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nlohmann
2026-10-02 15:15:16 +00:00
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api/basic_json/contains.md
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@@ -58,6 +58,10 @@ Logarithmic in the size of the JSON object.
- This method always returns `#!cpp 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, `#!cpp contains(0)`) does not compile: such an argument
would otherwise implicitly convert to a null `#!cpp const char*` and, from there, cause undefined behavior when
constructing a `#!cpp std::string` for the object key. To check for an array element instead, use [`at`](at.md),
[`operator[]`](operator%5B%5D.md), or compare against [`size`](size.md).
!!! info "Postconditions"
@@ -117,3 +121,5 @@ Logarithmic in the size of the JSON object.
1. Added in version 3.11.0.
2. Added in version 3.6.0. Extended template `KeyType` to support comparable types in version 3.11.0.
3. Added in version 3.7.0.
4. 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.