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Conflicts in the See also lists of nine basic_json pages, is_discarded.md, and features/index.md, where develop (#5638) and this branch both added entries: kept both. Ran make amalgamate. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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948 B
nlohmann::basic_json::is_boolean
constexpr bool is_boolean() const noexcept;
This function returns #!cpp true if and only if the JSON value is #!json true or #!json false.
Return value
#!cpp true if type is boolean, #!cpp false otherwise.
Exception safety
No-throw guarantee: this member function never throws exceptions.
Complexity
Constant.
Examples
??? example
The following code exemplifies `is_boolean()` for all JSON types.
```cpp
--8<-- "examples/is_boolean.cpp"
```
Output:
```json
--8<-- "examples/is_boolean.output"
```
See also
- boolean_t the type used to store JSON booleans
- is_primitive checks whether the JSON value is primitive
- basic_json_view::is_boolean - the same check on a zero-copy view
Version history
- Added in version 1.0.0.