From 2a3aa83adf2daa629cd216642aa6db34b669f6a3 Mon Sep 17 00:00:00 2001
From: Aleksandar Karakas <aleksandar.karakas@tugraz.at>
Date: Thu, 25 Mar 2021 15:48:23 +0100
Subject: [PATCH] add code for inheritance
---
.../0_pets_wo_inheritance/main.cpp | 49 +++++++++++++++++++
.../1_pets_w_inheritance/cat.hpp | 12 +++++
.../1_pets_w_inheritance/main.cpp | 15 ++++++
.../1_pets_w_inheritance/pet.hpp | 24 +++++++++
.../1_pets_w_inheritance/pig.hpp | 13 +++++
.../2_pets_w_polymorphism/cat.hpp | 12 +++++
.../2_pets_w_polymorphism/main.cpp | 15 ++++++
.../2_pets_w_polymorphism/pet.hpp | 25 ++++++++++
.../2_pets_w_polymorphism/pig.hpp | 14 ++++++
9 files changed, 179 insertions(+)
create mode 100644 2021-oop1/vo/stream-04-vererbung/0_pets_wo_inheritance/main.cpp
create mode 100644 2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/cat.hpp
create mode 100644 2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/main.cpp
create mode 100644 2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/pet.hpp
create mode 100644 2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/pig.hpp
create mode 100644 2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/cat.hpp
create mode 100644 2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/main.cpp
create mode 100644 2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/pet.hpp
create mode 100644 2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/pig.hpp
diff --git a/2021-oop1/vo/stream-04-vererbung/0_pets_wo_inheritance/main.cpp b/2021-oop1/vo/stream-04-vererbung/0_pets_wo_inheritance/main.cpp
new file mode 100644
index 0000000..f1bb389
--- /dev/null
+++ b/2021-oop1/vo/stream-04-vererbung/0_pets_wo_inheritance/main.cpp
@@ -0,0 +1,49 @@
+#include <cstdio>
+#include <cstring>
+
+// TODO: destructor (free memory allocated on the heap (for name_))
+// TODO: copy constructor (implement deep copy)
+
+class Pig {
+ char* name_; // longer names now supported (compared to `char name_[10];`)
+ unsigned age_;
+
+ public:
+ Pig(const char* name, unsigned age)
+ : name_{ new char[strlen(name) + 1] }, age_{age}
+ {
+ strcpy(name_, name);
+ }
+ void drink() { printf("%s drinks\n", name_); }
+ void bath() { printf("Bath! :D\n"); }
+ unsigned getAge() { return age_; }
+ void setAge(unsigned age) { age_ = age; }
+};
+
+class Cat { // not a pig
+ char* name_;
+ unsigned age_;
+
+ public:
+ Cat(const char* name, unsigned age)
+ : name_{ new char[strlen(name) + 1] }, age_{age}
+ {
+ strcpy(name_, name);
+ }
+ void drink() { printf("%s drinks\n", name_); }
+ void play() { printf("Play! :D\n"); } // cats play and don't take a bath
+ unsigned getAge() { return age_; }
+ void setAge(unsigned age) { age_ = age; }
+};
+
+int main()
+{
+ Pig pig{ "Babe", 0 };
+ pig.bath();
+ pig.drink();
+ Cat cat{ "Grumpy", 7 };
+ cat.play();
+ // cat.bath(); // <-- error: no member named 'bath' in 'Cat' (Cats don't enjoy taking a bath – only pigs do)
+ cat.drink();
+ return 0;
+}
diff --git a/2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/cat.hpp b/2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/cat.hpp
new file mode 100644
index 0000000..44f5d6b
--- /dev/null
+++ b/2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/cat.hpp
@@ -0,0 +1,12 @@
+# include "pet.hpp"
+
+// TODO: add include guards (see pet.hpp for an example)
+
+class Cat : public Pet {
+ public:
+ Cat(const char* name, unsigned age)
+ : Pet{ name, age } {}
+ Cat(const Cat& other) = delete;
+ ~Cat() = default;
+ void play() { printf("%s plays!\n", name_); }
+};
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/main.cpp b/2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/main.cpp
new file mode 100644
index 0000000..d3d6801
--- /dev/null
+++ b/2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/main.cpp
@@ -0,0 +1,15 @@
+#include <cstdio>
+
+#include "pig.hpp"
+#include "cat.hpp"
+
+int main()
+{
+ Pig pig{ "Babe", 0 };
+ pig.drink();
+ pig.bath();
+ Cat cat{ "Grumpy", 0 };
+ cat.drink();
+ cat.play();
+ return 0;
+}
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/pet.hpp b/2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/pet.hpp
new file mode 100644
index 0000000..93a1191
--- /dev/null
+++ b/2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/pet.hpp
@@ -0,0 +1,24 @@
+#ifndef PET_H
+#define PET_H
+
+#include <cstring>
+#include <cstdio>
+
+class Pet {
+ unsigned age_;
+ protected:
+ char* name_;
+ public:
+ Pet(const char* name, unsigned age)
+ : age_{age}, name_{ new char[strlen(name) + 1] }
+ {
+ strcpy(name_, name);
+ }
+ Pet(const Pet& other) = delete;
+ ~Pet() { delete[] name_; }
+ unsigned getAge() { return age_; }
+ void setAge(unsigned age) { age_ = age; }
+ void drink() { printf("%s drinks\n", name_); }
+};
+
+#endif
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/pig.hpp b/2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/pig.hpp
new file mode 100644
index 0000000..aca892f
--- /dev/null
+++ b/2021-oop1/vo/stream-04-vererbung/1_pets_w_inheritance/pig.hpp
@@ -0,0 +1,13 @@
+# include "pet.hpp"
+
+// TODO: add include guards (see pet.hpp for an example)
+
+class Pig : public Pet {
+ public:
+ // using Pet::Pet; // possible instead of defining the constructor for Pig. Using this line, Pig inherits Pet's constructor.
+ Pig(const char* name, unsigned age)
+ : Pet{ name, age } {}
+ Pig(const Pig& other) = delete;
+ ~Pig() = default;
+ void bath() { printf("%s enjoys taking a bath!\n", name_); }
+};
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/cat.hpp b/2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/cat.hpp
new file mode 100644
index 0000000..39036e2
--- /dev/null
+++ b/2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/cat.hpp
@@ -0,0 +1,12 @@
+# include "pet.hpp"
+
+// TODO: add include guards (see pet.hpp for an example)
+
+class Cat : public Pet {
+ public:
+ Cat(const char* name, unsigned age)
+ : Pet{ name, age } {}
+ Cat(const Cat& other) = delete;
+ ~Cat() = default;
+ void play() { printf("%s plays!\n", name_); }
+};
diff --git a/2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/main.cpp b/2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/main.cpp
new file mode 100644
index 0000000..096b016
--- /dev/null
+++ b/2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/main.cpp
@@ -0,0 +1,15 @@
+#include <cstdio>
+
+#include "pig.hpp"
+#include "cat.hpp"
+
+int main() {
+ Pet* pets[2]{
+ new Pig{ "Babe", 0 },
+ new Cat{ "Grumpy", 7}
+ };
+ for (auto pet : pets) {
+ pet->drink();
+ }
+ return 0;
+}
diff --git a/2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/pet.hpp b/2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/pet.hpp
new file mode 100644
index 0000000..9a5c4cb
--- /dev/null
+++ b/2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/pet.hpp
@@ -0,0 +1,25 @@
+#ifndef PET_H
+#define PET_H
+
+#include <cstring>
+#include <cstdio>
+
+class Pet {
+ unsigned age_;
+ protected:
+ char* name_;
+ public:
+ Pet(const char* name, unsigned age)
+ : age_{age}, name_{ new char[strlen(name) + 1] }
+ {
+ strcpy(name_, name);
+ }
+ Pet(const Pet& other) = delete;
+ ~Pet() { delete[] name_; }
+ unsigned getAge() { return age_; }
+ void setAge(unsigned age) { age_ = age; }
+ // virtual void drink() = 0; // if we use this line instead of the next, Pet becomes an abstract class.
+ virtual void drink() { printf("%s drinks.\n", name_); }
+};
+
+#endif
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/pig.hpp b/2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/pig.hpp
new file mode 100644
index 0000000..fa67f76
--- /dev/null
+++ b/2021-oop1/vo/stream-04-vererbung/2_pets_w_polymorphism/pig.hpp
@@ -0,0 +1,14 @@
+# include "pet.hpp"
+
+// TODO: add include guards (see pet.hpp for an example)
+
+class Pig : public Pet {
+ public:
+ // using Pet::Pet; // possible instead of defining the constructor for Pig. Using this line, Pig inherits Pet's constructor.
+ Pig(const char* name, unsigned age)
+ : Pet{ name, age } {}
+ Pig(const Pig& other) = delete;
+ ~Pig() = default;
+ void bath() { printf("%s enjoys taking a bath!\n", name_); }
+ void drink() override { printf("%s drinks water.\n", name_); }
+};
--
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