primitive | Reproducing images with geometric primitives | Computer Vision library
kandi X-RAY | primitive Summary
kandi X-RAY | primitive Summary
Reproducing images with geometric primitives.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of primitive
primitive Key Features
primitive Examples and Code Snippets
Lines of Code : 9
License : No License
Copyconst isPrimitive = val => Object(val) !== val;
isPrimitive(null); // true
isPrimitive(undefined); // true
isPrimitive(50); // true
isPrimitive('Hello!'); // true
isPrimitive(false); // true
isPrimitive(Symbol()); // true
isPrimitive([]); // fal private Object toPrimitive(JsonPrimitive jsonValue, JsonDeserializationContext context) {
if (jsonValue.isBoolean())
return jsonValue.getAsBoolean();
else if (jsonValue.isString())
return jsonValue.getAsString( def prim(G, s):
dist, known, path = {s: 0}, set(), {s: 0}
while True:
if len(known) == len(G) - 1:
break
mini = 100000
for i in dist:
if i not in known and dist[i] < mini:
min def find_primitive(n: int) -> int | None:
for r in range(1, n):
li = []
for x in range(n - 1):
val = pow(r, x, n)
if val in li:
break
li.append(val)
else:
Community Discussions
Trending Discussions on primitive
QUESTION
I was following along with this tutorial on creating a concurrent counter struct for a usize value: ConcurrentCounter. As I understand it, this wrapper struct allows us to mutate our usize value, with more concise syntax, for example:my_counter.increment(1) vs. my_counter.lock().unwrap().increment(1).
Now in this tutorial our value is of type usize, but what if we wanted to use a f32, i32, or u32 value instead?
I thought that I could do this with generic type arguments:
...ANSWER
Answered 2021-Jun-15 at 23:55I haven't come across such a ConcurrentCounter library, but crates.io is huge, maybe you find something. However, if you are mostly concerned with primitives such as i32, there is a better alternative call: Atomics, definitely worth checking out.
Nevertheless, your approach of generalizing the ConcurrentCounter is going in a good direction. In the context of operation overloading, std::ops is worth a look. Specifically, you need Add, Sub, and Mul, respectively. Also, you need a Copy bound (alternatively, a Clone would also do). So you were pretty close:
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
I'm trying to create a few generic recursive types to modify structure of existing types. I can't tell why the sections inferring arrays and nested objects is not getting triggered. Any idea what I'm doing wrong?
TS playround link with the below code:
...ANSWER
Answered 2021-Jun-15 at 00:56Assuming what I mentioned in my comment on your question, the fix is just to simplify your FieldWithConfidence type significantly. Right now it is trying to add a number of additional levels of structure beyond what you seem to want. Here is a version of that type that works as I think you intend:
QUESTION
This is the code I have written for the MPI's Group Communication Primitives-Brod cast example using c language try with Ubuntu system. I wrote a code for the string and variable concatenation here.
When I am compiling this code it shows error like that.(Please refer the image)
Can anyone help me to solve this?
...ANSWER
Answered 2021-Jun-15 at 12:43Change this line :
QUESTION
I'm trying to understand best practices for Golang concurrency. I read O'Reilly's book on Go's concurrency and then came back to the Golang Codewalks, specifically this example:
https://golang.org/doc/codewalk/sharemem/
This is the code I was hoping to review with you in order to learn a little bit more about Go. My first impression is that this code is breaking some best practices. This is of course my (very) unexperienced opinion and I wanted to discuss and gain some insight on the process. This isn't about who's right or wrong, please be nice, I just want to share my views and get some feedback on them. Maybe this discussion will help other people see why I'm wrong and teach them something.
I'm fully aware that the purpose of this code is to teach beginners, not to be perfect code.
Issue 1 - No Goroutine cleanup logic
...ANSWER
Answered 2021-Jun-15 at 02:48It is the
mainmethod, so there is no need to cleanup. Whenmainreturns, the program exits. If this wasn't themain, then you would be correct.There is no best practice that fits all use cases. The code you show here is a very common pattern. The function creates a goroutine, and returns a channel so that others can communicate with that goroutine. There is no rule that governs how channels must be created. There is no way to terminate that goroutine though. One use case this pattern fits well is reading a large resultset from a database. The channel allows streaming data as it is read from the database. In that case usually there are other means of terminating the goroutine though, like passing a context.
Again, there are no hard rules on how channels should be created/closed. A channel can be left open, and it will be garbage collected when it is no longer used. If the use case demands so, the channel can be left open indefinitely, and the scenario you worry about will never happen.
QUESTION
Like
make,
scons has a large number of predefined variables and rules. (Try scons | wc on an SConstruct containing env = Environment(); print(env.Dump()) to see how extended the set is.)
But suppose we aren't after the wizardry of presets but rather want to do something a lot more primitive—simulating launching a few instructions from the (bash, etc) command line?
Also suppose we're quite happy with the default Decider('MD5'). What is the translation of the one-souce-one-target:
ANSWER
Answered 2021-Jun-14 at 17:43All the answers you're looking for are in the users guide (and manpage)
Firstly, assuming you don't want to scan the input files to add included files specified in the input files, you can use Commmand()
(See info here: https://scons.org/doc/production/HTML/scons-user.html#chap-builders-commands)
Then you'll want an alias to specify an a non file command line target (See here:https://scons.org/doc/production/HTML/scons-user.html#chap-alias)
Putting those two together yields
QUESTION
I know this question has been asked many times, but I still can't figure out what to do (more below).
I'm trying to spawn a new thread using std::thread::spawn and then run an async loop inside of it.
The async function I want to run:
...ANSWER
Answered 2021-Jun-14 at 17:28#[tokio::main] converts your function into the following:
QUESTION
I wanted to know how does a primitive character is serialized in java. I serialized a class to understand how byte information is stored in java. Following is the class which I serialised.
...ANSWER
Answered 2021-Jun-13 at 15:30Java strings are UTF-8 encoded in the default serialization.
You can see the full specification of UTF-8 summarized on the Wikipedia page.
Notice that characters between 0x00 and 0x7F are stored as-is, as one byte, but characters 0x80 through 0x07FF are stored as a two-byte sequence, 110xxxxx 10xxxxxx, where the 'x' represent the sequential eleven bits used for values in that range.
Your char 128 is in that range, with bit sequence 00010000000. So the corresponding two-byte UTF-8 sequence is 11000010 10000000, or -62, -128 if you interpret those as signed 8-bit characters.
(The Java version of UTF-8 is actually slightly different than what's on the Wiki for some special characters, but it doesn't affect this string!)
QUESTION
I want to implement a datastructure in native memory using the Foreign Memory Access API of Project Panama.
In order to do that I need an underlying Object array (Object[]) for the entries.
In all the examples for the Foreign Memory Access API, MemorySegments are only used to store and retrieve primitives like so:
...ANSWER
Answered 2021-Jun-12 at 13:54Is there a way to store non primitives in a MemorySegment (e.g. Object)?
No, at least not directly. Objects are managed by the Java runtime, and they can not be safely stored in native memory (for instance because the garbage collector would not be able to trace object references inside objects in native memory).
However, as noted in the comments, for your purposes it might be enough to store the data inside an object in native memory. For instance, if an object contains only primitive fields (though, the same could be done recursively for object fields), it would be possible to write each such field separately to native memory. For example (with the JDK 16 API):
QUESTION
I want to make a getter that doesn't allow the caller to edit the returned object.
Using a List as an example (though I would like the answer to apply to any other type as well), this is the usual approach for returning and for editing an attribute:
ANSWER
Answered 2021-Jun-11 at 16:00You can have getStrings return an unmodifiable list.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install primitive
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page
