I have been scratching my head trying to figure this out. How do I use foldr1 (or any other fold for that matter) in order to get the sum of tuples in a list. Example: list = [(1,2), (3,4)] sum = 10 I’ve tried foldr1 (\x y -> fst(x) + snd(x) + y) [(1,2),(3,4)] but… Read More Haskell foldr1 lambda function which adds tuple values
#include <array> #include <type_traits> #include <iostream> template<class… Types> class Test { public: Test() : format_({ [&] { if constexpr(std::is_same_v<Types, int64_t>) { return "%ld "; } else if constexpr(std::is_same_v<Types, int32_t>) { return "%d "; } else if constexpr(std::is_same_v<Types, double>) { return "%f "; } }() … }) {} template<typename T, typename … Args> void print_recursive(T &&… Read More Why is there a difference between templated recursive calls and fold expressions with type cast or promotion?
I was making a new path for pages on my site and was trying to figure out how to path to my stylesheet and images cleanly. Here’s an element that shows my problem: <link rel="stylesheet" href="/src/styles.css"> My local copy of my site is hosted here at "E:/Documents/WEBSITE", the local page I’m trying to link the… Read More relative src and href paths work live but not local
I’ve made a foldr function for BinSearchTree, but I’m not quite sure if it’s correct. Do any of you see a problem here? Any tips? (I can’t use deriving Foldable) data BinSearchTree a = Empty | Branch (BinSearchTree a) a (BinSearchTree a) deriving (Eq, Show) instance Foldable BinSearchTree where foldr f x Empty = x… Read More Making a foldl function for BinarySearchTree
Flutter shows error Non-nullable instance field ‘_areas’ must be initialized. Maybe this is because of not defining null in lists areas what when defining null Like List? _areas; it shows an error on the index Error: Field ‘_areas’ should be initialized because its type ‘List’ doesn’t allow null. Error Line: List _areas; Here is my… Read More Field '_areas' should be initialized because its type 'List<Area>' doesn't allow null
As far as I understand .NET concepts, the source code is first translated into an Assembly (IL code+meta data), which is compiled to machine code on the target machine with the CLR’s JIT compiler. However I cannot really match these concepts to what I see when working on a C# project. When I build a… Read More Understanding .NET compilation
Running flask 2.1 w/ python 3.10 trying to create a small app here’s my main.py file contents and directory setup from waitress import serve app = Flask(__name__, template_folder=’/templates’) @app.route("/") def startService(): return "Simple Web app" @app.route("/home") def ohok(): return render_template(‘home.html’) if __name__ == "__main__": serve(app, host="127.0.0.1", port=8080) I have my home.html file correctly formatted placed… Read More Flask render template doesn't render my html page keep getting "internal server error"
i have a simple ui created with pyqt5 it loads a file, let you choose a outputfolder and creats a new txt file with additonals information. the string of the loaded file is written to self.inputs.filename.text() it looks like "C:/User/Folder/File.txt" later in the application i write into a new file in a specific location. new_txt… Read More Cutting Strings Pyhton
Can anyone tell me why the following Link Component is unable to find the linked page? VSCode is literally auto-completing the file name as I type it in but for some reason I keep getting 404. //index.js in WelcomePage folder import styles from "/styles/WelcomePage.module.css"; import Link from "next/link"; function WelcomePage() { return ( <> <h1… Read More How To Stop Link Component From Giving 404 Error in NextJS?
I’ve started python a few months ago, for school projects and I was pretty surprised at the file edition power it had without asking for any permissions. My question is, how far can python go? Can it delete System files? Can it delete normal files? I also saw a video that I didn’t click that… Read More How far can python go?