---
title: SparsePreconditioner_t
framework: accelerate
role: symbol
role_heading: Structure
path: accelerate/sparsepreconditioner_t
---

# SparsePreconditioner_t

Constants that define the preconditioner type.

## Declaration

```swift
struct SparsePreconditioner_t
```

## Topics

### Constants

- [SparsePreconditionerDiagScaling](accelerate/sparsepreconditionerdiagscaling.md)
- [SparsePreconditionerDiagonal](accelerate/sparsepreconditionerdiagonal.md)
- [SparsePreconditionerNone](accelerate/sparsepreconditionernone.md)
- [SparsePreconditionerUser](accelerate/sparsepreconditioneruser.md)

### Raw Values

- [init(_:)](accelerate/sparsepreconditioner_t/init(_:).md)
- [init(rawValue:)](accelerate/sparsepreconditioner_t/init(rawvalue:).md)
- [rawValue](accelerate/sparsepreconditioner_t/rawvalue.md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [RawRepresentable](swift/rawrepresentable.md)
- [Sendable](swift/sendable.md)

## See Also

### Preconditioners

- [SparseOpaquePreconditioner_Complex_Double](accelerate/sparseopaquepreconditioner_complex_double.md)
- [SparseOpaquePreconditioner_Complex_Float](accelerate/sparseopaquepreconditioner_complex_float.md)