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Multiple class object share common variable


Multiple class object share common variable

By : jnk911
Date : November 21 2020, 11:01 PM
will help you The pointer should work, but the problem with it is that you end up not knowing who is responsible of cleaning up that shared object. And further, you need to modify a lot of consutrctors and classes when your shared class is even used in more than ClassA.
When data is shared across multiple (likely also different) classes, the Singleton pattern is useful. A very good example is the accepted answer here: C++ Singleton design pattern
code :


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Class design for two objects that derive from the same class but share no common methods

Class design for two objects that derive from the same class but share no common methods


By : jelly999
Date : March 29 2020, 07:55 AM
should help you out It sounds as if methods such as drawOnScreen(), getMetrics(), getCodePoint() would be good candidates for polymorphic behaviour.
How to share common class with non-common functions among components?

How to share common class with non-common functions among components?


By : Hiroki Wakasugi
Date : March 29 2020, 07:55 AM
hop of those help? If your components implement a common interface, you can pass the component into the handle method:
code :
class Component {
  virtual void executeFunctionABC() = 0;
  virtual void executeFunctionDEF() = 0;
}

class MessageA : public Message {
  void handle(Component *c) {
    c->executeFunctionABC();
  }
}
message->handle(this);
class MessageA : public Message {
  void handle(ComponentA *c) {
    c->executeFunctionABC();
  }

  void handle(ComponentB *c) {
    ...
  }
}
class MessageHandler {
  virtual void handle(MessageA *msg) = 0;
  virtual void handle(MessageB *msg) = 0;
}

class MessageA : public Message {
  void handle(MessageHandler *handler) {
    handler->handle(this);
  }
}

class ComponentA : public MessageHandler {
  void handle(MessageA *msg) {
    executeFunctionABC();
  }
}
Share a class variable across multiple processes in python

Share a class variable across multiple processes in python


By : Badblues
Date : March 29 2020, 07:55 AM
I hope this helps . Because of python's GIL, multiprocessing can only be used whith completely separate tasks, and no shared memory. But you still can make it happend by using multiprocessing shared Array/Value:
from https://docs.python.org/2/library/multiprocessing.html#sharing-state-between-processes
code :
from multiprocessing import Process, Value, Array

def f(n, a):
    n.value = 3.1415927
    for i in range(len(a)):
        a[i] = -a[i]

if __name__ == '__main__':
    num = Value('d', 0.0)
    arr = Array('i', range(10))

    p = Process(target=f, args=(num, arr))
    p.start()
    p.join()

    print num.value
    print arr[:]
num.acquire() # get the lock
# do stuff
num.release() # don't forget to release it
Gradle : Multiple subtasks share the same extension variable object

Gradle : Multiple subtasks share the same extension variable object


By : Colin Elmore
Date : March 29 2020, 07:55 AM
I wish this helpful for you You're setting the extension property in the configuration phase which always runs. So each invocation is overriding the previous. To set it in the execution phase, use a doFirst { ... } block. Eg:
code :
task dummyCI(type: DummyTask) {
    doFirst {
        dummy {
            env = 'ci'
        }
    }
}
Changing multiple pages' CSS that share a common class

Changing multiple pages' CSS that share a common class


By : Iso-Doss
Date : March 29 2020, 07:55 AM
I wish this help you You could create a new class and apply it to only the places you want changed.
code :
.pad-class{
  padding:5px;
}

<div class="other-class pad-class"></div>
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