deepseq

Deep evaluation of data structures

Version on this page:	1.4.1.1
LTS Haskell 20.23:	1.4.6.1
Stackage Nightly 2023-05-31:	1.4.8.0
Latest on Hackage:	1.4.8.1

See all snapshots deepseq appears in

BSD-3-Clause licensed

Maintained by libraries@haskell.org

This version can be pinned in stack with:deepseq-1.4.1.1@sha256:c67bcee2dc27f7ac760185778229c124934c83eb11b2631a4c83aedcc8c32d51,2576

Module documentation for 1.4.1.1

Control
- Control.DeepSeq

Depends on 2 packages(full list with versions):

array, base

Used by 172 packages in lts-6.35(full list with versions):

This package provides methods for fully evaluating data structures ("deep evaluation"). Deep evaluation is often used for adding strictness to a program, e.g. in order to force pending exceptions, remove space leaks, or force lazy I/O to happen. It is also useful in parallel programs, to ensure pending work does not migrate to the wrong thread.

The primary use of this package is via the deepseq function, a "deep" version of seq. It is implemented on top of an NFData typeclass ("Normal Form Data", data structures with no unevaluated components) which defines strategies for fully evaluating different data types.

Changes

Changelog for `deepseq` package

1.4.1.1 Mar 2015

Bundled with GHC 7.10.1
Drop redundant ghc-prim dependency

1.4.1.0 Mar 2015

Drop redundant constraints from a few NFData instances (if possible for a given base version)

1.4.0.0 Dec 2014

Switch to Generics based DefaultSignature rnf method implementation (based on code from deepseq-generics)

Compatibility Note: if you need the exact default-method semantics of deepseq prior to 1.4, replace occurences of
```
instance NFData XYZ
```
by
```
instance NFData XYZ where rnf x = seq x ()
```
New NFData instances for base types:
- Control.Applicative.Const
- Control.Applicative.ZipList
- Control.Concurrent.ThreadId
- Data.Functor.Identity.Identity
- Data.Monoid.{Dual,First,Last,Any,All,Sum,Product}
- Data.Ord.Down
- Data.Proxy.Proxy
- Data.Typeable.Internal.TyCon
- Data.Typeable.Internal.TypeRep
- Data.Unique.Unique
- Data.Void.Void
- GHC.Fingerprint.Type.Fingerprint
- Numeric.Natural.Natural
- System.Mem.StableName.StableName
- Foreign.C.Types.C*

1.3.0.2 Nov 2013

Bundled with GHC 7.8.1
Update package description to Cabal 1.10 format
Add support for GHC 7.8
Drop support for GHCs older than GHC 7.0.1
Add /since: .../ annotations to Haddock comments
Add changelog

1.3.0.1 Sep 2012

No changes

1.3.0.0 Feb 2012

Add instances for Fixed, a->b and Version

1.2.0.1 Sep 2011

Disable SafeHaskell for GHC 7.2

1.2.0.0 Sep 2011

New function force
New operator $!!
Add SafeHaskell support
Dropped dependency on containers

1.1.0.2 Nov 2010

Improve Haddock documentation

1.1.0.1 Oct 2010

Enable support for containers-0.4.x

1.1.0.0 Nov 2009

Major rewrite

1.0.0.0 Nov 2009

Initial release