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nlohmann::detail::iter_impl< BasicJsonType > Class Template Reference

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

Public Member Functions

 iter_impl ()=default
 default constructor More...
 
 iter_impl (pointer object) noexcept
 constructor for a given JSON instance More...
 
 iter_impl (const iter_impl< typename std::remove_const< BasicJsonType >::type > &other) noexcept
 converting constructor More...
 
iter_imploperator= (const iter_impl< typename std::remove_const< BasicJsonType >::type > &other) noexcept
 converting assignment More...
 
reference operator* () const
 return a reference to the value pointed to by the iterator More...
 
pointer operator-> () const
 dereference the iterator More...
 
iter_impl const operator++ (int)
 post-increment (it++) More...
 
iter_imploperator++ ()
 pre-increment (++it) More...
 
iter_impl const operator-- (int)
 post-decrement (it–) More...
 
iter_imploperator-- ()
 pre-decrement (–it) More...
 
bool operator== (const iter_impl &other) const
 comparison: equal More...
 
bool operator!= (const iter_impl &other) const
 comparison: not equal More...
 
bool operator< (const iter_impl &other) const
 comparison: smaller More...
 
bool operator<= (const iter_impl &other) const
 comparison: less than or equal More...
 
bool operator> (const iter_impl &other) const
 comparison: greater than More...
 
bool operator>= (const iter_impl &other) const
 comparison: greater than or equal More...
 
iter_imploperator+= (difference_type i)
 add to iterator More...
 
iter_imploperator-= (difference_type i)
 subtract from iterator More...
 
iter_impl operator+ (difference_type i) const
 add to iterator More...
 
iter_impl operator- (difference_type i) const
 subtract from iterator More...
 
difference_type operator- (const iter_impl &other) const
 return difference More...
 
reference operator[] (difference_type n) const
 access to successor More...
 
const object_t::key_type & key () const
 return the key of an object iterator More...
 
reference value () const
 return the value of an iterator More...
 

Private Types

using object_t = typename BasicJsonType::object_t
 
using array_t = typename BasicJsonType::array_t
 

Private Member Functions

void set_begin () noexcept
 set the iterator to the first value More...
 
void set_end () noexcept
 set the iterator past the last value More...
 

Private Attributes

friend BasicJsonType
 
friend iteration_proxy< iter_impl >
 
friend iteration_proxy_value< iter_impl >
 
pointer m_object = nullptr
 associated JSON instance More...
 
internal_iterator< typename std::remove_const< BasicJsonType >::type > m_it {}
 the actual iterator of the associated instance More...
 

Friends

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

Detailed Description

template<typename BasicJsonType>
class nlohmann::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 7707 of file json.hpp.

Member Typedef Documentation

◆ array_t

template<typename BasicJsonType >
using nlohmann::detail::iter_impl< BasicJsonType >::array_t = typename BasicJsonType::array_t
private

Definition at line 7716 of file json.hpp.

◆ difference_type

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

a type to represent differences between iterators

Definition at line 7733 of file json.hpp.

◆ iterator_category

template<typename BasicJsonType >
using nlohmann::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 7728 of file json.hpp.

◆ object_t

template<typename BasicJsonType >
using nlohmann::detail::iter_impl< BasicJsonType >::object_t = typename BasicJsonType::object_t
private

Definition at line 7715 of file json.hpp.

◆ pointer

template<typename BasicJsonType >
using nlohmann::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 7735 of file json.hpp.

◆ reference

template<typename BasicJsonType >
using nlohmann::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 7739 of file json.hpp.

◆ value_type

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

the type of the values when the iterator is dereferenced

Definition at line 7731 of file json.hpp.

Constructor & Destructor Documentation

◆ iter_impl() [1/3]

template<typename BasicJsonType >
iter_impl< typename std::conditional< std::is_const< BasicJsonType >::value, typename std::remove_const< BasicJsonType >::type, const BasicJsonType >::type > ( )
default

default constructor

allow basic_json to access private members

Definition at line 7710 of file json.hpp.

◆ iter_impl() [2/3]

template<typename BasicJsonType >
nlohmann::detail::iter_impl< BasicJsonType >::iter_impl ( pointer  object)
inlineexplicitnoexcept

constructor for a given JSON instance

Parameters
[in]objectpointer to a JSON object for this iterator
Precondition
object != nullptr
Postcondition
The iterator is initialized; i.e. m_object != nullptr.

Definition at line 7753 of file json.hpp.

◆ iter_impl() [3/3]

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

converting 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]othernon-const iterator to copy from
Note
It is not checked whether other is initialized.

Definition at line 7793 of file json.hpp.

Member Function Documentation

◆ key()

template<typename BasicJsonType >
const object_t::key_type & nlohmann::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 8252 of file json.hpp.

◆ operator!=()

template<typename BasicJsonType >
bool nlohmann::detail::iter_impl< BasicJsonType >::operator!= ( const iter_impl< BasicJsonType > &  other) const
inline

comparison: not equal

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

Definition at line 8066 of file json.hpp.

◆ operator*()

template<typename BasicJsonType >
reference nlohmann::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 7882 of file json.hpp.

◆ operator+()

template<typename BasicJsonType >
iter_impl nlohmann::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 8167 of file json.hpp.

◆ operator++() [1/2]

template<typename BasicJsonType >
iter_impl & nlohmann::detail::iter_impl< BasicJsonType >::operator++ ( )
inline

pre-increment (++it)

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

Definition at line 7964 of file json.hpp.

◆ operator++() [2/2]

template<typename BasicJsonType >
iter_impl const nlohmann::detail::iter_impl< BasicJsonType >::operator++ ( int  )
inline

post-increment (it++)

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

Definition at line 7953 of file json.hpp.

◆ operator+=()

template<typename BasicJsonType >
iter_impl & nlohmann::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 8129 of file json.hpp.

◆ operator-() [1/2]

template<typename BasicJsonType >
difference_type nlohmann::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 8200 of file json.hpp.

◆ operator-() [2/2]

template<typename BasicJsonType >
iter_impl nlohmann::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 8189 of file json.hpp.

◆ operator--() [1/2]

template<typename BasicJsonType >
iter_impl & nlohmann::detail::iter_impl< BasicJsonType >::operator-- ( )
inline

pre-decrement (–it)

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

Definition at line 8007 of file json.hpp.

◆ operator--() [2/2]

template<typename BasicJsonType >
iter_impl const nlohmann::detail::iter_impl< BasicJsonType >::operator-- ( int  )
inline

post-decrement (it–)

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

Definition at line 7996 of file json.hpp.

◆ operator-=()

template<typename BasicJsonType >
iter_impl & nlohmann::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 8158 of file json.hpp.

◆ operator->()

template<typename BasicJsonType >
pointer nlohmann::detail::iter_impl< BasicJsonType >::operator-> ( ) const
inline

dereference the iterator

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

Definition at line 7919 of file json.hpp.

◆ operator<()

template<typename BasicJsonType >
bool nlohmann::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 8075 of file json.hpp.

◆ operator<=()

template<typename BasicJsonType >
bool nlohmann::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 8102 of file json.hpp.

◆ operator=()

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

converting assignment

Parameters
[in,out]othernon-const iterator to copy from
Returns
const/non-const iterator
Note
It is not checked whether other is initialized.

Definition at line 7802 of file json.hpp.

◆ operator==()

template<typename BasicJsonType >
bool nlohmann::detail::iter_impl< BasicJsonType >::operator== ( const iter_impl< BasicJsonType > &  other) const
inline

comparison: equal

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

Definition at line 8039 of file json.hpp.

◆ operator>()

template<typename BasicJsonType >
bool nlohmann::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 8111 of file json.hpp.

◆ operator>=()

template<typename BasicJsonType >
bool nlohmann::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 8120 of file json.hpp.

◆ operator[]()

template<typename BasicJsonType >
reference nlohmann::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 8221 of file json.hpp.

◆ set_begin()

template<typename BasicJsonType >
void nlohmann::detail::iter_impl< BasicJsonType >::set_begin ( )
inlineprivatenoexcept

set the iterator to the first value

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

Definition at line 7814 of file json.hpp.

◆ set_end()

template<typename BasicJsonType >
void nlohmann::detail::iter_impl< BasicJsonType >::set_end ( )
inlineprivatenoexcept

set the iterator past the last value

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

Definition at line 7851 of file json.hpp.

◆ value()

template<typename BasicJsonType >
reference nlohmann::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 8268 of file json.hpp.

Friends And Related Function 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 8178 of file json.hpp.

Member Data Documentation

◆ BasicJsonType

template<typename BasicJsonType >
friend nlohmann::detail::iter_impl< BasicJsonType >::BasicJsonType
private

Definition at line 7711 of file json.hpp.

◆ iteration_proxy< iter_impl >

template<typename BasicJsonType >
friend nlohmann::detail::iter_impl< BasicJsonType >::iteration_proxy< iter_impl >
private

Definition at line 7712 of file json.hpp.

◆ iteration_proxy_value< iter_impl >

template<typename BasicJsonType >
friend nlohmann::detail::iter_impl< BasicJsonType >::iteration_proxy_value< iter_impl >
private

Definition at line 7713 of file json.hpp.

◆ m_it

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

the actual iterator of the associated instance

Definition at line 8277 of file json.hpp.

◆ m_object

template<typename BasicJsonType >
pointer nlohmann::detail::iter_impl< BasicJsonType >::m_object = nullptr
private

associated JSON instance

Definition at line 8275 of file json.hpp.


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