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{-# LANGUAGE
RankNTypes,
TemplateHaskell,
NoMonomorphismRestriction
#-}
-----------------------------------------------------------------------------
-- |
-- Module : Main
-- Author : Matthew Mirman ( mmirman@andrew.cmu.edu )
-- Stability : experimental
-- Portability : portable
-- Description : An example module for Control.Monad.Imperative
--
-- Some exampes of use.
-----------------------------------------------------------------------------
module Main where
import Control.Monad.Imperative
swap(r1,r2) = function $ do
{
z <- new auto;
z =: r1;
r1 =: r2;
r2 =: z;
return' r1;
};
imperativeId(r1) = function $ do
{
return' r1;
};
type NumLit = forall r a . Num a => V TyVal r a
deferer() = function $ do
{
a <- new 0;
b <- new 2;
defer' a;
defer' $ do {
io $ putStrLn "hi1";
io $ putStrLn "hi2";
};
defer' $ do {
imperativeId(a);
io $ putStrLn "hi3";
return' b;
};
return' a;
}
print' v = do
v' <- val v
io $ print v'
factorial :: (Show r, Num r, Ord r) => () -> MIO i b r
factorial() = function $ do
{
a <- new 0;
n <- new 1;
a =: (0 :: NumLit);
for' ( a =: Lit 1 , a <. Lit 11 , a +=: Lit 1 ) $ do
{
b <- new 0;
b =: a;
defer' $ do {
print' b;
};
n *=: a;
if' ( a <. Lit 5)
continue';
if' ( a >. Lit 2)
break';
return' a;
};
a =: imperativeId(a);
swap( (&)n , (&)a);
return' a;
};
main = do
t <- runImperative $ deferer()
putStrLn $ "Defer: " ++ show t
j <- runImperative $ factorial()
putStrLn $ "Factorial: " ++ show j
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