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# holoscan::PredicateEvaluationSourceKind

> Identify the event that evaluates one predicate.

Identify the event that evaluates one predicate.

```cpp showLineNumbers={false}
enum class holoscan::PredicateEvaluationSourceKind : std::uint8_t
```

---

## Values

| Name           | Value | Description                                      |
| -------------- | ----- | ------------------------------------------------ |
| `kInputUpdate` | `= 0` | Evaluate for every accepted exact driver sample. |
| `kClock`       |       | Evaluate for every selected fixed-phase tick.    |