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2026-10-03 05:43:12 +00:00
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api/basic_json/json_base_class_t/index.md
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@@ -12,11 +12,11 @@ The base class used to inject custom functionality into each instance of `basic_
## Notes
#### Default type
### Default type
The default value for `CustomBaseClass` is `void`. In this case, an [empty base class](https://en.cppreference.com/w/cpp/language/ebo) is used and no additional functionality is injected.
#### Limitations
### Limitations
The type `CustomBaseClass` has to be a default-constructible, non-`final` class. `basic_json` only supports copy/move construction/assignment if `CustomBaseClass` does so as well. A `CustomBaseClass` with non-static data members forfeits `basic_json`'s [standard layout](https://en.cppreference.com/w/cpp/named_req/StandardLayoutType) guarantee. See [Template Parameter Requirements](https://json.nlohmann.me/features/types/template_parameters/#custombaseclass).
@@ -126,6 +126,10 @@ Output:
/object/uint - metadata = 42 -> 1
```
## See also
- [Template Parameter Requirements](https://json.nlohmann.me/features/types/template_parameters/#custombaseclass) - the requirements for `CustomBaseClass`
## Version history
- Added in version 3.12.0.