text-1.2.1.3: An efficient packed Unicode text type.

Copyright | (c) 2009, 2010, 2011 Bryan O'Sullivan
License | BSD-style
Maintainer | bos@serpentine.com
Stability | experimental
Portability | portable
Safe Haskell | None
Language | Haskell98

Data.Text.Internal.Unsafe

Description

Warning: this is an internal module, and does not have a stable API or name. Functions in this module may not check or enforce preconditions expected by public modules. Use at your own risk!

A module containing unsafe operations, for very very careful use in heavily tested code.

Synopsis

- inlineInterleaveST :: ST s a -> ST s a
- inlinePerformIO :: IO a -> a

# Documentation

inlineInterleaveST :: ST s a -> ST s a

Allow an `ST` computation to be deferred lazily. When passed an action of type `ST` `s` `a`, the action will only be performed when the value of `a` is demanded.

This function is identical to the normal unsafeInterleaveST, but is inlined and hence faster.

Note: This operation is highly unsafe, as it can introduce externally visible non-determinism into an `ST` action.

inlinePerformIO :: IO a -> a

Just like unsafePerformIO, but we inline it. Big performance gains as it exposes lots of things to further inlining. Very unsafe. In particular, you should do no memory allocation inside an `inlinePerformIO` block. On Hugs this is just `unsafePerformIO`.