| Copyright | © 2007–2012 Gracjan Polak; © 2012–2016 Ömer Sinan Ağacan; © 2017-2023 Albert Krewinkel |
|---|---|
| License | MIT |
| Maintainer | Albert Krewinkel <tarleb@hslua.org> |
| Stability | beta |
| Portability | non-portable (depends on GHC) |
| Safe Haskell | Safe-Inferred |
| Language | Haskell2010 |
HsLua.Core.Closures
Description
Expose Haskell functions as Lua closures.
Synopsis
- pushPreCFunction :: PreCFunction -> LuaE e ()
- pushHaskellFunction :: LuaError e => HaskellFunction e -> LuaE e ()
Documentation
pushPreCFunction :: PreCFunction -> LuaE e () Source #
Converts a pre C function to a Lua function and pushes it to the stack.
Pre C functions collect parameters from the stack and return a CInt
that represents number of return values left on the stack.
See CFunction for more info.
pushHaskellFunction :: LuaError e => HaskellFunction e -> LuaE e () Source #
Pushes Haskell function as a callable userdata. All values created
will be garbage collected. The function should behave similar to a
CFunction.
Error conditions should be indicated by raising a catchable exception
or by returning the result of error
Example:
mod23 :: Lua NumResults
mod23 = do
mn <- tointeger (nthBottom 1)
case mn of
Nothing -> pushstring "expected an integer" *> error
Just n -> pushinteger (n `mod` 23)
pushHaskellFunction mod23
setglobal "mod23"