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C++: how to do "map" of Scheme


C++: how to do "map" of Scheme

By : TAchim
Date : November 19 2020, 12:41 AM
it should still fix some issue There is no predefined exact equivalent... but it's not difficult to write:
code :
template<typename T, typename F>
T mymap(const T& container, F f) {
    T result;
    for (auto const & x : container) {
        result.push_back(f(x));
    }
    return result;
}

std::vector<int> translate(const std::vector<int>& x, int delta) {
    return mymap(x, [=](int x){return x+delta;});
}


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Team City CI with Xcode workspace - Scheme "My Scheme" is not configured for running

Team City CI with Xcode workspace - Scheme "My Scheme" is not configured for running


By : Sas_noob1
Date : March 29 2020, 07:55 AM
help you fix your problem I found solution. The problem was about poor support of SenTestKit with xcodebuild command. To make it works I had to go Edit Scheme menu and set Run step so the test scheme became runnable.
for solution this article. There're few things was actually different, it is a Test After Build setting and macros. In my case it runs test only with YES option and I did not have to write any macros. Mb they fix the issue that was described in the article.
Recursion scheme in Haskell for repeatedly breaking datatypes into "head" and "tail" and yielding a

Recursion scheme in Haskell for repeatedly breaking datatypes into "head" and "tail" and yielding a


By : user3819036
Date : March 29 2020, 07:55 AM
will help you This looks like a special case of a (jargon here but it can help with googling) paramorphism, a generalisation of primitive recursion to all initial algebras.
Reimplementing ListCase
code :
module ListCase where

paraList :: (a -> [a] -> b -> b) -- cons
            -> b                 -- nil
            -> [a] -> b          -- resulting function on lists
paraList c n []       = n
paraList c n (x : xs) = c x xs $ paraList c n xs
listCase' :: (a -> [a] -> b) -> [a] -> [b]
listCase' c = paraList (\ x xs tl -> c x xs : tl) []
newtype Fix f = Fix { unFix :: f (Fix f) }
newtype ListF a as = ListF { unListF :: Maybe (a, as) }
type List a = Fix (ListF a)

nil :: List a
nil = Fix $ ListF $ Nothing

cons :: a -> List a -> List a
cons = curry $ Fix . ListF .Just
para :: Functor f => (f (Fix f, b) -> b) -> Fix f -> b
para alg = alg . fmap (\ rec -> (rec, para alg rec)) . unFix
instance Functor (ListF a) where fmap f = ListF . fmap (fmap f) . unListF

paraList' :: (a -> List a -> b -> b) -> b -> List a -> b
paraList' c n = para $ maybe n (\ (a, (as, b)) -> c a as b) . unListF

listCase'' :: (a -> List a -> b) -> List a -> List b
listCase'' c = paraList' (\ x xs tl -> cons (c x xs) tl) nil
toList :: [a] -> List a
toList = foldr cons nil

fromList :: List a -> [a]
fromList = paraList' (\ x _ tl -> x : tl) []

*ListCase> fmap fromList . fromList . listCase'' (\ _ as -> toList $ take 3 $ fromList as). toList $ [1..5]
[[2,3,4],[3,4,5],[4,5],[5],[]]
"APK Signature Scheme v2" is supported only by "apksigner" not by "jarsigner"

"APK Signature Scheme v2" is supported only by "apksigner" not by "jarsigner"


By : Ardy
Date : March 29 2020, 07:55 AM
To fix the issue you can do Yes, you'll need to switch away from jarsigner.
jarsigner is for signing JAR files. Thus, I don't believe jarsigner will ever support APK Signature Scheme v2 -- it just would not make sense. You'll need to use apksigner or other tools which support APK Signature Scheme v2.
How can I resolve the error "URL scheme must be "http" or "https" for CORS request." for t

How can I resolve the error "URL scheme must be "http" or "https" for CORS request." for t


By : user3233258
Date : March 29 2020, 07:55 AM
I wish this help you You need to be serving your index.html locally or have your site hosted on a live server somewhere for the Fetch API to work properly. The files need to be served using the http or https protocols.
If you just clicked on your index.html from your file explorer than your browser is grabbing those files directly from your file system. This is why the error is showing you an absolute path from the root folder on you computer.
Scheme/"The Seasoned Schemer": Question about the syntax of the definition of "try" function

Scheme/"The Seasoned Schemer": Question about the syntax of the definition of "try" function


By : Michael
Date : March 29 2020, 07:55 AM
it helps some times Syntax rules is pattern matching. A dot indicates the car and cdr of a pair just like rest arguments in lambda / define:
code :
(define (my-list . args)
  args)
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