Questions tagged [concepts]
Concept programming is a programming paradigm focusing on how concepts, that live in the programmer's head, translate into representations that are found in the code space.
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How-to concept: Recognize features of an image and draw against
Might be silly, but I'm looking for a way to programmatically enrich images of vehicles with some technical, length measurements.
Images will always:
have a white background
have the same angle (side ...
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Implementing a selectable requirements with level of advancement in a web app [closed]
I'm doing a project to teach myself more about MongoDB and ASP.NET development and I am stuck. The project is a mockup of a JobBoard website, where Companies would post offers for potential Employees.
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How a VPS processes an incoming packet (conceptually)
I'm interested in understanding, conceptually (e.g., similar to how many of the concepts in networking are explained in textbooks like Tanenbaum's Computer Networks, or Kurose's Computer Networking), ...
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What is the terminology for "two or more different ways to represent the same data?"
For example, A system can accept a description of a symbol 🖤 as "black-heart" or "heart-black". As far as this system is concerned, both description are valid.
Is there a computer ...
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If an object x is an instance of a type T, then what is a type T for a concept C?
In concept-based programming (as in C++ concepts), I am wondering if there is a noun to say that:
A type T is an XXXX of a concept C.
in the same way we can say that:
An object x is an instance of ...
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What are the complexities of a binary search?
I recently asked a question on CodeReview SE where using a binary search was recommended, and the author of the answer proved that it was faster than my implementation. During my research on the topic,...
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Automatic deployment concept for remote iot devices
I am working on a relatively large project that could include +1000 iot devices, in this case probably a Raspberry Pi. So far I only experimented with ~ 20 - 30 devices but the concept should be the ...
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How to maintain and deploy a poc (Proof Of Concept) version of an app?
In our organization we sometimes have to create a poc (proof of concept) to either validate or invalidate the way to go. Currently we're having a discussion around how to embed this within our ...
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What's an abstraction?
I know this is a very basic topic, but I'm curious why an abstraction in programming is always defined as a simplification/hiding of some functionality. Let's say I wrote a set of functions that let ...
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What is the difference between the terms 'Virtual' and 'Logical'?
What do people mean when they say 'Logical' in terms like Logical separation, Logical partition, Logical grouping etc. in software ? I know what 'Virtual' means, it means something that does not ...
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Can I use singleton in a Flyweight factory and still be a valid GoF implementation?
For teaching purposes, I am trying to create a "something useful" example of Flyweight pattern using PHP.
My idea was load some "intrinsic" data from a csv (link) to a pool and ...
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Strategies in cloud migration [closed]
A few months ago I found a presentation with slides about the benefits of migrating to the cloud. I think that the presentation was maybe quite old but I think that it started with arguing that ...
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Builder Pattern: Is it acceptable to use "passing-by-reference" on Director methods?
For teaching purposes, I am trying to create a PHP implementation of a conceptual example of Builder Pattern:
First of all, some products:
class Product1 {
private string $attribute1;
...
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Responsibility-driven design
I am quite confused about the responsibility-driven design concept. Mainly because of ever so slightly changing definitions depending on the source.
Quoting BlueJ (the book I am learning that teaches ...
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Big-O Notation and Calculus [closed]
I was wondering if there are any calculus relationships implicit in Big-O notation.
For example, an algorithm linear according to Big-O notation reduces the size of the problem by a constant amount ...
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why does enumeration(enum) falls into category of non composite data type
I can see that integer or pointer are non-composite data types whereas record and objects are composite data type. Similarly i guessed enumeration is composite because integers or string values can be ...
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Help me with concept - rolling time window
I am designing some software for transportation companies (air, ground, water, etc). In these industries, you have rest rules where you need to get a certain amount of rest in between activities.
So ...
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Non-precise Input/Using Probability in File Compression
I'm a high school student interested in topics of computer programming.
Recently I became interested in file compression, and in my head I tried to combine this with a completely different part of ...
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How to understand and design functions with enumeration arguments that work in tandem with bitwise operators in C++ and Qt?
In the C++, there are 6 bitwise operators:
Symbol Operator
& bitwise AND
| bitwise inclusive OR
^ bitwise XOR (eXclusive OR)
<< left shift
>> right shift
~...
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Could you suggest mutually exclusive groups for String Extension methods or give a name for this one?
I am separating one of my method extension classes (i.e., StringExtensions) into regions, as has become confusing and it's difficult to see the wood for the trees. I have grouped the methods into four ...
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Using Observer Pattern to selectively act on events
I'm currently in the process of architecting a small RPG-style dungeon crawl (in Unity), and am a little stuck on how to update various objects when things change, while not updating unrelated objects....
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boolean size not defined in java: why?
I see size of boolean is not defined. Below are two statements I see at java primitive data size
not precisely defined
Further explanation says
boolean represents one bit of information, but ...
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Alternative to Actor model
My main experience working with multithread environment was using Scala, so if I had an object that was concurrently updated by multiple threads I always used Akka. Now working in Java environment I ...
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concept name(s): container of different types which can be used like a type
I am looking for the name(s) of a concept I heard of. I know that it does not exist in many programming languages, but I think it exists at least in C++.
Let me try to explain the concept.
Assume I ...
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What is an indexer?
The C# docs have a page on indexers, which appears to use "indexer" to refer to the construct required to enable instances of a class to be accessed via square bracket notation.
Indexers allow ...
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Multilayer security concept
I'm working on a security concept of a bigger project. It will be done with Spring,but that's actually not relevant right now.
The whole system is a hierarchical tree of computer nodes that run a ...
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When would you ever use a range not in the context of an array
I'm constantly trying to acquaint myself with different programming concepts, and I recently looked deeper into ranges.
In Haskell a range is basically a literal that expand to some kind of array.
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Using actor model, how can one program concurrent portion (critical section) of code as self contained nuggets?
Von neumann architecture allows sequential processing of instructions. So, a single core within a CPU executes instructions sequentially.
Consider, OS providing 1-1 threading model(here) in a multi-...
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What is the meaning of sharing state between processes?
The author here states that:
Share state between processes. Run a long running batch job in one Python interpreter (say loading a few million lines of CSV in to a Redis key/value lookup table) and ...
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Demonstrate Object Oriented Principles to non-programmers using physical props [closed]
We're about to embark on helping with a new-to-coding boot camp at my work, where people from other departments can come learn how to code from the IT folks. While this is great and all, I'm in a ...
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Why don't audio engines already process audio more realistically?
Generally game audio engines use a rather simple system for rendering audio:
1. position an audio source in space
2. apply effects on the audio clip depending on the area the object is in
3. shift ...
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Is it normal/acceptable to write down notes, thoughts, algorithms, decisions during coding and maintenance? [closed]
Some people have this problem that they cannot think without words. And writing down their thoughts and decisions is the most effective way to proceed.
So - is it normal and acceptable that I write ...
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Sockets (SignalR) vs Push notifications
I'm developing a Xamarin.Forms app with a .Net Web API backend. I definitely don't want to do long polls on my app to the server, but I need the app to remain updated with the server information.
I ...
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Find whether or not current location is near other locations with given radii
tl;dr: "Am I, with any given location, inside of any number of circles with varying radii"
Assume you have a database full of locations (coordinates) with arbitrary radii. Now the user enters and ...
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Role and importance of static method in OOP
Background
Thinking about OOP I feel that it binds data and behavior together, taking the real world example we already have array data type which is a collection of homogeneous type and in Java we ...
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Can the Linux kernel be described as a Server?
I am developping an Android application that is using NDK in order to access to data from the Linux kernel. As you may know, this is done using IPC (Inter Process Communication) through Android's ...
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Operation excution in terms of clock cycles
Typically for a single instrcution, 6 machine cycles are needed:
FETCH instruction
DECODE instruction
EVALUATE ADDRESS
fetch OPERANDS
EXECUTE oepration
STORE result
My concern is regarding the fifth ...
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VMs are not created on the same physical server to balance load?
When load reaches a certain level in IaaS environemnt, new VM instances are created to reduce load (scalability).
My Questions that these VMs are not created on the same physical server, right?
I ...
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What is the importance of WS-Addressing in SOAP?
I'm learning Web Services Addressing and SOAP, but I can't get the importance of WS-Addressing in SOAP. This is quoted from Wikipedia "standardized way of including message routing data within SOAP ...
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Why do we need namespaces when making XML serialization?
I know this might be a very basic question, but I'm new to XML serialization and spent hours trying to read different pages.
PS: this is a programming language independent question.
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Efficient Repeating Alarm Clock in Low Level Language like C
I was thinking about it and I was curious as to how one would code an efficient repeating alarm clock in C? Would you set an alarm time and then offset the time with the ms time equivalent of a day (...
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When to use "is a" or "has a"? [closed]
In my node.js application, I have a queue class which has push and pop methods and a data property. I have an Event class which handles an event and pushes it on to the queue.
If I think object ...
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Rationale for modern languages implement changeable global variables [closed]
Common sense seems to be that usage of global variables is bad, in particular if they are used as real variables (i.e. changing state; e.g. Why is Global State so Evil?).
How does it come then, that ...
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"Untriggered events" in Reactive Programming
The premise is that you have a Stream - a source of events spread over time.
You can connect to Stream and create a logical chain that will fire when a new event is emitted:
var button = document....
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Streams: what has happened after instantiation but before reading?
I'm trying to grok streams - my world is C# but I suspect the principles are general.
I understand the general principle of reading/writing bytes from/to a store. However, what I don't understand, ...
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OOP Principles in Customer and Account classes of a Bank
I am designing a Bank Application which deals with Customers having FD Accounts.
There are two approaches to this :
Approach 1
In this the customer has a list of accounts. The bank application ...
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What would happen if two different commits in one git repo had the same hash?
I know this has been said to be pretty much statistically impossible but that's a different question. What would be the consequences if against all odds, this did occur?
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Simulating fluid transfer in a pipe [closed]
I know this is a fairly large/broad category, but I've been racking my brain over the last few weeks on how to simulate fluid flowing through pipes. In the environment I'm working, I can have a single ...
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Reading using non-blocking IO on a fd asynchronously in C++ (moving from Node.js)
I'm trying to switch my brain from Node.js/Objective-C iOS programming to C++ programming, and it's a little bit taxing. Node.js and Objective-C with iOS do not have a run loop that I am supposed to ...
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Is "Unit testing" a form of formal method?
After some research, I understand that:
Formal method contribute to the reliability and robustness of a design. (ref : Wikipedia - Formal method)
Unit testing ensures us of the absence of errors ...
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