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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
 
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_imploperator= (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_imploperator= (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_imploperator= (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_imploperator++ ()
 pre-increment (++it)
 
iter_impl operator-- (int) &
 post-decrement (it–)
 
iter_imploperator-- ()
 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_imploperator+= (difference_type i)
 add to iterator
 
iter_imploperator-= (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]objectpointer 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]otherconst 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]othernon-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]otherconst 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]othernon-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: