689 questions
2
votes
1
answer
94
views
Initializing Base class and member using the same pointer without UB
While reviewing some testing code, I have come across this situation:
Suppose we have these two classes:
class Project
{
public:
Project(std::string path);
~Project;
// [many more ...
- 4,138
0
votes
1
answer
95
views
How to replace base class in python [closed]
Here is the code:
class A: pass
class B: pass
class Example(A, B): pass
...a lot of method
# new class B called BPlus
class BPlus: pass
# want a new class Example that base on (A, BPlus) but ...
- 144
-2
votes
4
answers
96
views
How to downcast back a non-generic base-class object to a generic derived-class object at runtime (generic type unknown at compile time) [closed]
I have two classes: a non-generic base class Node and a generic derived class Node<T>. The nodes build a chained list, each node containing eventually a different data type.
public class ...
5
votes
5
answers
188
views
In C#, is inheritance from a method possible?
Now, if the title sounds weird to you, consider this code, I was reviewing today (simplified):
public class MyService(
IHttpClientFactory httpClientFactory) :
BaseService(), // WTF? a ...
- 15.8k
0
votes
1
answer
62
views
Circular imports/references between highly-dependent base-class and many sub-classes
Circular imports can drive you mad in Python. Here's one I'm too stupid to solve.
I have a base class with lots of functionality, that needs to emit itself, and also all kinds of its sub-classes:
# ...
- 47
0
votes
1
answer
26
views
How to simply distinguish Base<T> and Base<Int> in Derived<Int> during checking C++ code in clang AST?
I'm checking some C++ code pattern via clang AST and run into a problem. Consider following code:
template<typename T>
class Base { };
template<typename T>
class Derived1 : public Base<...
- 1
0
votes
0
answers
63
views
How do I apply the interface concept with the base-class in design?
I am now studying the concept of OOD and I have created a program for a pizza shop. The base class here is pizza. I want to put a spicy characteristic for pizza as an interface, but I find a problem ...
0
votes
1
answer
80
views
Serialize derived class from other project throws "The type was not expected. Use the XmlInclude or SoapInclude attribute ..."
Let's say i have two projects in Visual Studio. The Base project and a Derived project.
The base project contains a base class:
Public Class Car
Property Name As String
End Class
and a generic ...
- 97
0
votes
0
answers
75
views
Is it possible to provide default implementations of other traits through custom traits?
I have some questions from object oriented design. If I want to define a base class Path, which has two subclasses File and Dir, Path provides the validate method and the from_str method. For some ...
-3
votes
3
answers
94
views
does __new__ over ride __init__ in python
I have the following code:
class Demo:
def __new__(self):
self.__init__(self)
print("Demo's __new__() invoked")
def __init__(self):
print("Demo's ...
- 15.8k
1
vote
0
answers
268
views
How to use the html of the base class in angular
I want to create a base component in my angular app from which other components will extend. I want to use for html, ts and scss a seperate file. In this base component I want to create depending on ...
- 41
0
votes
1
answer
92
views
Is it ok to initialize final member in abstract base class using abtract method?
I wonder whether I could initialze a final field in an abstract base class with the result of an abtract method, which would be implemented by the derived class.
I understand that derived ctor would ...
- 69
1
vote
0
answers
64
views
Using a protected inner class as a base class of other class
In the section "11.9 Member access control" of the C++20 Standard there is provided an example (p.#7, example #2) of using a protected inner class of a class as a base class for a derived ...
- 313k
0
votes
0
answers
273
views
WinForms: Generic forms don't open anymore in designer in .NET 7
In order to be sure that it's .NET 7 (.NET Core) related, I created a project with .NET 4.7.2 with a generic base form and a derived one. Both can be opened and are shown properly. Only in .NET 7 it's ...
- 3,027
-1
votes
1
answer
45
views
Including base class variables in the initializer list in the derived class
My project is to create a dive logbook.
There is the DiveInfo base class and Equipment derived class.
The equipment may change from dive to dive, so obviously it needs to get the variables for ...
- 19