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This commit is contained in:
Jidong Xiao
2025-04-14 19:30:21 -04:00
committed by JamesFlare1212
parent 114bc00e8b
commit 12e95dedfc
1 changed files with 5 additions and 5 deletions
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10
lectures/26_inheritance_II/README.md
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@@ -90,7 +90,7 @@ public:
}; };
``` ```
## 26.2 Introduction to Polymorphism ## 26.3 Introduction to Polymorphism
- Let’s consider a small class hierarchy version of polygonal objects: - Let’s consider a small class hierarchy version of polygonal objects:
@@ -132,7 +132,7 @@ they must be redefined in a derived class.
– Objects of abstract types may not be created — only pointers to these objects may be created. – Objects of abstract types may not be created — only pointers to these objects may be created.
- Functions that are specific to a particular object type are declared in the derived class prototype. - Functions that are specific to a particular object type are declared in the derived class prototype.
## 26.3 A Polymorphic List of Polygon Objects ## 26.4 A Polymorphic List of Polygon Objects
- Now instead of two separate lists of polygon objects, we can create one “polymorphic” list: - Now instead of two separate lists of polygon objects, we can create one “polymorphic” list:
@@ -153,7 +153,7 @@ polygons.push_back(t_ptr);
Note: We’ve used the same pointer variable (p_ptr) to point to objects of two different types. Note: We’ve used the same pointer variable (p_ptr) to point to objects of two different types.
## 26.4 Accessing Objects Through a Polymorphic List of Pointers ## 26.5 Accessing Objects Through a Polymorphic List of Pointers
- Let’s sum the areas of all the polygons: - Let’s sum the areas of all the polygons:
@@ -192,7 +192,7 @@ for (std::list<Polygon*>::iterator i = polygons.begin(); i!=polygons.end(); ++i)
} }
``` ```
## 26.5 Exercise ## 26.6 Exercise
What is the output of the following [program](exercise.cpp)? What is the output of the following [program](exercise.cpp)?
@@ -233,6 +233,6 @@ int main() {
} }
``` ```
## 26.6 Exercise ## 26.7 Exercise
What is the output of the following [program](virtual.cpp)? What is the output of the following [program](virtual.cpp)?