#3541: Allow local foreign imports
-----------------------------+----------------------------------------------
Reporter: mokus | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler (FFI)
Version: 6.10.4 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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I have no idea the level of difficulty this would entail, but it would be
rather nice to be able to import foreign functions at scopes other than
the top level. When writing glue code, especially for C++ where I often
want to catch and haskellize exceptions, I find myself using wrappers
quite a bit, for example:
{{{
foreign import ccall "foo.h foo"
raw_foo :: CString -> IO ()
foo :: String -> IO ()
foo s = withCString s raw_foo
}}}
Where I only want "foo" exported from the module. It's not that big a
deal to list explicit exports, I know, but I would like to be able to say
instead:
{{{
foo :: String -> IO ()
foo s = withCString s raw_foo
where
foreign import ccall "foo.h foo" raw_foo :: CString -> IO ()
}}}
In addition to reducing clutter in the top level namespace, it makes for
less clutter on the left margin of the code, making it easier to scan
through function names visually.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3541>
GHC <http://www.haskell.org/ghc/>
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