JSON for Modern C++  3.0
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 = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
const_reverse_iterator nlohmann::basic_json::crend ( ) const
inlinenoexcept

Returns a const reverse iterator to the reverse-end; that is, one before the first element.

range-rbegin-rend.svg
Illustration from cppreference.com
Complexity
Constant.
Requirements
This function satisfies the ReversibleContainer requirements:
  • The complexity is constant.
  • Has the semantics of const_cast<const basic_json&>(*this).rend().
Example
The following code shows an example for crend.
1 #include <json.hpp>
2 
3 using namespace nlohmann;
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-end
12 
13  // increment the iterator to point to the first element
14  --it;
15 
16  // serialize the element that the iterator points to
17  std::cout << *it << '\n';
18 }
a class to store JSON values
Definition: json.hpp:121
const_reverse_iterator crend() const noexcept
returns a const reverse iterator to one before the first
Definition: json.hpp:2863
a const reverse random access iterator for the basic_json class
Definition: json.hpp:5014
namespace for Niels Lohmann
Definition: json.hpp:56
Output:
1
The example code above can be translated with
g++ -std=c++11 -Isrc doc/examples/crend.cpp -o crend 
.