Can someone post an example of how I get an instance variable value that is a double? I tried using the object_getIvar() function but that didn't go very well because it seems like this function is only good for variables that return objects and not scalar data type. thanks in advance, fbr ...
Given the following models: class Graph(models.Model): owner = models.ForeignKey(User) def __unicode__(self): return u'%d' % self.id class Point(models.Model): graph = models.ForeignKey(Graph) date = models.DateField(primary_key = True) abs = models.FloatField(null = True) avg = models.FloatField(...
I want to create class instance inside itself. I tried to it by this way: class matrix: (...) def det(self): (...) m = self(sz-1, sz-1) (...) (...) but I got error: m = self(sz-1, sz-1) AttributeError: matrix instance has no __call__ method So, I tried to do it by this way: class matrix: ...
Hello. While choosing between shared hosting and Cloud hosting I have always been inclined to go for the latter. However one aspect that always worries about Cloud is security. Here I'll try to be more specific. When I go for shared hosting, the foundation softwares are already there for me and they are configured to the best suitable...
Im getting fairly confused as the book im reading is delving into the NSNumber class and talks about all the different methods you can call on it. I have a couple questions: 1.) Do you not have to call a typical alloc or init on foundation classes? 2.)in what cases would you use, say, numberWithChar: as opposed to initWithChar (i thin...
I got trouble in creating special instance of member template function of non-template class. I have, for example, class A with template member function F: class A {public: template <class T> int F (T arg) const; .... } and want to have a special instance of this template function F for type B: class B; ... template...
Hi, I am very new to Rails so this will probably seem basic to most of you. I am having trouble getting instance variables from one of my controller methods to show in my view. I am trying to get the first 10 entries of a MySQL table called Odds to show up in a table on my index view. Here is my Model: class Odds < ActiveRecord::B...
I need to check if there exists an instance of class_A ,and if there does exist, get that instance. How to do it in PHP? As always,I think an simple example is best. Now my problem has become: $ins = new class_A(); How to storing the instance in a static member variable of class_A when instantiating? It'll be better if the instanc...
I'm running into some type of a scope issue that's preventing instance variables from being properly initialized by helpers called from the view. #sample_controller.rb class SampleController < ApplicationController def test end end #application_controller.rb helper_method :display def display if not defined? @display return ...
Any idea if there is a way to make the following code to work class Test(object): def __init__(self, var): self.var = var def changeme(self): self = Test(3) t = Test(1) assert t.var == 1 t.changeme() assert t.var == 3 is something like the following safe to use for more complex objects (like django models, t...
Hello, I'm pretty sure that this question is very noob but I'm not used to C++. I have a .hpp for class definition and a .cpp for class implementation. I have some private instances on the class, for example: class Test { Test(void); private: SomeClass anInstance; }; To create the instance and call the constructor do...
Hi guys I know this is a pretty well posted thing to do, but I still can't work it out. I have an instance method saveAllDataJobs in Jobs.m. - (void) saveAllDataJobs { ... } I am in DetailViewController.m and I want to run the method saveAllDataJobs, which is in Jobs.m. What precisely do I need in order for this code to run. Sorry f...
I am using an instance class from a third-party DLL, and I need to do a deep copy on a particular instance. The class is not marked as Serializable, and therefore I can not use this suggested method using BinaryFormatter. How can I get a deep copy of this object without using serialization? ...
I've created my own Delegate for a ObjC class. The class itself deals with Core Data operations. Delegate methods are used to inform other classes about changes that happened to the datastore. The class that deals with the datastore is called Datastore and it's delegate is called DatastoreDelegate. A UIViewController of mine (ContactsVie...
How do I prevent Multiple forms from opening? I do .show on the form but the user can click the main form and the button again and another instance of form opens. ...
Hello, class A: def __get(self): return self._x def __set(self, y): self._x = y def __delete_x(self): print('DELETING') del self._x x = property(__get,__set,__delete_x) b = A() # Here, when b is deleted, i'd like b.x to be deleted, i.e __delete_x() # called (and for immediate consequence, "DELETING" printed) del b Tha...
In my application... to navigate between winforms what i do is that i make an object of the form that needs to be shown and i use Register reg = new Register() reg.show(); this thing has two problems if i do it with a button, more than one instance of same form could be opened. if i close through which the instance was created, th...
I was using SQL server 2005 express edition and, therefore was limited by a data base 4 giga size. I decided to install SQL server 2005 developper (64bits) in order to be able to go beyond 4 gigabytes data base size. The installation program run with no error message on a Windows 7 64 bits, but did not install the SQL server Management ...
Hello, I have always wondered why all apple code samples use code like this: UINavigationController *aNavigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController]; self.navigationController = aNavigationController; [self.view addSubview:[navigationController view]]; [aNavigationCont...
Hi everyone I have the following problem: I get an instance of a class passed and want to know the name of the class of this instance. Any guess how to get this? Thank you very much! ...