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nlohmann
46 lines
1.1 KiB
Markdown
46 lines
1.1 KiB
Markdown
# <small>nlohmann::basic_json::</small>json_base_class_t
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```cpp
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using json_base_class_t = detail::json_base_class<CustomBaseClass>;
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```
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The base class used to inject custom functionality into each instance of `basic_json`.
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Examples of such functionality might be metadata, additional member functions (e.g., visitors), or other application-specific code.
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## Template parameters
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`CustomBaseClass`
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: the base class to be added to `basic_json`
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## Notes
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#### Default type
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The default value for `CustomBaseClass` is `void`. In this case, an
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[empty base class](https://en.cppreference.com/w/cpp/language/ebo) is used and no additional functionality is injected.
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#### Limitations
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The type `CustomBaseClass` has to be a default-constructible class.
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`basic_json` only supports copy/move construction/assignment if `CustomBaseClass` does so as well.
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## Examples
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??? example
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The following code shows how to inject custom data and methods for each node.
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```cpp
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--8<-- "examples/json_base_class_t.cpp"
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```
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Output:
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```json
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--8<-- "examples/json_base_class_t.output"
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```
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## Version history
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- Added in version 3.12.0.
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