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
	defines a pointer to the type iterated over (value_type)

using	reference
	defines a reference to the type iterated over (value_type)

Public Member Functions
	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

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)

Member Typedef Documentation

◆ 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.

◆ pointer

template<typename BasicJsonType >

using detail::iter_impl< BasicJsonType >::pointer

Initial value:

 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)

◆ reference

template<typename BasicJsonType >

using detail::iter_impl< BasicJsonType >::reference

Initial value:

 
        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)

Constructor & Destructor Documentation

◆ iter_impl() [1/3]

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.

◆ iter_impl() [2/3]

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

◆ iter_impl() [3/3]

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.

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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ operator=() [1/2]

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.

◆ operator=() [2/2]

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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

Public Types

Public Member Functions

Public Attributes

Detailed Description

Member Typedef Documentation

◆ iterator_category

◆ pointer

◆ reference

Constructor & Destructor Documentation

◆ iter_impl() [1/3]

◆ iter_impl() [2/3]

◆ iter_impl() [3/3]

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=() [1/2]

◆ operator=() [2/2]

◆ operator==()

◆ operator>()

◆ operator>=()

◆ operator[]()

◆ set_end()

◆ value()