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GHC 9.10.3 · lts/ghc-9.10.x · c74966e · 2026-09-27

Moduleinline-c-0.9.1.10Haskell2010

Language.C.Inline.Unsafe

unsafe variants of the Language.C.Inline quasi-quoters, to call the C code unsafely in the sense of https://www.haskell.org/onlinereport/haskell2010/haskellch8.html#x15-1590008.4.3. In GHC, unsafe foreign calls are faster than safe foreign calls, but the user must guarantee the control flow will never enter Haskell code (via a callback or otherwise) before the call is done.

This module is intended to be imported qualified:

import qualified Language.C.Inline.Unsafe as CU
  • 3 values
valuepure :: QuasiQuoter
#

Variant of exp, for use with expressions known to have no side effects.

BEWARE: Use this function with caution, only when you know what you are doing. If an expression does in fact have side-effects, then indiscriminate use of pure may endanger referential transparency, and in principle even type safety. Also note that the function may run more than once and that it may run in parallel with itself, given that unsafeDupablePerformIO is used to call the provided C code to ensure good performance using the threaded runtime. Please refer to the documentation for unsafeDupablePerformIO for more details.