Get Instance ID of an Object in PHP

I've learn a while ago on StackOverflow that we can get the "instance ID" of any resource, for instance: var_dump(intval(curl_init())); // int(2) var_dump(intval(finfo_open())); //...

MEF: Component authentication

I am building a Windows (Service) application that, in short, consists of a "bootstrapper" and an "engine" (an object loaded by the bootstrapper, which transfers control to it, and then performs...

How to JSON serialize sets?

I have a Python set that contains objects with __hash__ and __eq__ methods in order to make certain no duplicates are included in the collection. I need to json encode this result set, but passing...

Objects.hash() vs Objects.hashCode(), clarification needed

Since Java 7, we have o.hashCode(); Objects.hashCode(o); Objects.hash(o); The first two are roughly the same with the null check, but what is last one? When a single object reference is...

Why does Array.prototype.reduce not have a thisObject parameter?

Javascript Array methods such as forEach have a thisArg parameter, which is used as the context for invoking the callback: array.forEach(callback[, thisArg]) as do every, some, filter and map....

Using object as key in dictionary in Python - Hash function

I am trying to use an object as the key value to a dictionary in Python. I follow the recommendations from some other posts that we need to implement 2 functions: __hash__ and __eq__ And with...

What's a good recipe for overriding hashcode in Dart?

I find myself wanting to override hashcode and == for an object, and I'm wondering if there are best practices for how to implement a hashcode that depends on multiple attributes, and it seems...

Convert object array to hash map, indexed by an attribute value of the Object

Use Case The use case is to convert an array of objects into a hash map based on string or function provided to evaluate and use as the key in the hash map and value as an object itself. A common...

How WPF DependencyProperty pickup the key to distinguish each instance of an object and seek the values of the DependencyProperty?

From google, a lot of articles said that DependencyProperty is static because it has a KeyValue mechanism to maintain the value of each instance of the object. But the problem is that, if we call...

ActiveRecord::RecordNotUnique global handling

I am trying to figure out a graceful way to handle a ActiveRecord::RecordNotUnique exception globally for all my ActiveRecord code. I know about the validates_uniqueness_of validation but I want...

Why `try ... except` is faster than `if`?

In my code, I have a list l, and I'm creating a dictionary of lists from it. (I'm grouping objects which have the same key). Implementing it via both a try statement and a if condition, I've...

How to return ordered key/value pairs from function?

I have an object ( array of hashes ) and I need to convert it into ordered key value pairs. This is object: var places_info = [ {"place_id":180,"name":"Abc","city":"Gotham"}, ...

How is the Git hash calculated?

I'm trying to understand how Git calculates the hash of refs. $ git ls-remote https://github.com/git/git ...

TypeError: 'Series' objects are mutable, thus they cannot be hashed

I know this error is common, I tried some solutions I looked up and still can't understand what is wrong. I guess it is due to the mutable form of row and row1, but i can't figure it out What am I...

Mutable Custom Class & Descriptor confusion

I am trying to understand how exactly descriptors work, especially in conjunction with custom mutable classes. A hopefully succinct abstract of my question: How do I make a custom class, which...

RDO install OpenStack queens all-in-one get stuck

When I use packstack to install openstack queens allinone, it got stuck at: # sudo packstack --answer-file pack-1534411186.txt Welcome to the Packstack setup utility The installation log file is...

Hash different for the same object, Swift, Hashable

Inside of the Hashable we can see: /// Hash values are not guaranteed to be equal across different executions of /// your program. Do not save hash values to use during a future execution. Why...

What is equivalent for Java Objects.hash and Objects.hashCode in C#

Moving from Java to C# developer. In Java, I used a lot of Objects.hash(array) and Objects.hashCode(object) to build hash code of an object in hashCode function. I can't find any equivalent for...

How to send audio data on rtsp backchannel?

I am working with an IP camera that supports Audio output(Audio Back-channel). What I want to do is The live stream my PC microphone audio data over provided RTSP URL so that what ever said at PC...

Unable to permit :file param in rails controller when trying to upload file using active storage

I'm running into a strange issue I've never seen before when setting up active storage where the file param isn't being permitted in my controller. Here's my model class Upload <...

Dynamoose model update with hash key

I'm trying to execute an update against a dynamoose model. Here's the docs on calling model.update Model.update(key[, updateObj[, settings]],[ callback]) key can be a string representing the...

How do i send a success status code to the front end using node.js?

I have recently started using node.js as my backend and I have successfully posted data to the database, the problem that I am facing now is telling the front end that data has been successfully...

Fatal: input format error for git mktree command

I am learning GIT using GIT Bash on Windows 10. And I was learning to create a GIT tree object. So, what I did was made two blobs of the following...

Codeigniter 4 reuse of CSRF token in AJAX modal

Scenario: I am developing CMS system and I wan to add some categories to the objects (pages, posts, media etc.). In my view, to save a new category I use HTML form placed in Bootstrap modal which...

Mongoose pre save hook: isModified() always returns true

I am using this pre save hook to hash the password before saving: userSchema.pre('save', async function (next) { const user = this if (!user.isModified('password')) { return...

laravel passport createToken not giving me the hashed token

laravel passport createToken not giving me the hashed token.It giving me this object from database table { "name": "Laravel Password Grant Client", "abilities": [ "*" ], ...

Inverting an Order-Preserving Minimal Perfect Hash Function in Better than O(K*lg N) Running Time

I am trying to find a more efficient solution to a combinatorics problem than the solution I have already found. Suppose I have a set of N objects (indexed 0..N-1) and wish to consider each subset...

Not able to create Azure Logic App workflow using Visual Studio Code

Trying to follow this tutorial. When I right click the workflow.json and select Open in Designer, I finally get the following message. [2021-11-11T16:25:32.880Z] A host error has occurred during...

How to add Autocomplete, Syntax Highlighting using Antlr4 grammar file functionality to Monaco Editor in my React application?

I am using the Monaco Editor in a react app in the following way: My monaco-editor.jsx looks like - import MonacoEditor from 'react-monaco-editor'; return ( <Flex> <Flex.Box> ...

Get byte representation of C++ class

I have objects that I need to hash with SHA256. The object has several fields as follows: class Foo { // some methods protected: std::array<32,int> x; char y[32]; long...