PHPのextensionでHaskellを呼び出す - ログ日記
ソースをダウンロード。 apt-get source php5 cd php5-5.2.0+dfsg/ext ./ext_skel --extname=haskelltest cd haskelltest/comfig.m4 のコメント解除。 PHP_ARG_ENABLE(haskelltest, whether to enable haskelltest support, Make sure that the comment is aligned: [ --enable-haskelltest Enable haskelltest support])コンパイルテスト。 phpize ./configure makephp_haskelltest.h に関数宣言を追加。 PHP_FUNCTION(haskelltest);haskelltest.c に 関数定義を追加。 PHP_FE(ha
How to print integer literals in binary or hex in haskell?
How to print integer literals in binary or hex in haskell? printBinary 5 => "0101" printHex 5 => "05" Which libraries/functions allow this? I came across the Numeric module and its showIntAtBase function but have been unable to use it correctly. > :t showIntAtBase showIntAtBase :: (Integral a) => a -> (Int -> Char) -> a -> String -> String
How do you combine filter conditions
The liftM2 combinator can be used in the Reader monad to do this in a 'more functional' way: import Control.Monad import Control.Monad.Reader -- .... filter (liftM2 (&&) odd (> 100)) [1..200] Note that the imports are important; Control.Monad.Reader provides the Monad (e ->) instance that makes this all work. The reason this works is the reader monad is just (e ->) for some environment e. Thus, a
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