a template for a bidirectional iterator for the basic_json class This class implements a both iterators (iterator and const_iterator) for the basic_json class. More...

#include <json.hpp>

Public Types
using	iterator_category = std::bidirectional_iterator_tag

using	value_type = typename BasicJsonType::value_type
	the type of the values when the iterator is dereferenced

using	difference_type = typename BasicJsonType::difference_type
	a type to represent differences between iterators

using	pointer = typename std::conditional< std::is_const< BasicJsonType >::value, typename BasicJsonType::const_pointer, typename BasicJsonType::pointer >::type
	defines a pointer to the type iterated over (value_type)

using	reference = typename std::conditional< std::is_const< BasicJsonType >::value, typename BasicJsonType::const_reference, typename BasicJsonType::reference >::type
	defines a reference to the type iterated over (value_type)

Public Member Functions
	iter_impl ()=default

	~iter_impl ()=default

	iter_impl (iter_impl &&) noexcept=default

iter_impl &	operator= (iter_impl &&) noexcept=default

	iter_impl (pointer object) noexcept
	constructor for a given JSON instance

	iter_impl (const iter_impl< const BasicJsonType > &other) noexcept
	const copy constructor

iter_impl &	operator= (const iter_impl< const BasicJsonType > &other) noexcept
	converting assignment

	iter_impl (const iter_impl< typename std::remove_const< BasicJsonType >::type > &other) noexcept
	converting constructor

iter_impl &	operator= (const iter_impl< typename std::remove_const< BasicJsonType >::type > &other) noexcept
	converting assignment

	switch (m_object->m_data.m_type)

void	set_end () noexcept
	set the iterator past the last value

reference	operator* () const
	return a reference to the value pointed to by the iterator

pointer	operator-> () const
	dereference the iterator

iter_impl	operator++ (int) &
	post-increment (it++)

iter_impl &	operator++ ()
	pre-increment (++it)

iter_impl	operator-- (int) &
	post-decrement (it–)

iter_impl &	operator-- ()
	pre-decrement (–it)

template<typename IterImpl , detail::enable_if_t<(std::is_same< IterImpl, iter_impl >::value\|\|std::is_same< IterImpl, other_iter_impl >::value), std::nullptr_t > = nullptr>
bool	operator== (const IterImpl &other) const
	comparison: equal

template<typename IterImpl , detail::enable_if_t<(std::is_same< IterImpl, iter_impl >::value\|\|std::is_same< IterImpl, other_iter_impl >::value), std::nullptr_t > = nullptr>
bool	operator!= (const IterImpl &other) const
	comparison: not equal

bool	operator< (const iter_impl &other) const
	comparison: smaller

bool	operator<= (const iter_impl &other) const
	comparison: less than or equal

bool	operator> (const iter_impl &other) const
	comparison: greater than

bool	operator>= (const iter_impl &other) const
	comparison: greater than or equal

iter_impl &	operator+= (difference_type i)
	add to iterator

iter_impl &	operator-= (difference_type i)
	subtract from iterator

iter_impl	operator+ (difference_type i) const
	add to iterator

iter_impl	operator- (difference_type i) const
	subtract from iterator

difference_type	operator- (const iter_impl &other) const
	return difference

reference	operator[] (difference_type n) const
	access to successor

const object_t::key_type &	key () const
	return the key of an object iterator

reference	value () const
	return the value of an iterator

Public Attributes
JSON_PRIVATE_UNLESS_TESTED	: void set_begin() noexcept { JSON_ASSERT(m_object != nullptr)

JSON_PRIVATE_UNLESS_TESTED	: pointer m_object = nullptr

internal_iterator< typename std::remove_const< BasicJsonType >::type >	m_it {}
	the actual iterator of the associated instance

Friends
iter_impl	operator+ (difference_type i, const iter_impl &it)
	addition of distance and iterator

Detailed Description

template<typename BasicJsonType>
class detail::iter_impl< BasicJsonType >

a template for a bidirectional iterator for the basic_json class This class implements a both iterators (iterator and const_iterator) for the basic_json class.

Note

An iterator is called initialized when a pointer to a JSON value has been set (e.g., by a constructor or a copy assignment). If the iterator is default-constructed, it is uninitialized and most methods are undefined. The library uses assertions to detect calls on uninitialized iterators.** @requirement The class satisfies the following concept requirements:

BidirectionalIterator: The iterator that can be moved can be moved in both directions (i.e. incremented and decremented).

Since: version 1.0.0, simplified in version 2.0.9, change to bidirectional iterators in version 3.0.0 (see https://github.com/nlohmann/json/issues/593)

Definition at line 12837 of file json.hpp.

Member Typedef Documentation

◆ difference_type

template<typename BasicJsonType >

using detail::iter_impl< BasicJsonType >::difference_type = typename BasicJsonType::difference_type

a type to represent differences between iterators

Definition at line 12868 of file json.hpp.

◆ iterator_category

template<typename BasicJsonType >

using detail::iter_impl< BasicJsonType >::iterator_category = std::bidirectional_iterator_tag

The std::iterator class template (used as a base class to provide typedefs) is deprecated in C++17. The C++ Standard has never required user-defined iterators to derive from std::iterator. A user-defined iterator should provide publicly accessible typedefs named iterator_category, value_type, difference_type, pointer, and reference. Note that value_type is required to be non-const, even for constant iterators.

Definition at line 12863 of file json.hpp.

◆ pointer

template<typename BasicJsonType >

using detail::iter_impl< BasicJsonType >::pointer = typename std::conditional<std::is_const<BasicJsonType>::value, typename BasicJsonType::const_pointer, typename BasicJsonType::pointer>::type

defines a pointer to the type iterated over (value_type)

Definition at line 12870 of file json.hpp.

◆ reference

template<typename BasicJsonType >

using detail::iter_impl< BasicJsonType >::reference = typename std::conditional<std::is_const<BasicJsonType>::value, typename BasicJsonType::const_reference, typename BasicJsonType::reference>::type

defines a reference to the type iterated over (value_type)

Definition at line 12874 of file json.hpp.

◆ value_type

template<typename BasicJsonType >

using detail::iter_impl< BasicJsonType >::value_type = typename BasicJsonType::value_type

the type of the values when the iterator is dereferenced

Definition at line 12866 of file json.hpp.

Constructor & Destructor Documentation

◆ iter_impl() [1/5]

template<typename BasicJsonType >

detail::iter_impl< BasicJsonType >::iter_impl ( )

default

◆ ~iter_impl()

template<typename BasicJsonType >

detail::iter_impl< BasicJsonType >::~iter_impl ( )

default

◆ iter_impl() [2/5]

template<typename BasicJsonType >

detail::iter_impl< BasicJsonType >::iter_impl ( iter_impl< BasicJsonType > && )

defaultnoexcept

◆ iter_impl() [3/5]

template<typename BasicJsonType >

detail::iter_impl< BasicJsonType >::iter_impl ( pointer object )

inlineexplicitnoexcept

constructor for a given JSON instance

Parameters

[in] object pointer to a JSON object for this iterator

Precondition: object != nullptr

Postcondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 12890 of file json.hpp.

◆ iter_impl() [4/5]

template<typename BasicJsonType >

detail::iter_impl< BasicJsonType >::iter_impl ( const iter_impl< const BasicJsonType > & other )

inlinenoexcept

const copy constructor

Note: The conventional copy constructor and copy assignment are implicitly defined. Combined with the following converting constructor and assignment, they support: (1) copy from iterator to iterator, (2) copy from const iterator to const iterator, and (3) conversion from iterator to const iterator. However conversion from const iterator to iterator is not defined.

Parameters

[in] other const iterator to copy from

Note: This copy constructor had to be defined explicitly to circumvent a bug occurring on msvc v19.0 compiler (VS 2015) debug build. For more information refer to: https://github.com/nlohmann/json/issues/1608

Definition at line 12940 of file json.hpp.

◆ iter_impl() [5/5]

template<typename BasicJsonType >

detail::iter_impl< BasicJsonType >::iter_impl ( const iter_impl< typename std::remove_const< BasicJsonType >::type > & other )

inlinenoexcept

converting constructor

Parameters

[in] other non-const iterator to copy from

Note: It is not checked whether other is initialized.

Definition at line 12965 of file json.hpp.

Member Function Documentation

◆ key()

template<typename BasicJsonType >

const object_t::key_type & detail::iter_impl< BasicJsonType >::key ( ) const

inline

return the key of an object iterator

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13512 of file json.hpp.

◆ operator!=()

template<typename BasicJsonType >

template<typename IterImpl , detail::enable_if_t<(std::is_same< IterImpl, iter_impl >::value||std::is_same< IterImpl, other_iter_impl >::value), std::nullptr_t > = nullptr>

bool detail::iter_impl< BasicJsonType >::operator!= ( const IterImpl & other ) const

inline

comparison: not equal

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13295 of file json.hpp.

◆ operator*()

template<typename BasicJsonType >

reference detail::iter_impl< BasicJsonType >::operator* ( ) const

inline

return a reference to the value pointed to by the iterator

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13070 of file json.hpp.

◆ operator+()

template<typename BasicJsonType >

iter_impl detail::iter_impl< BasicJsonType >::operator+ ( difference_type i ) const

inline

add to iterator

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13412 of file json.hpp.

◆ operator++() [1/2]

template<typename BasicJsonType >

iter_impl & detail::iter_impl< BasicJsonType >::operator++ ( )

inline

pre-increment (++it)

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13167 of file json.hpp.

◆ operator++() [2/2]

template<typename BasicJsonType >

iter_impl detail::iter_impl< BasicJsonType >::operator++ ( int ) &

inline

post-increment (it++)

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13156 of file json.hpp.

◆ operator+=()

template<typename BasicJsonType >

iter_impl & detail::iter_impl< BasicJsonType >::operator+= ( difference_type i )

inline

add to iterator

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13366 of file json.hpp.

◆ operator-() [1/2]

template<typename BasicJsonType >

difference_type detail::iter_impl< BasicJsonType >::operator- ( const iter_impl< BasicJsonType > & other ) const

inline

return difference

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13445 of file json.hpp.

◆ operator-() [2/2]

template<typename BasicJsonType >

iter_impl detail::iter_impl< BasicJsonType >::operator- ( difference_type i ) const

inline

subtract from iterator

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13434 of file json.hpp.

◆ operator--() [1/2]

template<typename BasicJsonType >

iter_impl & detail::iter_impl< BasicJsonType >::operator-- ( )

inline

pre-decrement (–it)

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13218 of file json.hpp.

◆ operator--() [2/2]

template<typename BasicJsonType >

iter_impl detail::iter_impl< BasicJsonType >::operator-- ( int ) &

inline

post-decrement (it–)

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13207 of file json.hpp.

◆ operator-=()

template<typename BasicJsonType >

iter_impl & detail::iter_impl< BasicJsonType >::operator-= ( difference_type i )

inline

subtract from iterator

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13403 of file json.hpp.

◆ operator->()

template<typename BasicJsonType >

pointer detail::iter_impl< BasicJsonType >::operator-> ( ) const

inline

dereference the iterator

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13114 of file json.hpp.

◆ operator<()

template<typename BasicJsonType >

bool detail::iter_impl< BasicJsonType >::operator< ( const iter_impl< BasicJsonType > & other ) const

inline

comparison: smaller

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13304 of file json.hpp.

◆ operator<=()

template<typename BasicJsonType >

bool detail::iter_impl< BasicJsonType >::operator<= ( const iter_impl< BasicJsonType > & other ) const

inline

comparison: less than or equal

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13339 of file json.hpp.

◆ operator=() [1/3]

template<typename BasicJsonType >

iter_impl & detail::iter_impl< BasicJsonType >::operator= ( const iter_impl< const BasicJsonType > & other )

inlinenoexcept

converting assignment

Parameters

[in] other const iterator to copy from

Returns: const/non-const iterator

Note: It is not checked whether other is initialized.

Definition at line 12950 of file json.hpp.

◆ operator=() [2/3]

template<typename BasicJsonType >

iter_impl & detail::iter_impl< BasicJsonType >::operator= ( const iter_impl< typename std::remove_const< BasicJsonType >::type > & other )

inlinenoexcept

converting assignment

Parameters

[in] other non-const iterator to copy from

Returns: const/non-const iterator

Note: It is not checked whether other is initialized.

Definition at line 12975 of file json.hpp.

◆ operator=() [3/3]

template<typename BasicJsonType >

iter_impl & detail::iter_impl< BasicJsonType >::operator= ( iter_impl< BasicJsonType > && )

defaultnoexcept

◆ operator==()

template<typename BasicJsonType >

template<typename IterImpl , detail::enable_if_t<(std::is_same< IterImpl, iter_impl >::value||std::is_same< IterImpl, other_iter_impl >::value), std::nullptr_t > = nullptr>

bool detail::iter_impl< BasicJsonType >::operator== ( const IterImpl & other ) const

inline

comparison: equal

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13259 of file json.hpp.

◆ operator>()

template<typename BasicJsonType >

bool detail::iter_impl< BasicJsonType >::operator> ( const iter_impl< BasicJsonType > & other ) const

inline

comparison: greater than

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13348 of file json.hpp.

◆ operator>=()

template<typename BasicJsonType >

bool detail::iter_impl< BasicJsonType >::operator>= ( const iter_impl< BasicJsonType > & other ) const

inline

comparison: greater than or equal

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13357 of file json.hpp.

◆ operator[]()

template<typename BasicJsonType >

reference detail::iter_impl< BasicJsonType >::operator[] ( difference_type n ) const

inline

access to successor

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13474 of file json.hpp.

◆ set_end()

template<typename BasicJsonType >

void detail::iter_impl< BasicJsonType >::set_end ( )

inlinenoexcept

set the iterator past the last value

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13031 of file json.hpp.

◆ switch()

template<typename BasicJsonType >

detail::iter_impl< BasicJsonType >::switch ( m_object->m_data. m_type )

inline

Definition at line 12991 of file json.hpp.

◆ value()

template<typename BasicJsonType >

reference detail::iter_impl< BasicJsonType >::value ( ) const

inline

return the value of an iterator

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13528 of file json.hpp.

Friends And Related Symbol Documentation

◆ operator+

template<typename BasicJsonType >

iter_impl operator+	(	difference_type	i,
		const iter_impl< BasicJsonType > &	it
	)

friend

addition of distance and iterator

Precondition: The iterator is initialized; i.e. m_object != nullptr.

Definition at line 13423 of file json.hpp.

Member Data Documentation

◆ pad0

template<typename BasicJsonType >

JSON_PRIVATE_UNLESS_TESTED detail::iter_impl< BasicJsonType >::__pad0__

Definition at line 12982 of file json.hpp.

◆ pad1

template<typename BasicJsonType >

JSON_PRIVATE_UNLESS_TESTED detail::iter_impl< BasicJsonType >::__pad1__

Definition at line 13533 of file json.hpp.

◆ m_it

template<typename BasicJsonType >

internal_iterator<typename std::remove_const<BasicJsonType>::type> detail::iter_impl< BasicJsonType >::m_it {}

the actual iterator of the associated instance

Definition at line 13537 of file json.hpp.

The documentation for this class was generated from the following file:

include/nlohmann/json.hpp

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Public Types

Public Member Functions

Public Attributes

Friends

Detailed Description

Member Typedef Documentation

◆ difference_type

◆ iterator_category

◆ pointer

◆ reference

◆ value_type

Constructor & Destructor Documentation

◆ iter_impl() [1/5]

◆ ~iter_impl()

◆ iter_impl() [2/5]

◆ iter_impl() [3/5]

◆ iter_impl() [4/5]

◆ iter_impl() [5/5]

Member Function Documentation

◆ key()

◆ operator!=()

◆ operator*()

◆ operator+()

◆ operator++() [1/2]

◆ operator++() [2/2]

◆ operator+=()

◆ operator-() [1/2]

◆ operator-() [2/2]

◆ operator--() [1/2]

◆ operator--() [2/2]

◆ operator-=()

◆ operator->()

◆ operator<()

◆ operator<=()

◆ operator=() [1/3]

◆ operator=() [2/3]

◆ operator=() [3/3]

◆ operator==()

◆ operator>()

◆ operator>=()

◆ operator[]()

◆ set_end()

◆ switch()

◆ value()

Friends And Related Symbol Documentation

◆ operator+

Member Data Documentation

◆ __pad0__

◆ __pad1__

◆ m_it

◆ pad0

◆ pad1