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api/basic_json/count.md
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@@ -40,7 +40,11 @@ Logarithmic in the size of the JSON object.
## Notes
This method always returns `0` when executed on a JSON type that is not an object.
- This method always returns `0` when executed on a JSON type that is not an object.
- Calling this function with an integer argument (for example, `#!cpp count(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).
## Examples
@@ -81,3 +85,5 @@ This method always returns `0` when executed on a JSON type that is not an objec
1. Added in version 3.11.0.
2. Added in version 1.0.0. Changed parameter `key` type to `KeyType&&` in version 3.11.0.
3. Deleted overload for integral key types added in version 3.13.0 to reject such calls at compile time instead of
causing undefined behavior at runtime.