mirror of
https://github.com/nlohmann/json.git
synced 2026-09-30 22:15:19 +00:00
54455afa40
- API pages for basic_json_document and basic_json_view, one per member, and for the four aliases, each with an example - features/json_view.md: the problem the view solves, ownership and lifetime, what matches basic_json::parse() and what differs, and when to choose json, ordered_json, SAX, or the view - the examples show why one would use the view, not only how: borrowed vs. owned input, reading a few fields and materializing one subtree, reusing a document across many messages - registered in the mkdocs navigation, llms.txt, the docset, the exceptions page (out_of_range.416), architecture.md, the integration page, and the README; the yyjson credit is added to the README and license.md Signed-off-by: Niels Lohmann <mail@nlohmann.me>
1.0 KiB
1.0 KiB
nlohmann::basic_json_view::is_array
bool is_array() const noexcept;
This function returns #!cpp true if and only if the value is an array.
Return value
#!cpp true if the type is an array, #!cpp false otherwise.
Exception safety
No-throw guarantee: this function never throws exceptions.
Complexity
Constant.
Examples
??? example
The example below classifies several parsed documents by the type of their root value, without materializing any
of them into a `BasicJsonType` value.
```cpp
--8<-- "examples/basic_json_view__type_predicates.cpp"
```
Output:
```json
--8<-- "examples/basic_json_view__type_predicates.output"
```
See also
- is_structured - return whether the type is structured
- size, empty - the number of elements, and whether there are none
BasicJsonType::is_array- the corresponding function ofbasic_json
Version history
- Added in version 3.13.0.