator< T > *	concatAll (Enumerator< Enumerator< T > * > *inputs)
	Concatenate all these collections into a single one.

template<typename Container>
static Enumerator< typename Container::value_type > *	createEnumerator (const Container &data)

template<typename Iter>
static Enumerator< typename Iter::value_type > *	createEnumerator (Iter begin, Iter end)

template<typename Iter>
static Enumerator< typename Iter::value_type > *	createEnumerator (iterator_range< Iter > range)

static Enumerator< T > *	emptyEnumerator ()

Protected Attributes inherited from P4::Util::Enumerator< T >
EnumeratorState	state = EnumeratorState::NotStarted

Static Protected Attributes inherited from P4::Util::Enumerator< T >
static std::vector< T >	emptyVector

Detailed Description

template<typename T>
class P4::Util::EmptyEnumerator< T >

Always empty iterator (equivalent to end())

Member Function Documentation

template<typename T>

T P4::Util::EmptyEnumerator< T >::getCurrent ( ) const

inlineoverridevirtual

Get current element in the collection.

template<typename T>

bool P4::Util::EmptyEnumerator< T >::moveNext ( )

inlineoverridevirtual

Always returns false.