# `GSCubicHasInflection`

*Function*

## Declaration

```swift
func GSCubicHasInflection(_ p0: NSPoint, _ p1: NSPoint, _ p2: NSPoint, _ p3: NSPoint) -> Bool
```

```objc
BOOL GSCubicHasInflection(NSPoint p0, NSPoint p1, NSPoint p2, NSPoint p3);
```

```python
GSCubicHasInflection(p0: NSPoint, p1: NSPoint, p2: NSPoint, p3: NSPoint) -> bool
```

## See Also

### Inflections, Curvature, and Normals

- [`GSComputeInflection`](/Core/GlyphsCore/GSComputeInflection)
- [`GSComputeInflectionTimes`](/Core/GlyphsCore/GSComputeInflectionTimes)
- [`GSComputeInflectionTimesTolerance`](/Core/GlyphsCore/GSComputeInflectionTimesTolerance)
- [`GSTransformComponents`](/Core/GlyphsCore/GSTransformComponents)
- [`curvatureMaxima`](/Core/GlyphsCore/curvatureMaxima)
- [`GSCurvatureSquaredForT`](/Core/GlyphsCore/GSCurvatureSquaredForT)
- [`GSSignedCurvatureForT`](/Core/GlyphsCore/GSSignedCurvatureForT) — Use this function as compared to `curvatureSquaredForT` if you compute the square root of the result anyway or if you need to know the sign of the curvature.
- [`GSNormalCubicForT`](/Core/GlyphsCore/GSNormalCubicForT)
- [`GSNormalQuadraticForT`](/Core/GlyphsCore/GSNormalQuadraticForT)