json/api/basic_json/crbegin.md

nlohmann::basic_json::crbegin

const_reverse_iterator crbegin() const noexcept;

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

`crbegin()` points to the last element, like `rbegin()`, and `rend()` to the position before the first element. The upper row is the reversed sequence and the lower row the forward sequence; dashed arrows link each reverse iterator to the forward iterator it stores, and dashed cells are past-the-last positions.

Return value

reverse iterator to 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 `crbegin()`.

```cpp
#include <iostream>
#include <nlohmann/json.hpp>

using nlohmann::json;

int main()
{
    // create an array value
    json array = {1, 2, 3, 4, 5};

    // get an iterator to the reverse-beginning
    json::const_reverse_iterator it = array.crbegin();

    // serialize the element that the iterator points to
    std::cout << *it << '\n';
}

```

Output:

```json
5

```

See also

• crend - returns a const reverse iterator to one before the first element
• rbegin - returns a reverse iterator to the last element
• cbegin - returns a const iterator to the first element
• Iterators - the article on iterators

Version history

• Added in version 1.0.0.