google::cloud::spanner::v0::TupleStreamIterator< Tuple > Class Template Reference

A TupleStreamIterator<Tuple> is an "Input Iterator" that wraps a RowStreamIterator, parsing its elements into a sequence of StatusOr<Tuple> objects. More...

#include <google/cloud/spanner/row.h>

Public Types
Iterator type aliases
using	iterator_category = std::input_iterator_tag
using	value_type = StatusOr< Tuple >
using	difference_type = std::ptrdiff_t
using	pointer = value_type *
using	reference = value_type &
using	const_pointer = value_type const *
using	const_reference = value_type const &

Public Member Functions
	TupleStreamIterator ()=default
	Default constructs an "end" iterator. More...
	TupleStreamIterator (RowStreamIterator begin, RowStreamIterator end)
	Creates an iterator that wraps the given RowStreamIterator range. More...
reference	operator* ()
pointer	operator-> ()
const_reference	operator* () const
const_pointer	operator-> () const
TupleStreamIterator &	operator++ ()
TupleStreamIterator	operator++ (int)

Friends
bool	operator== (TupleStreamIterator const &a, TupleStreamIterator const &b)
bool	operator!= (TupleStreamIterator const &a, TupleStreamIterator const &b)

Detailed Description

template<typename Tuple>
class google::cloud::spanner::v0::TupleStreamIterator< Tuple >

A TupleStreamIterator<Tuple> is an "Input Iterator" that wraps a RowStreamIterator, parsing its elements into a sequence of StatusOr<Tuple> objects.

As an Input Iterator, the sequence may only be consumed once. See https://en.cppreference.com/w/cpp/named_req/InputIterator for more details.

Default constructing this object creates an instance that represents "end".

Each Row returned by the wrapped RowStreamIterator must be convertible to the specified Tuple template parameter.

Note

The term "stream" in this name refers to the general nature of the the data source, and is not intended to suggest any similarity to C++'s I/O streams library. Syntactically, this class is an "iterator".

Template Parameters

Tuple

the std::tuple<...> to parse each Row into.

Definition at line 309 of file row.h.

Member Typedef Documentation

const_pointer

template<typename Tuple >

using google::cloud::spanner::v0::TupleStreamIterator< Tuple >::const_pointer = value_type const*

Definition at line 318 of file row.h.

const_reference

template<typename Tuple >

using google::cloud::spanner::v0::TupleStreamIterator< Tuple >::const_reference = value_type const&

Definition at line 319 of file row.h.

difference_type

template<typename Tuple >

using google::cloud::spanner::v0::TupleStreamIterator< Tuple >::difference_type = std::ptrdiff_t

Definition at line 315 of file row.h.

iterator_category

template<typename Tuple >

using google::cloud::spanner::v0::TupleStreamIterator< Tuple >::iterator_category = std::input_iterator_tag

Definition at line 313 of file row.h.

pointer

template<typename Tuple >

using google::cloud::spanner::v0::TupleStreamIterator< Tuple >::pointer = value_type*

Definition at line 316 of file row.h.

reference

template<typename Tuple >

using google::cloud::spanner::v0::TupleStreamIterator< Tuple >::reference = value_type&

Definition at line 317 of file row.h.

value_type

template<typename Tuple >

using google::cloud::spanner::v0::TupleStreamIterator< Tuple >::value_type = StatusOr<Tuple>

Definition at line 314 of file row.h.

Constructor & Destructor Documentation

TupleStreamIterator() [1/2]

template<typename Tuple >

google::cloud::spanner::v0::TupleStreamIterator< Tuple >::TupleStreamIterator ( )

default

Default constructs an "end" iterator.

TupleStreamIterator() [2/2]

template<typename Tuple >

google::cloud::spanner::v0::TupleStreamIterator< Tuple >::TupleStreamIterator ( RowStreamIterator  begin, RowStreamIterator  end  )

inline

Creates an iterator that wraps the given RowStreamIterator range.

Definition at line 326 of file row.h.

Member Function Documentation

operator*() [1/2]

template<typename Tuple >

reference google::cloud::spanner::v0::TupleStreamIterator< Tuple >::operator* ( )

inline

Definition at line 331 of file row.h.

operator*() [2/2]

template<typename Tuple >

const_reference google::cloud::spanner::v0::TupleStreamIterator< Tuple >::operator* ( ) const

inline

Definition at line 334 of file row.h.

operator++() [1/2]

template<typename Tuple >

TupleStreamIterator& google::cloud::spanner::v0::TupleStreamIterator< Tuple >::operator++ ( )

inline

Definition at line 337 of file row.h.

operator++() [2/2]

template<typename Tuple >

TupleStreamIterator google::cloud::spanner::v0::TupleStreamIterator< Tuple >::operator++ ( int  )

inline

Definition at line 347 of file row.h.

operator->() [1/2]

template<typename Tuple >

pointer google::cloud::spanner::v0::TupleStreamIterator< Tuple >::operator-> ( )

inline

Definition at line 332 of file row.h.

operator->() [2/2]

template<typename Tuple >

const_pointer google::cloud::spanner::v0::TupleStreamIterator< Tuple >::operator-> ( ) const

inline

Definition at line 335 of file row.h.

Friends And Related Function Documentation

operator!=

template<typename Tuple >

bool operator!= ( TupleStreamIterator< Tuple > const &  a, TupleStreamIterator< Tuple > const &  b  )

friend

Definition at line 358 of file row.h.

operator==

template<typename Tuple >

bool operator== ( TupleStreamIterator< Tuple > const &  a, TupleStreamIterator< Tuple > const &  b  )

friend

Definition at line 353 of file row.h.