inheritance

问题 In a previous question I ask how to handle large forms, outcome was Single Table Inheritance (STI) or CTI, Inheritance mapping. I've has chosen for CTI. Now i'm dealing how to create the form with CTI. A quick overview what kind or relation there are. Each inspection could have one or more surfaces . Each surface consists of many sub entities, like: surface_leakage , surface_tension or surface_slope . As you could see surface has the CTI with sub entities. Some fields overlap (put them in

问题 I'm writing some code for a program that will be able to run some software, read the inputs/outputs and do some data processing along the way. For example: (this is not the real case, but just to give an idea) class MusicFile(object): extension = [""] def setup(self): #set up the data def runsoftware(self): #play the song class MP3(MusicFile): extension = [".mp3"] def setup(self): #setupMP3file def runsoftware(self): #runMP3software I have about 4 general classes, and then file extensions

问题 I'm writing some code for a program that will be able to run some software, read the inputs/outputs and do some data processing along the way. For example: (this is not the real case, but just to give an idea) class MusicFile(object): extension = [""] def setup(self): #set up the data def runsoftware(self): #play the song class MP3(MusicFile): extension = [".mp3"] def setup(self): #setupMP3file def runsoftware(self): #runMP3software I have about 4 general classes, and then file extensions

问题 I'm writing some code for a program that will be able to run some software, read the inputs/outputs and do some data processing along the way. For example: (this is not the real case, but just to give an idea) class MusicFile(object): extension = [""] def setup(self): #set up the data def runsoftware(self): #play the song class MP3(MusicFile): extension = [".mp3"] def setup(self): #setupMP3file def runsoftware(self): #runMP3software I have about 4 general classes, and then file extensions

问题 I wanted to force children to call parent constructor and found this answer which seems to do the job fine. However, I'm a bit unsure if what I'm doing is safe. I have this: # Copied from answer linked above class meta(type): def __init__(cls,name,bases,dct): def auto__call__init__(self, *a, **kw): for base in cls.__bases__: base.__init__(self, *a, **kw) cls.__init__child_(self, *a, **kw) cls.__init__child_ = cls.__init__ cls.__init__ = auto__call__init__ # My code import unittest class

问题 I wanted to force children to call parent constructor and found this answer which seems to do the job fine. However, I'm a bit unsure if what I'm doing is safe. I have this: # Copied from answer linked above class meta(type): def __init__(cls,name,bases,dct): def auto__call__init__(self, *a, **kw): for base in cls.__bases__: base.__init__(self, *a, **kw) cls.__init__child_(self, *a, **kw) cls.__init__child_ = cls.__init__ cls.__init__ = auto__call__init__ # My code import unittest class

问题 I am using Swashbuckle v3.0. I am not sure weather this is a bug or not, but polymorphism is not working as it should. I have the following classes: BasePersonDocumentDto { Id, Number } IdentityDto: BasePersonDocumentDto { } PassportDto: BasePersonDocumentDto { VisaNumber } To apply Inheritance & Polymorphism, i have created a schema and document filters. I followed this answer Below are the code i used. public class PolymorphismSchemaFilter<T> : ISchemaFilter { private List<Type>

问题 On possible duplicate: This thread is not asking how to extend a final class. It is asking why a class declared as final could possibly extend another class. From this thread: A final class is simply a class that can't be extended . However, I have a helper class which I declared to be final and extends another class: public final class PDFGenerator extends PdfPageEventHelper { private static Font font; private PDFGenerator() { // prevent instantiation } static { try { BaseFont baseFont =

问题 Im having trouble inheriting an interface containing a method/fun of a base type, that i would like to override as a subtype in the class implementing it. So far i have the interface interface IModel { fun convert(dataModel: BaseDataModel) } And the class implementing it: class SettingsModel: IModel { override fun convert(dataModel: BaseDataModel) { // Conversion of models here } } And i also have the SettingsDataModel which is: class SettingsDataModel: BaseDataModel() { } What i'm trying to

问题 I know this question was asked several time, but i don't find how to resolve it. I get this error when i'm trying to build my project: error LNK2019: unresolved external symbol "public: virtual __thiscall IGameState::~IGameState(void)" (??1IGameState@@UAE@XZ) in function "public: virtual __thiscall MenuState::~MenuState(void)" (??1MenuState@@UAE@XZ) Here is my code: IGameState.h class IGameState { public: virtual ~IGameState(); virtual void update() = 0; virtual void render() = 0; };