Container Class vs Class - C

I'm new to programming and have only now discovered this assignment.

I've looked on the internet and in my book, but I still don't understand the difference between a Container Class and a Class in C++.

How could I make a family class with 20 individual objects all at once?

Jul 28, 2022 in C++ by Nicholas
• 7,760 points • 355 views

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Declare abstract class in c++

An abstract class is one that is intended to be used as a base class . At least one pure virtual function exists in an abstract class. A pure virtual function is declared in the class declaration by using a pure specifier (= 0) in the declaration of a virtual member function. Here is an example of an abstract class: class AB { public: virtual void f() ...READ MORE

answered May 31, 2022 in C++ by Damon
• 4,960 points • 562 views

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C++ - Overloading vs Overriding in Inheritance

In C++, a derived class's method only overrides the base class's method if their declarations match (I say "match," but I'm not sure what the formal term is). That is, all arguments must be of the same type, with the same const qualification. If there are any mismatches, the derived class's method hides all methods with the same name rather than overriding. This is what the "ERROR" in your image is attempting to convey. So, in that image, / overrides in a comment is incorrect and misleading. Yes, many C++ instructors are unaware of these somewhat esoteric details. Furthermore, if you want to override, your base class's method must be virtual; otherwise, polymorphism will not work. . We could also say that the derived-class method hides the base-class method if it wasn't virtual. The part about hiding, on the other hand, has almost no meaning here; what this term really means is that you're not in charge. Furthermore, overloading is the presence of multiple methods with the same name but different signatures, as you may have noticed. To be useful, they must all be present in the derived class; otherwise, they will be hidden if the derived class only has one method, fa1, and the other fa1 are in the base. There is, however, a syntax sugar that "copies" all fa1 from base to derived, removing all the hidden semantics: class A { public: void fa1(); ...READ MORE

answered Jun 7, 2022 in C++ by Damon
• 4,960 points • 822 views

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C++ - Overloading vs Overriding in Inheritance

In C++, a derived class's method only overrides the base class's method if their declarations match (I say "match," but I'm not sure what the formal term is). That is, all arguments must be of the same type, with the same const qualification. If there are any mismatches, the derived class's method hides all methods with the same name rather than overriding. This is what the "ERROR" in your image is attempting to convey. So, in that image, / overrides in a comment is incorrect and misleading. Yes, many C++ instructors are unaware of these somewhat esoteric details. Furthermore, if you want to override, your base class's method must be virtual; otherwise, polymorphism will not work. We could also say that the derived-class method hides the base-class method if it wasn't virtual. The part about hiding, on the other hand, has almost no meaning here; what this term really means is that you're not in charge. Furthermore, overloading is the presence of multiple methods with the same name but different signatures, as you may have noticed. To be useful, they must all be present in the derived class; otherwise, they will be hidden if the derived class only has one method, fa1, and the other fa1 are in the base. There is, however, a syntax sugar that "copies" all fa1 from the base to the derived. class A { public: void fa1(); ...READ MORE

answered Jun 7, 2022 in C++ by Damon
• 4,960 points • 1,048 views

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In C++, what is a virtual base class?

When employing multiple inheritance, virtual base classes are used to prevent several "instances" of a particular class from appearing in an inheritance hierarchy. Consider the following example: class A { public: void Foo() {} ...READ MORE

answered Jun 10, 2022 in C++ by Damon
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What is a Class and Object in C++?

A Class is like a blueprint, an ...READ MORE

answered Jun 21, 2022 in C++ by Damon
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*this vs this in C++

This is a pointer, and *this is a pointer that has been dereferenced. If you had a function that returned this, it would be a pointer to the current object, but a function that returned *this would be a "clone" of the current object, created on the stack unless you defined the method's return type to be a reference. A small application that demonstrates the difference between working with copies and working with references: #include <iostream> class Foo { public: ...READ MORE

answered Jun 28, 2022 in C++ by Damon
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C++ "Object" class

No, there is no generic base class&nb ...READ MORE

answered Jun 2, 2022 in C++ by Damon
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What are access specifiers? Should I inherit with private, protected or public?

I'm not sure what access modifiers signify ...READ MORE

Jul 22, 2022 in C++ by Nicholas
• 7,760 points • 361 views

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What is the difference between a concrete class and an abstract class?

I'm learning C++, but I'm having trouble ...READ MORE

Jul 26, 2022 in C++ by Nicholas
• 7,760 points • 484 views

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C++ - upcasting and downcasting

As an example: Shouldn't the second d.print() call during upcasting print "base"? Isn't it a "d" derived object that has been upcasted to a base class object? And what advantages does downcasting have? Could you describe upcast and downcast in more detail? #include <iostream> using namespace std; class Base { public: ...READ MORE