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api/basic_json/json_base_class_t/index.html
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api/basic_json/json_base_class_t/index.md
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@@ -20,6 +20,14 @@ The default value for `CustomBaseClass` is `void`. In this case, an [empty base
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).
#### Name conflicts
Since `basic_json` derives from `CustomBaseClass`, members of `basic_json` hide members of `CustomBaseClass` with the same name. Hidden members remain accessible via [`as_base_class`](https://json.nlohmann.me/api/basic_json/as_base_class/index.md) or by casting the value to `json_base_class_t`.
Avoid generic member names
Future versions of the library may add members to `basic_json` that hide members of `CustomBaseClass` that are accessible today. To reduce the risk of such conflicts, avoid generic names for the members of `CustomBaseClass`, for instance by using a distinctive prefix.
## Examples
Example
@@ -128,8 +136,10 @@ Output:
## See also
- [as_base_class](https://json.nlohmann.me/api/basic_json/as_base_class/index.md) - access the custom base class
- [Template Parameter Requirements](https://json.nlohmann.me/features/types/template_parameters/#custombaseclass) - the requirements for `CustomBaseClass`
## Version history
- Added in version 3.12.0.
- Made a public member type in version 3.13.0 unreleased; it was private before, so it could not be named outside the class.