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2026-10-02 15:15:16 +00:00
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api/basic_json/count/index.md
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@@ -34,7 +34,8 @@ 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, `count(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).
## Examples
@@ -113,3 +114,4 @@ number of elements with key "three": 0
1. Added in version 3.11.0.
1. Added in version 1.0.0. Changed parameter `key` type to `KeyType&&` in version 3.11.0.
1. 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.