JSON for Modern C++  2.0.6

§ 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>
reverse_iterator nlohmann::basic_json::rbegin ( )
inlinenoexcept

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

range-rbegin-rend.svg
Illustration from cppreference.com
Complexity
Constant.
Requirements
This function helps basic_json satisfying the ReversibleContainer requirements:
  • The complexity is constant.
  • Has the semantics of reverse_iterator(end()).
Example
The following code shows an example for rbegin().
1 #include <json.hpp>
2 
3 using json = nlohmann::json;
4 
5 int main()
6 {
7  // create an array value
8  json array = {1, 2, 3, 4, 5};
9 
10  // get an iterator to the reverse-beginning
11  json::reverse_iterator it = array.rbegin();
12 
13  // serialize the element that the iterator points to
14  std::cout << *it << '\n';
15 }
basic_json<> json
default JSON class
Definition: json.hpp:10155
json_reverse_iterator< typename basic_json::iterator > reverse_iterator
a reverse iterator for a basic_json container
Definition: json.hpp:283
Output (play with this example online):
5
The example code above can be translated with
g++ -std=c++11 -Isrc 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
Since
version 1.0.0

Definition at line 4442 of file json.hpp.