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### jsoncons::basic_json::emplace_back
```cpp
template <typename... Args>
json& emplace_back(Args&&... args);
```
#### Parameters
args
Arguments to forward to the constructor of the json value
#### Return value
A reference to the emplaced json value.
#### Exceptions
Throws `std::domain_error` if not a json array.
### Example
```cpp
json arr(json_array_arg);
arr.emplace_back(10);
arr.emplace_back(20);
arr.emplace_back(30);
std::cout << arr << '\n';
```
Output:
```json
[10,20,30]
```
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