C++ templated class implementation of the multiton pattern

C++ templated class implementation of the multiton pattern

By : user3849785
Date : October 21 2020, 11:12 PM
seems to work fine 1) Personal preference, but I'd reverse the order of the template parameters and default the Key to std::string (if that's what you'll use most)
code :

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Elegant and 'correct' multiton implementation in Objective C?

Elegant and 'correct' multiton implementation in Objective C?

By : user1865876
Date : March 29 2020, 07:55 AM
This might help you I find singletons a bad idea and this looks about four times as horrible. The code is quite complex, you can be sure of spending a nice few hours chasing subtle bugs in it and you will probably never feel comfortable about it. That’s no good. You should throw this abomination away and wire your objects together in some other way that doesn’t require so much thinking.
If you like patterns, you can use something akin to Factory pattern to wire your objects. The Factory will take care of creating those two instances and passing them wherever needed. And the Factory will be a lot more simple than Multiton:
code :
@interface Factory : NSObject {
    Foo *foo1, *foo2;

@implementation Factory

- (id) init {
    [super init];
    foo1 = [[Foo alloc] init];
    foo2 = [[Foo alloc] init];
    return self;
@implementation Factory

- (id) wireSomeClass {
    id instance = [[SomeClass alloc] init];
    [instance setFoo:foo1];
    [instance setAnotherDependency:bar];
    return [instance autorelease];
Thread-safe multiton pattern

Thread-safe multiton pattern

By : Meharnath B
Date : March 29 2020, 07:55 AM
will be helpful for those in need It is absolutely not thread-safe. Here is a simple example of the many, many things that could go wrong.
Thread A is trying to put at key id1. Thread B is resizing the buckets table due to a put at id2. Because these have different synchronization monitors, they're off to the races in parallel.
code :
Thread A                      Thread B
--------                      --------
b = key.hash % map.buckets.size   

                             copy map.buckets reference to local var
                             set map.buckets = new Bucket[newSize]
                             insert keys from old buckets into new buckets

insert into map.buckets[b]
Templated class with templated static member function no match for prototype in implementation

Templated class with templated static member function no match for prototype in implementation

By : Ayushi Jain
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , When defining a template member from a template class, you have to write template <...> twice:
code :
template <class T>
template <class It>
nsp::A<T> nsp::A<T>::from(It begin, It end){
    nsp::A<T> tmp;

    if(begin != end)
        tmp.elem = static_cast<T>(*begin);

    return tmp;
Enum Multiton Pattern

Enum Multiton Pattern

By : Santosh Hiregoudar
Date : March 29 2020, 07:55 AM
seems to work fine The description of the pattern you linked to doesn't have a fixed set of keys, so I'm not sure you could call it a Multiton if you have a fixed set of keys. But if we accept it, then yes, enum instances each are a singleton.
Remember that enums are objects : they can have state and methods.
Singleton Pattern: Multiton?

Singleton Pattern: Multiton?

By : Patrick Blank Cassol
Date : March 29 2020, 07:55 AM
around this issue I am confused as to how the multiton implementation of the singleton pattern works. I am aware that the definition of a singleton is as follows: ,
Multiton Design Pattern
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