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2026-10-03 05:43:12 +00:00
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api/basic_json/contains/index.md
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@@ -56,6 +56,14 @@ Postconditions
If `j.contains(x)` returns `true` for a key or JSON pointer `x`, then it is safe to call `j[x]`.
Deprecation
Overload (3) also accepts a [`json_pointer`](https://json.nlohmann.me/api/json_pointer/index.md) whose template argument is a `basic_json` specialization (e.g., `nlohmann::json_pointer<nlohmann::json>`) instead of a string type. This is deprecated since version 3.11.0 and will be removed in a future major version; use `basic_json::json_pointer` (for `json`, `nlohmann::json_pointer<std::string>`) instead.
You should be warned by your compiler with a `-Wdeprecated-declarations` warning if you are using a deprecated function.
See the [migration guide](https://json.nlohmann.me/integration/migration_guide/#json-pointers) for how to update existing code.
## Examples
Example: (1) check with key
@@ -198,4 +206,4 @@ false
1. Added in version 3.11.0.
1. Added in version 3.6.0. Extended template `KeyType` to support comparable types in version 3.11.0.
1. Added in version 3.7.0.
1. Deleted overloads for integral key types added in version 3.13.0 to reject such calls at compile time instead of causing undefined behavior at runtime.
1. Deleted overloads for integral key types added in version 3.13.0 unreleased to reject such calls at compile time instead of causing undefined behavior at runtime.