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nlohmann
2026-10-02 15:15:16 +00:00
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api/basic_json/contains/index.md
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@@ -50,6 +50,7 @@ Logarithmic in the size of the JSON object.
- This method always returns `false` when executed on a JSON type that is not an object.
- This method can be executed on any JSON value type.
- Calling this function with an integer argument (for example, `contains(0)`) does not compile: such an argument would otherwise implicitly convert to a null `const char*` and, from there, cause undefined behavior when constructing a `std::string` for the object key. To check for an array element instead, use [`at`](https://json.nlohmann.me/api/basic_json/at/index.md), [`operator[]`](https://json.nlohmann.me/api/basic_json/operator%5B%5D/index.md), or compare against [`size`](https://json.nlohmann.me/api/basic_json/size/index.md).
Postconditions
@@ -197,3 +198,4 @@ 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.