mirror of
https://github.com/nlohmann/json.git
synced 2026-07-27 22:23:03 +04:00
nlohmann
55 lines
1.4 KiB
Markdown
55 lines
1.4 KiB
Markdown
# <small>nlohmann::basic_json::</small>operator value_t
|
|
|
|
```cpp
|
|
constexpr operator value_t() const noexcept;
|
|
```
|
|
|
|
Return the type of the JSON value as a value from the [`value_t`](value_t.md) enumeration.
|
|
|
|
## Return value
|
|
|
|
the type of the JSON value
|
|
|
|
| Value type | return value |
|
|
|---------------------------|----------------------------|
|
|
| `#!json null` | `value_t::null` |
|
|
| boolean | `value_t::boolean` |
|
|
| string | `value_t::string` |
|
|
| number (integer) | `value_t::number_integer` |
|
|
| number (unsigned integer) | `value_t::number_unsigned` |
|
|
| number (floating-point) | `value_t::number_float` |
|
|
| object | `value_t::object` |
|
|
| array | `value_t::array` |
|
|
| binary | `value_t::binary` |
|
|
| discarded | `value_t::discarded` |
|
|
|
|
## Exception safety
|
|
|
|
No-throw guarantee: this member function never throws exceptions.
|
|
|
|
## Complexity
|
|
|
|
Constant.
|
|
|
|
## Examples
|
|
|
|
??? example
|
|
|
|
The following code exemplifies `operator value_t()` for all JSON types.
|
|
|
|
```cpp
|
|
--8<-- "examples/operator__value_t.cpp"
|
|
```
|
|
|
|
Output:
|
|
|
|
```json
|
|
--8<-- "examples/operator__value_t.output"
|
|
```
|
|
|
|
## Version history
|
|
|
|
- Added in version 1.0.0.
|
|
- Added unsigned integer type in version 2.0.0.
|
|
- Added binary type in version 3.8.0.
|