nlohmann::basic_json::crend¶

const_reverse_iteratorcrend()constnoexcept;

Returns an iterator to the reverse-end; that is, one before the first element. This element acts as a placeholder, attempting to access it results in undefined behavior.

Illustration from cppreference.com

Return value¶

reverse iterator to the element following the last element

Exception safety¶

No-throw guarantee: this member function never throws exceptions.

Complexity¶

Constant.

Examples¶

Example

The following code shows an example for crend().

#include<iostream>
#include<nlohmann/json.hpp>
usingjson=nlohmann::json;
intmain()
{
// create an array value
jsonarray={1,2,3,4,5};
// get an iterator to the reverse-end
json::const_reverse_iteratorit=array.crend();
// increment the iterator to point to the first element
--it;
// serialize the element that the iterator points to
std::cout<<*it<<'\n';
}

Output:

Version history¶

Added in version 1.0.0.