concept Questions
2
I am learning some modern C++20 features. One of them is concept. I have read https://en.cppreference.com/w/cpp/language/constraints and https://www.modernescpp.com/index.php/defintion-of-concepts ...
2
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Compiler Explorer link
template <typename T>
concept HasEq = requires(T t) {
{ t == t } -> std::convertible_to<bool>;
};
struct X {};
static_assert(not HasEq<X>);
//bool a = ...
2
React - what is a good analogy to wrap my head around Stateful and Stateless Components? I had trouble going through this abstract concept during my bootcamp and I still struggle to comprehend that...
1
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About RabbitMQ two concept is unknow to me, cluster and node ? what is different between them?
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I read many topics about OOP Design Patterns of GoF, but i am not sure about "Client" concept. So what is it? How can we realize it in our application. Thank!
Iliad asked 6/4, 2013 at 6:25
12
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My question might get closed, but I'm curious about whether it's always required to add an "else" part to every "if" statement in coding. A senior programmer told me, "You ...
Emetic asked 3/8, 2010 at 5:59
3
While I am trying to discerned the difference between the application logic and business logic I have found set of articles but unfortunately there is a contradiction between them.
Here they say t...
Anlage asked 17/8, 2015 at 11:16
6
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Helo,
A library like jQuery is fully loaded and comes with many functions that we may not use in our scripts. Am wondering if there is a way to say read my script find out all the jQuery functions...
Strappado asked 24/8, 2010 at 8:16
3
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Looking at the possible implementation of the same_as concept at https://en.cppreference.com/w/cpp/concepts/same_as i noticed something strange is happening.
namespace detail {
template< class ...
Thithia asked 22/10, 2019 at 17:2
2
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Per cppreference, the partial ordering of constraints over subsumption is used to determine "the best match for a template template argument". And in the example section, the option that ...
2
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In my business we have a "Data Store" where data is stored (e.g. database, flat file, etc) and a "Data Provider" who delivers the data (e.g. human, sensor, etc).
To model this in UML is no proble...
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I've set up Node.js and Nginx on my server. Now I want to use it, but, before I start there are 2 questions:
How should they work together? How should I handle the requests?
There are 2 concepts ...
4
I am new guy to Demandware and I am switching from Magento to Demandware.
Demandware is not opensource I am not getting proper tutorials, stuff to understand the concepts of it.
I am from Magento...
Mayoralty asked 9/5, 2016 at 8:55
2
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Since concepts are defined as compile-time predicates, is it also possible to actually reuse these predicates for compile-time algorithms? For example would it be possible to check whether all type...
Comparison asked 15/11, 2019 at 11:11
3
So, I had an argument with my professor earlier defending that NULL is not a pointer, but he kept on insisting that it is because there is such a thing as NULL pointer. So, here I am now a little b...
Vandalism asked 4/4, 2019 at 16:16
1
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#include <vector>
#include <algorithm>
#include <range/v3/all.hpp>
using namespace ranges;
int main()
{
auto coll = std::vector{ 1, 2, 3 };
std::for_each(coll.begin(), coll.en...
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I am confused about the concept of Distributed Cache. I kinda know what it is from google search. A distributed cache may span multiple servers so that it can grow in size and in transactional capa...
3
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I have Java EE application with about 10 EntityManagers (number of EMs will probably increase). My application also contains many stateless, statefull and message driven beans.
Rather than inject ...
Parish asked 4/12, 2012 at 9:0
3
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Can a pure function call an external method?
for example:
class Dog {
function jump(name) {
return "a dog named " + name + " jumped!"
}
function jumpTwice(names) {
var result = [];
for (va...
Bouie asked 14/9, 2016 at 18:57
2
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I know this is a bit of a basic question, but I am a little confused and couldn't find the complete answer on Google.
I know that the difference has to deal with how permanent and malleable a secti...
1
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In short:
Is there a way I can feed a General templated class with something that only represent an enum type? Something like:
template <typename T> struct General {};
struct EnumSpecific :...
7
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I write a 2D platformer game where I need rooms with (maximum 4) doors. I write it in Java, but the language is irrelevant.
Each room can have 4 doors, on the top, bottom and sides. I call them NO...
2
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#include <stdio.h>
int num = 0;
int main(int argc, char*argv[]){
int pid;
pid = fork();
printf("%d", num);
if(pid == 0){ /*child*/
num = 1;
}else if(pid > 0){ /*parent*/
num = 2;
...
5
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I'm having the idea of writing a program using Python which shall find a lyric of a song whose name I provided. I think the whole process should boil down to couple of things below. These are what ...
Plangent asked 11/1, 2013 at 23:13
4
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Fields are variables within a class or struct, local variables sit within a method and global variables are accessible in every scope (class and method included).
This makes me think that fields ...
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