JSON for Modern C++  3.7.0

◆ rbegin() [1/2]

template<template< typename U, typename V, typename... Args > class ObjectType = std::map, template< typename U, typename... Args > class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator, template< typename T, typename SFINAE=void > class JSONSerializer = adl_serializer>
reverse_iterator nlohmann::basic_json::rbegin ( )

Returns an iterator to the reverse-beginning; that is, the last element.

Illustration from cppreference.com
This function helps basic_json satisfying the ReversibleContainer requirements:
  • The complexity is constant.
  • Has the semantics of reverse_iterator(end()).
The following code shows an example for rbegin().
1 #include <iostream>
2 #include <nlohmann/json.hpp>
4 using json = nlohmann::json;
6 int main()
7 {
8  // create an array value
9  json array = {1, 2, 3, 4, 5};
11  // get an iterator to the reverse-beginning
14  // serialize the element that the iterator points to
15  std::cout << *it << '\n';
16 }
basic_json<> json
default JSON class
Definition: json.hpp:2355
static basic_json array(initializer_list_t init={})
explicitly create an array from an initializer list
Definition: json.hpp:15905
reverse_iterator rbegin() noexcept
returns an iterator to the reverse-beginning
Definition: json.hpp:18641
json_reverse_iterator< typename basic_json::iterator > reverse_iterator
a reverse iterator for a basic_json container
Definition: json.hpp:14687

Output (play with this example online):
The example code above can be translated with
g++ -std=c++11 -Isingle_include doc/examples/rbegin.cpp -o rbegin 
See also
crbegin() – returns a const reverse iterator to the beginning
rend() – returns a reverse iterator to the end
crend() – returns a const reverse iterator to the end
version 1.0.0

Definition at line 18641 of file json.hpp.