eternal | constexpr map and hash map | File Utils library
kandi X-RAY | eternal Summary
kandi X-RAY | eternal Summary
eternal.hpp is a header-only C++ implementation of constexpr/compile-time maps and hash maps. It provides an API that is somewhat compatible with std::map/std::unordered_map, but doesn't support insertion, or other modifications. It's main focus is in binary size: it generates minimal code and doesn't incur any static initialization overhead.
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QUESTION
So, I'm currently a student in an intro to computer science course, and for my final I'm working with a text file of books with information attached.
I have a function which asks for a start year, and an end year. The function will then print out all of the books within the year range given by the user.
The problem I'm having is that the same book is being printed multiple times.
...ANSWER
Answered 2021-Jun-05 at 18:40The problem here is index. Remember that returns you the FIRST match. If you have four books from 2005, then you'll see that first book four times.
QUESTION
I have a app.config file while is built as per the below :-
...ANSWER
Answered 2021-Jun-05 at 13:06I haven't actually found out why I can only see 4 entries in the ConfigurationManager.AppSettings, but I have worked around the problem.
I moved the config values into their own section within the app.config using :
QUESTION
I'm having an issue with file uploading with Multer and unfortunately, I don't have a lot of experience with Multer. In this project, I'm trying to structure things such that routes call functions (controllers) which run commands, for example creating a product etc.
I'm pretty sure I set up Multer correctly, however when I try to req.file.filename in the controller it returns an undefined.
This is my setup (currently Multer is a helper function, I'm going to move it to middleware after as this is incorrect).
File Storage Helper Func
...ANSWER
Answered 2021-Jun-02 at 14:36This statement: return console.log(req.file) in postProduct prevents the rest of the code from running and returns void. Console.log always returns void.
If you want to just log the file and continue with the rest of the function, remove the return keyword: console.log(req.file).
What does the console.log output in the terminal when you run the app?
QUESTION
I'm doing a project at school where I need to connect a website and my android app to a PostgreSQL database, I have tried to connect directly using JDBC, but it didn't work at all. I also have read about using some API, but I didn't understand how to do it I'm clueless about what to do now Does anyone know how to connect an android app to PostgreSQL? I will be eternally grateful I really need to do finish this project.
Edit : The problem with jdbc is that console always printed "Connection failed" Here is my JDBC attempt
...ANSWER
Answered 2021-Jun-02 at 08:48The answer is quite simple, just like @cutiko said i needed to create a rest API (that is a backend website that connects directly with the database, then i send the data to the website and the site does the rest of the communication with the database) [image that explains how it works][1]
To make the Api i used node.js, express and sequilize, here is a link that explains how to do it: https://scotch.io/tutorials/getting-started-with-node-express-and-postgres-using-sequelize
here is an example of how i made the connection from android studio (Kotlin) to the api: this is a simple login request where the database returns a bool (false if the user cant login, true if the user can) the following image shows the API returning the data (false or true), i wrote an email and a password that obviously doesnt exist, if i wrote an email and a password that exists in the database the API would return true instead [API returning the data][2]
QUESTION
I'm making a simple Word Builder type of game (where one player enters a word, and the other player enters a word starting with the last letter of the first player's word), and I'm trying to get it so that the MasterClient starts the the game by typing in the first word, then his InputField gets disabled, and the second player's InputField gets enabled, and he types a word and vice versa.
I have tried multiple ways, all of which were from my basic knowledge of Unity and C#. Here's one for example that I thought would definitely work, but didn't.
...ANSWER
Answered 2021-Jun-01 at 05:15You could store the currently active Player.ActorNumber and on the Master use Player.GetNextFor
Gets a Player's next Player, as sorted by ActorNumber (Player.ID). Wraps around.
Useful when you pass something to the next player. For example: passing the turn to the next player.
like e.g.
QUESTION
I am developing a simple UWP app which needs to listen to a serial port connected to an esp32 which has a rfid reader attached.
It needs to receive UID of card, navigate to new page, and then navigate back to the original page after a timer has elapsed, or a button has been clicked.
It is all working, except for the part where I navigate back to the original parent page. I believe it's because the app is trying to reconnect to the serial port, but it's unavailalbe. I've tested my theory by creating a setup button with the serial connection setup on this and it does work as expected.
So, does Page_Loaded fire every time the page is reloaded? Is there a function which only fires on the first loading of the form? I can't get disposing of the serial port to work at all, i just get an unhandled exception. I don't have a problem leaving the serial port open though, but this seems to be causing problems too!
Please see some sample code below:
...ANSWER
Answered 2021-May-28 at 08:52So, does Page_Loaded fire every time the page is reloaded?
Yes.
Is there a function which only fires on the first loading of the form?
You could use a boolean flag to determine whether to execute your method:
QUESTION
I want the elements to show up on mobile devices but not on desktop as the element are controlled with a :hover. On mobile devices obviously you can't* :hover so I need them to show up. The problem is that even on the smaller widths, if one shrinks their desktop screen down to the smaller widths then the elements show up. I can't single out every device on the media queries so my elements only show up on mobile devices.
*EDIT: changed can to can't
...ANSWER
Answered 2021-May-27 at 06:22While as you say you cannot test for every single device (and it's an insecure thing to do anyway) you can test, as MDN puts it, to see if
the primary input mechanism can conveniently hover over elements.
I am not sure exactly how 'conveniently' is defined here, but MDN deems having to do a long touch as not in that category.
Here's their example as a snippet:
QUESTION
I have a Rails app using the following: Sphinx 2.2.11-id64-release (95ae9a6) Thinking Sphinx 4.4.1 Flying Sphinx 1.2.0
Currently I am successfully able to reindex (rake ts:rebuild) on development. When I do so, I see it generate development.sphinx.conf. When I push this to staging on heroku, I run the same command and get:
...ANSWER
Answered 2021-May-27 at 01:42I think you may be in a situation where you're using older gems than the documentation expects. For flying-sphinx v1.x, you need to use the flying-sphinx executable instead of the ts:-prefixed rake tasks: heroku run bundle exec flying-sphinx rebuild.
If you upgrade to flying-sphinx v2.x, then you'll be able to use the ts rake tasks on Heroku as well as locally. (Yes, this would have been the ideal behaviour from the get-go, but better late than never!)
QUESTION
I am using Python to automate a process in SAP GUI, with the library win32com.client.
Everything was going right, until the SAP open an Excel file on the final of the process.
I need to close this file (and only this file).
The original script came from a .bas file, and I rewrote the necessary to Python.
In the .bas file the Excel file was closed with Workbooks("YVA05_********").Close
Please help me with a simple line to close only this Excel file (like the old code, but for my Python application) and I will be eternally grateful.
Cheers
...ANSWER
Answered 2021-May-24 at 17:33Hopefully, this function will solve your problem
QUESTION
I have this working in a React Native Class Component, but cannot get it to work in a Function Component. I am reading data from a text file using react-native-fs. The file is read asynchronously and the data is available as a javascript Promise object. First the working code:
...ANSWER
Answered 2021-May-16 at 20:20You can have state in function components using hooks:
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