matter | A tiny collection of UI components | User Interface library
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A tiny collection of UI components.
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QUESTION
"scripts": {
"start": "SET NODE_ENV=staging && nodemon app",
"production": "set NODE_ENV=production && nodemon app",
"test": "echo \"Error: no test specified\" && exit 1"
},
ANSWER
Answered 2021-Jun-16 at 03:49The likely problem is that the space character before && becomes part of the environment-variable values, so that the values are staging and production - note the trailing space - rather than staging and production.
The simplest way to avoid this is to remove the space before && (it looks awkward, but it works):
QUESTION
What's the point of the name of a single file vue component?
In this example:
...ANSWER
Answered 2021-Jun-16 at 00:25A good justification for the name is that lets say you have a naming convention to your files and for components.
For example if all components are named with what they are but not appended with comp (ie: Inventory.vue instead of InventoryComp.vue) and when you use them you want to be more explicit about what they are (components) so you want to use this component like this: . An easy way to do this is to use the name property and set it like this in your Inventory.vue:
QUESTION
I'm working on a TUI (Text User Interface) library for C++, and I have a function for detecting the size of the console window. Is it possible for me to detect a window resize? I would prefer if it would work with any terminal emulator, but if it matters I am using Ubuntu Budgie 20.10, and my terminal emulator is Tilix.
...ANSWER
Answered 2021-Apr-25 at 23:23You can set up a signal handler for the SIGWINCH signal, and you will get this signal whenever the terminal size changes. Note that, as with all signal handlers, any code in the signal handler must be signal-safe.
If you are using the curses library, you will get a KEY_RESIZE key, and then check COLS and LINES.
QUESTION
In C++20, we got the capability to sleep on atomic variables, waiting for their value to change.
We do so by using the std::atomic::wait method.
Unfortunately, while wait has been standardized, wait_for and wait_until are not. Meaning that we cannot sleep on an atomic variable with a timeout.
Sleeping on an atomic variable is anyway implemented behind the scenes with WaitOnAddress on Windows and the futex system call on Linux.
Working around the above problem (no way to sleep on an atomic variable with a timeout), I could pass the memory address of an std::atomic to WaitOnAddress on Windows and it will (kinda) work with no UB, as the function gets void* as a parameter, and it's valid to cast std::atomic to void*
On Linux, it is unclear whether it's ok to mix std::atomic with futex. futex gets either a uint32_t* or a int32_t* (depending which manual you read), and casting std::atomic to u/int* is UB. On the other hand, the manual says
The uaddr argument points to the futex word. On all platforms, futexes are four-byte integers that must be aligned on a four- byte boundary. The operation to perform on the futex is specified in the futex_op argument; val is a value whose meaning and purpose depends on futex_op.
Hinting that alignas(4) std::atomic should work, and it doesn't matter which integer type is it is as long as the type has the size of 4 bytes and the alignment of 4.
Also, I have seen many places where this trick of combining atomics and futexes is implemented, including boost and TBB.
So what is the best way to sleep on an atomic variable with a timeout in a non UB way? Do we have to implement our own atomic class with OS primitives to achieve it correctly?
(Solutions like mixing atomics and condition variables exist, but sub-optimal)
...ANSWER
Answered 2021-Jun-15 at 20:48You shouldn't necessarily have to implement a full custom atomic API, it should actually be safe to simply pull out a pointer to the underlying data from the atomic and pass it to the system.
Since std::atomic does not offer some equivalent of native_handle like other synchronization primitives offer, you're going to be stuck doing some implementation-specific hacks to try to get it to interface with the native API.
For the most part, it's reasonably safe to assume that first member of these types in implementations will be the same as the T type -- at least for integral values [1]. This is an assurance that will make it possible to extract out this value.
... and casting
std::atomictou/int*is UB
This isn't actually the case.
std::atomic is guaranteed by the standard to be Standard-Layout Type. One helpful but often esoteric properties of standard layout types is that it is safe to reinterpret_cast a T to a value or reference of the first sub-object (e.g. the first member of the std::atomic).
As long as we can guarantee that the std::atomic contains only the u/int as a member (or at least, as its first member), then it's completely safe to extract out the type in this manner:
QUESTION
Update: Added a simpler demonstration jsfiddle, https://jsfiddle.net/47sfj3Lv/3/.
reproducing the problem in much less code I'm trying to move away from jQuery.
Some of my code, for populating some tables, has code like this
...ANSWER
Answered 2021-Jun-15 at 18:27This was difficult for me to understand, so I wanted to share if anyone else has the same issue.
It seems that an async method will break a method chain, there's no way around that. And since fetch is asynchronous, await must be used, and in order for await to be used, the calling method must be declared async. Thus the method chain will be broken.
The way the method chain is called must be changed.
In my OP, I linked https://jsfiddle.net/47sfj3Lv/3/ as a much simpler version of the same problem. StackOverflow's 'fiddle' effectively blocks 'fetch' for security reasons, so I need to use JSFiddle for demonstration.
Here's a working version of the same code using then and how/why it works, and a slightly shorter version, because await can be specified with the the fetch, obviously.
QUESTION
The highest Y position that is shown in my camera is 5 and -5. For the X its 10. I'm making a tower defense game and I want the tower to follow my mouseposition after I buy it until I click on a place in the track to build/ place it. I got so confused because I couldn't see my tower at all but now I realized that my mouse coordinates are HUGE. It's up to the hundreds on each axis. My screen obviously can't fit that. I tried even dividing the mouseposition in a vector 2 by 45 and making an offset so it can fit well. Unfortunately I have to change the values depending on the screen size so that can't work. I don't know if it matters but here's my script? This script get's called after the tower gets instantiated from the store. The store button is in the canvas if that helps? Maybe the canvas is why everything is off? How do I fix it?
...ANSWER
Answered 2021-Jun-15 at 15:03In Unity, Input.MousePosition is measured in terms of pixels on your screen. Let's say you have a 1080p monitor - 1920 x 1080 - which is pretty common these days, that means Input.MousePosition will be in the following range when your game is fullscreen:
- x: 0 to 1919
- y: 0 to 1079
The actual world units - the units as seen in your scene - don't matter at all and can be basically anything.
Another thing of note is that your gameworld is 3D and the physical screen is 2D. Assuming your camera is looking into open space in your world, a single pixel on the screen is represented by an infinite line in the 3D world. This line is called a ray, and you can turn a 2D screen position into a ray via Camera.ScreenPointToRay, and then find what 3D objects that line intersects with via a Physics.Raycast.
QUESTION
I'm trying to display data from firebase in an antd table using hooks. I created a mini version of this application with a simple bootstrap design pulling the data from firebase with:
...ANSWER
Answered 2021-Jun-15 at 14:46I have the dumb and answered my own question. I did not in fact try every variation with/without .columns.
QUESTION
In below shown DAG I want to execute task d no matter whether tasks b & c are success or failed, But for task e If tasks b, c & d are success then only it should be triggered. DAG Image
Written below code but it is not working:
...ANSWER
Answered 2021-Jun-15 at 13:49You need to code the branch of your workflow tree in separate statements.
QUESTION
I need a trait that allows me to construct a object that borrows an object that borrows something. In the following example that is PaperBin. https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=78fb3f88b71bc226614912001ceca65b
...ANSWER
Answered 2021-Jun-15 at 13:38Your immediate issue is that T: GarbageBin<'a, 'b> where 'a and 'b are parameters of create_bin_with_rubbish and must therefore outlive calls to that function—but the actual lifetimes passed to T::new are only internal to the function and do not therefore satisfy those bounds.
Instead of parameterising create_bin_with_rubbish with lifetimes 'a and 'b, one way to resolve this would be to use instead an HRTB (higher-ranked trait bound):
QUESTION
I've been using the YouTube IFrame API to shuffle multiple of my playlists together. I've got a very bare-bones HTML page with a 'next' and 'previous' button, and a bunch of javascript that loads up and plays videos and handles the button events.
The general order of events when the script loads is
...ANSWER
Answered 2021-Jun-15 at 13:19This issue appears to have resolved itself. I suspect it was a bug in the iframe api or maybe the youtube backend which has been fixed by the youtube engineers. So iframe team, if you see this, thanks!
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