logo
down
shadow

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 :


Share : facebook icon twitter icon
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;
}
@end

@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
Related Posts Related Posts :
  • My program crashes when I try to change private values from an object
  • Unordered_map with custom class as key
  • Strict aliasing rules broken with templates and inheritance
  • C++ Derived Class Override Return Type
  • singly linked list c++ constructor, destructor and printing out
  • How to clone class with vector of unique_ptr to base class
  • error: no match for operator
  • std::vector doesnt accept my struct as template
  • selection of people's contours
  • how to fix the (Error using mexOpenCV) on matlab?
  • Is or was there a proposal for c++ to use the context for short enum values?
  • Fair assumptions about std::hash implementations
  • undefined reference to libusb using cyusb
  • Function returns null pointer instead of address
  • C++17 copy elision and object destruction
  • Input multiple strings via operator>> c++
  • Avoiding overflow boost container
  • How to Write a Lambda Wrapping a Function with Optional Return Value
  • Partial specialization with more template parameters
  • How to convert fixed size array to pointer on pointer array
  • Memory leak in const member constructor with tag dispatching
  • C++ function with a generic and optional class
  • Custom QGraphicsItem That Contains Child QGraphicsItems
  • Are There Restrictions on What can be Passed to auto Template Parameters?
  • Rotating line inside rectangle bounds
  • Why do I need dynamic memory allocation if I can just create an array?
  • How can I convert a text file into a form that MPI_Bcast can send?
  • How to get array of all `this` of an instance
  • Using pointers as parameters
  • Automatic type deduction with const_cast is not working
  • Why does std::is_rvalue_reference not do what it is advertised to do?
  • Function Template Specialization with Forward Declared Type
  • template deduction failed in vector
  • Is there a signed `sizeof` alternative in Qt
  • clarification on overloading the -> operator
  • What is __m128d?
  • QtConcurrent: why releaseThread and reserveThread cause deadlock?
  • Function receiving different value than passed
  • Can C++ close a '''fstream''' variable after '''.close()'''?
  • Is it necessary to overload operator in this specific case
  • Comparing an element of a string array with a string
  • how to dereference a pointer of a map of pointers to objects in c++
  • How recursive function control flow change for static variable?
  • SDL 2 blitting BMP File
  • Why does an extremely large value cause this code to repeat infinitely?
  • Function returning different value than what is in function body before return statement
  • Struggling with including Headers in another header file (C++)
  • WebViewProcessControl initialization crash
  • C++ exception 0xC00000FD: Stack overflow (parameters: 0x00000001, 0x00C02F30)
  • What's difference between forward and move in the constructor of class?
  • C++: Is it possible to condense `bool` objects within the same byte?
  • I cant understand this access modifier
  • Boost Spirit X3: Collapsing one-element lists
  • How can I add a char to an istringstream?
  • Wrapping variadic templates in pybind11
  • C++ referencing instances created within a function's scope
  • c++11 invoke a type conversion while moving an object
  • Generate a fixed number of 1s on random positions
  • OpenCL C++ wrapper. Is it possible to extract the platform and device from a Context class?
  • C++: convert chrono::high_resolution_clock to time_t
  • shadow
    Privacy Policy - Terms - Contact Us © bighow.org