65 lines
1.6 KiB
Markdown
65 lines
1.6 KiB
Markdown
# nlohmann::basic_json::rbegin
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```
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reverse_iterator rbegin() noexcept;
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const_reverse_iterator rbegin() const noexcept;
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```
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Returns an iterator to the reverse-beginning; that is, the last element.
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`rbegin()` points to the last element 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.
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## Return value
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reverse iterator to the last element
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## Exception safety
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No-throw guarantee: this member function never throws exceptions.
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## Complexity
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Constant.
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## Examples
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Example
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The following code shows an example for `rbegin()`.
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```
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#include <iostream>
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#include <nlohmann/json.hpp>
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using nlohmann::json;
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int main()
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{
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// create an array value
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json array = {1, 2, 3, 4, 5};
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// get an iterator to the reverse-beginning
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json::reverse_iterator it = array.rbegin();
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// serialize the element that the iterator points to
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std::cout << *it << '\n';
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}
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```
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Output:
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```
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5
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```
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## See also
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- [`rend`](https://json.nlohmann.me/api/basic_json/rend/index.md) - returns a reverse iterator to one before the first element
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- [`crbegin`](https://json.nlohmann.me/api/basic_json/crbegin/index.md) - returns a const reverse iterator to the last element
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- [`begin`](https://json.nlohmann.me/api/basic_json/begin/index.md) - returns an iterator to the first element
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- [Iterators](https://json.nlohmann.me/features/iterators/index.md) - the article on iterators
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## Version history
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- Added in version 1.0.0.
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