nlohmann::basic_json::as_base_class

json_base_class_t& as_base_class() noexcept;
const json_base_class_t& as_base_class() const noexcept;

Returns a reference to this object as its custom base class json_base_class_t. No copy is made.

Since basic_json derives from json_base_class_t, a member of basic_json hides any member of the custom base class with the same name. This function makes such hidden members accessible again.

Return value

reference to this object as json_base_class_t

Exception safety

No-throw guarantee: this function never throws exceptions.

Complexity

Constant.

Notes

The function is equivalent to static_cast<json_base_class_t&>(j) (or static_cast<const json_base_class_t&>(j)).

Examples

??? example

The example shows how to use `as_base_class` to access members of the custom base class that are hidden by members
of `basic_json`.

```cpp
--8<-- "examples/as_base_class.cpp"
```

Output:

```json
--8<-- "examples/as_base_class.output"
```

Version history

Added in version 3.13.0.

1.2 KiB Raw Blame History