oop

问题 I try to dive deeper and understand the differences between Public | Private | Protected in a low level perspective, in C++. How are the differences between the three expressed in the memory? 回答1: private , public and protected does not cause members to be stored in specific regions of memory. The access is checked by the compiler. On the very lowest level, there is no difference. However, access specifiers do have an effect on what guarantees you get on the order in which class members are

问题 I try to dive deeper and understand the differences between Public | Private | Protected in a low level perspective, in C++. How are the differences between the three expressed in the memory? 回答1: private , public and protected does not cause members to be stored in specific regions of memory. The access is checked by the compiler. On the very lowest level, there is no difference. However, access specifiers do have an effect on what guarantees you get on the order in which class members are

问题 I want to keep track of all instances of a Particular Class in Excel-VBA, like Static Member in VB.Net. So here is my Class Module: ClassModule: clsClass Private pName as String 'Static pCount Commented as it doesnt work Property Set Name(arg as String) pName=arg End Property Private Sub Class_Initialize() 'pCount = pCount + 1 Commented as it doesnt work End Sub Public Function GetCount() GetCount = pCount End Function and my Generic Module Module: Module1 Sub ABC() Dim instance1 As New

问题 I want to keep track of all instances of a Particular Class in Excel-VBA, like Static Member in VB.Net. So here is my Class Module: ClassModule: clsClass Private pName as String 'Static pCount Commented as it doesnt work Property Set Name(arg as String) pName=arg End Property Private Sub Class_Initialize() 'pCount = pCount + 1 Commented as it doesnt work End Sub Public Function GetCount() GetCount = pCount End Function and my Generic Module Module: Module1 Sub ABC() Dim instance1 As New

问题 I want to keep track of all instances of a Particular Class in Excel-VBA, like Static Member in VB.Net. So here is my Class Module: ClassModule: clsClass Private pName as String 'Static pCount Commented as it doesnt work Property Set Name(arg as String) pName=arg End Property Private Sub Class_Initialize() 'pCount = pCount + 1 Commented as it doesnt work End Sub Public Function GetCount() GetCount = pCount End Function and my Generic Module Module: Module1 Sub ABC() Dim instance1 As New

问题 I want to keep track of all instances of a Particular Class in Excel-VBA, like Static Member in VB.Net. So here is my Class Module: ClassModule: clsClass Private pName as String 'Static pCount Commented as it doesnt work Property Set Name(arg as String) pName=arg End Property Private Sub Class_Initialize() 'pCount = pCount + 1 Commented as it doesnt work End Sub Public Function GetCount() GetCount = pCount End Function and my Generic Module Module: Module1 Sub ABC() Dim instance1 As New

问题 Code: class Fraction(object): def __init__(self, num, denom): self.numerator = num self.denominator = denom def main(): f = Fraction(1, 3) print type(f) if __name__ == "__main__": main() Output: <class '__main__.Fraction'> Question: Why is the type __main__.Fraction instead of just Fraction ? Why is there "." between __main__ and Fraction ? "." implies that Fraction is a sub-class of __main__ . But why? Even if I remove If __name__ == "__main__" from the code, I still get the same output:

问题 Code: class Fraction(object): def __init__(self, num, denom): self.numerator = num self.denominator = denom def main(): f = Fraction(1, 3) print type(f) if __name__ == "__main__": main() Output: <class '__main__.Fraction'> Question: Why is the type __main__.Fraction instead of just Fraction ? Why is there "." between __main__ and Fraction ? "." implies that Fraction is a sub-class of __main__ . But why? Even if I remove If __name__ == "__main__" from the code, I still get the same output:

问题 I want to write an extension method for a collection of objects that uses base class as a type requirement. I understand this is not necessarily the best way to do things, but I am curious because I'm interested in learning the nuances of the language. This example explains what I would like to do. public class Human { public bool IsHappy { get; set; } } public class Man : Human { public bool IsSurly { get; set; } } public class Woman : Human { public bool IsAgreeable { get; set; } } public

问题 I read that the constructor is like the first argument passed to the class, which makes sense to me since the parameters seem to be passed to the class via the __init__ method. For example, class NewsStory(object): def __init__(self, guid, title, subject, summary, link): self.guid = guid self.title = title self.subject = subject self.summary = summary self.link = link def get_guid(self): return self.guid def get_title(self): return self.title def get_subject(self): return self.subject def get