From 0bf2d8be87d407b5eb7159e12bc997ed4b266012 Mon Sep 17 00:00:00 2001
From: Alexander Steinmaurer <a@steinmaurer.cc>
Date: Thu, 29 Apr 2021 16:02:24 +0200
Subject: [PATCH] Examples 7th Lecture
---
2021-oop1/vo/stream-07/01-unique-ptr-1.cpp | 25 ++++++++++++
2021-oop1/vo/stream-07/02-unique-ptr-2.cpp | 24 ++++++++++++
2021-oop1/vo/stream-07/03-unique-ptr-3.cpp | 23 +++++++++++
2021-oop1/vo/stream-07/04-access-members.cpp | 38 +++++++++++++++++++
2021-oop1/vo/stream-07/05-shared-ptr-1.cpp | 36 ++++++++++++++++++
2021-oop1/vo/stream-07/05-shared-ptr-2.cpp | 37 ++++++++++++++++++
.../vo/stream-07/06-circular-dependency.cpp | 26 +++++++++++++
.../vo/stream-07/07-dangling-pointer.cpp | 29 ++++++++++++++
2021-oop1/vo/stream-07/08-weak-ptr-1.cpp | 22 +++++++++++
2021-oop1/vo/stream-07/09-weak-ptr-2.cpp | 38 +++++++++++++++++++
2021-oop1/vo/stream-07/10-weak-ptr-3.cpp | 38 +++++++++++++++++++
2021-oop1/vo/stream-07/11-circular-solved.cpp | 27 +++++++++++++
2021-oop1/vo/stream-07/12-exceptions-1.cpp | 25 ++++++++++++
2021-oop1/vo/stream-07/13-exceptions-2.cpp | 14 +++++++
2021-oop1/vo/stream-07/14-exceptions-3.cpp | 14 +++++++
2021-oop1/vo/stream-07/15-exceptions-4.cpp | 22 +++++++++++
16 files changed, 438 insertions(+)
create mode 100644 2021-oop1/vo/stream-07/01-unique-ptr-1.cpp
create mode 100644 2021-oop1/vo/stream-07/02-unique-ptr-2.cpp
create mode 100644 2021-oop1/vo/stream-07/03-unique-ptr-3.cpp
create mode 100644 2021-oop1/vo/stream-07/04-access-members.cpp
create mode 100644 2021-oop1/vo/stream-07/05-shared-ptr-1.cpp
create mode 100644 2021-oop1/vo/stream-07/05-shared-ptr-2.cpp
create mode 100644 2021-oop1/vo/stream-07/06-circular-dependency.cpp
create mode 100644 2021-oop1/vo/stream-07/07-dangling-pointer.cpp
create mode 100644 2021-oop1/vo/stream-07/08-weak-ptr-1.cpp
create mode 100644 2021-oop1/vo/stream-07/09-weak-ptr-2.cpp
create mode 100644 2021-oop1/vo/stream-07/10-weak-ptr-3.cpp
create mode 100644 2021-oop1/vo/stream-07/11-circular-solved.cpp
create mode 100644 2021-oop1/vo/stream-07/12-exceptions-1.cpp
create mode 100644 2021-oop1/vo/stream-07/13-exceptions-2.cpp
create mode 100644 2021-oop1/vo/stream-07/14-exceptions-3.cpp
create mode 100644 2021-oop1/vo/stream-07/15-exceptions-4.cpp
diff --git a/2021-oop1/vo/stream-07/01-unique-ptr-1.cpp b/2021-oop1/vo/stream-07/01-unique-ptr-1.cpp
new file mode 100644
index 0000000..192fd28
--- /dev/null
+++ b/2021-oop1/vo/stream-07/01-unique-ptr-1.cpp
@@ -0,0 +1,25 @@
+#include <iostream>
+#include <string>
+#include <memory>
+
+struct SuperHero {
+ public:
+ SuperHero(std::string name) : name_(name)
+ {
+ std::cout << name_ << " wurde erzeugt" << std::endl;
+ };
+
+ ~SuperHero()
+ {
+ std::cout << name_ << " wurde zerstört" << std::endl;
+ };
+
+ private:
+ std::string name_;
+};
+
+int main()
+{
+ std::unique_ptr<SuperHero> s1(new SuperHero("Batman"));
+ return 0;
+}
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/02-unique-ptr-2.cpp b/2021-oop1/vo/stream-07/02-unique-ptr-2.cpp
new file mode 100644
index 0000000..8d2936a
--- /dev/null
+++ b/2021-oop1/vo/stream-07/02-unique-ptr-2.cpp
@@ -0,0 +1,24 @@
+#include <iostream>
+#include <string>
+#include <memory>
+
+struct SuperHero {
+ std::string name_;
+ SuperHero(std::string name) : name_(name)
+ {
+ std::cout << name_ << " wurde erzeugt" << std::endl;
+ };
+
+ ~SuperHero()
+ {
+ std::cout << name_ << " wurde zerstört" << std::endl;
+ };
+};
+
+int main()
+{
+ {
+ std::unique_ptr<SuperHero> s1(new SuperHero("Batman"));
+ } //Scope von s1 endet => s1 wird zerstört.
+ return 0;
+}
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/03-unique-ptr-3.cpp b/2021-oop1/vo/stream-07/03-unique-ptr-3.cpp
new file mode 100644
index 0000000..3b28f7f
--- /dev/null
+++ b/2021-oop1/vo/stream-07/03-unique-ptr-3.cpp
@@ -0,0 +1,23 @@
+#include <iostream>
+#include <string>
+#include <memory>
+
+struct SuperHero {
+ std::string name_;
+ SuperHero(std::string name) : name_(name)
+ {
+ std::cout << name_ << " wurde erzeugt" << std::endl;
+ };
+
+ ~SuperHero()
+ {
+ std::cout << name_ << " wurde zerstört" << std::endl;
+ };
+};
+
+int main()
+{
+ auto joker1 = std::make_shared<SuperHero>("Joker");
+ std::weak_ptr<SuperHero> joker2(joker1);
+ std::cout << joker1.use_count() << std::endl;
+}
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/04-access-members.cpp b/2021-oop1/vo/stream-07/04-access-members.cpp
new file mode 100644
index 0000000..d9c2a44
--- /dev/null
+++ b/2021-oop1/vo/stream-07/04-access-members.cpp
@@ -0,0 +1,38 @@
+#include <iostream>
+#include <string>
+#include <memory>
+
+struct SuperHero {
+ public:
+ SuperHero(std::string name, std::string phrase) : name_(name),
+ phrase_(phrase)
+ {
+ std::cout << name_ << " wurde erzeugt" << std::endl;
+ };
+
+ ~SuperHero()
+ {
+ std::cout << name_ << " wurde zerstört" << std::endl;
+ };
+
+ void SayPhrase()
+ {
+ std::cout << phrase_ << std::endl;
+ };
+
+ private:
+ std::string phrase_;
+ std::string name_;
+};
+
+int main()
+{
+ std::unique_ptr<SuperHero> s1(new SuperHero("Batman", "I am Batman!"));
+ std::unique_ptr<SuperHero> s2 = std::make_unique<SuperHero>("Iron Man",
+ "I love you 3000!");
+
+ s1->SayPhrase(); //I am Batman!
+ s2->SayPhrase(); //I love you 3000!
+
+ return 0;
+}
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/05-shared-ptr-1.cpp b/2021-oop1/vo/stream-07/05-shared-ptr-1.cpp
new file mode 100644
index 0000000..45a8ce6
--- /dev/null
+++ b/2021-oop1/vo/stream-07/05-shared-ptr-1.cpp
@@ -0,0 +1,36 @@
+#include <iostream>
+#include <string>
+#include <memory>
+
+struct SuperHero {
+ public:
+ SuperHero(std::string name) : name_(name)
+ {
+ std::cout << name_ << " wurde erzeugt" << std::endl;
+ };
+
+ ~SuperHero()
+ {
+ std::cout << name_ << " wurde zerstört" << std::endl;
+ };
+
+ void SayPhrase()
+ {
+ std::cout << phrase_ << std::endl;
+ };
+
+ private:
+ std::string phrase_;
+ std::string name_;
+};
+
+int main()
+{
+ std::shared_ptr<SuperHero> s1(new SuperHero("Batman")); //one pointer to object
+ std::shared_ptr<SuperHero> s2(s1); //two pointers to object
+ std::shared_ptr<SuperHero> s3 = s2; //three pointers to object
+
+ std::cout << s1.use_count() << std::endl; //3
+
+ return 0;
+}
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/05-shared-ptr-2.cpp b/2021-oop1/vo/stream-07/05-shared-ptr-2.cpp
new file mode 100644
index 0000000..26b95de
--- /dev/null
+++ b/2021-oop1/vo/stream-07/05-shared-ptr-2.cpp
@@ -0,0 +1,37 @@
+#include <iostream>
+#include <string>
+#include <memory>
+
+struct SuperHero {
+ public:
+ SuperHero(std::string name) : name_(name)
+ {
+ std::cout << name_ << " wurde erzeugt" << std::endl;
+ };
+
+ ~SuperHero()
+ {
+ std::cout << name_ << " wurde zerstört" << std::endl;
+ };
+
+ void SayPhrase()
+ {
+ std::cout << phrase_ << std::endl;
+ };
+
+ private:
+ std::string phrase_;
+ std::string name_;
+};
+
+int main()
+{
+ std::shared_ptr<SuperHero> s1 = std::make_shared<SuperHero>("Batman");
+ {
+ std::shared_ptr<SuperHero> s2(s1);
+ std::cout << s1.use_count() << std::endl; //2
+ }
+ std::cout << s1.use_count() << std::endl; //1
+
+ return 0;
+}
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/06-circular-dependency.cpp b/2021-oop1/vo/stream-07/06-circular-dependency.cpp
new file mode 100644
index 0000000..c5be5c4
--- /dev/null
+++ b/2021-oop1/vo/stream-07/06-circular-dependency.cpp
@@ -0,0 +1,26 @@
+#include <iostream>
+#include <string>
+#include <memory>
+
+struct SuperHero {
+ public:
+ SuperHero(std::string name) : name_(name) { };
+ ~SuperHero() { };
+ std::shared_ptr<SuperHero> enemie_;
+
+ private:
+ std::string name_;
+};
+
+int main()
+{
+ std::shared_ptr<SuperHero> s1(new SuperHero("Batman"));
+ std::shared_ptr<SuperHero> s2 = std::make_shared<SuperHero>("Two-Face");
+
+ s1->enemie_ = s2;
+ s2->enemie_ = s1;
+
+ return 0;
+}
+
+// Check for valgrind :)
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/07-dangling-pointer.cpp b/2021-oop1/vo/stream-07/07-dangling-pointer.cpp
new file mode 100644
index 0000000..58dc9f5
--- /dev/null
+++ b/2021-oop1/vo/stream-07/07-dangling-pointer.cpp
@@ -0,0 +1,29 @@
+#include <iostream>
+#include <string>
+#include <memory>
+
+struct SuperHero {
+ public:
+ SuperHero(std::string name) : name_(name) { };
+ ~SuperHero() { };
+ std::string GetName() const
+ {
+ return name_;
+ }
+
+ private:
+ std::string name_;
+};
+
+int main()
+{
+ auto joker1 = std::make_shared<SuperHero>("Joker");
+ std::shared_ptr<SuperHero> joker2(joker1);
+
+ joker1 = nullptr;
+
+ std::cout << joker1->GetName() << std::endl; //Segmentation Fault
+ return 0;
+
+ return 0;
+}
diff --git a/2021-oop1/vo/stream-07/08-weak-ptr-1.cpp b/2021-oop1/vo/stream-07/08-weak-ptr-1.cpp
new file mode 100644
index 0000000..8977c47
--- /dev/null
+++ b/2021-oop1/vo/stream-07/08-weak-ptr-1.cpp
@@ -0,0 +1,22 @@
+#include <iostream>
+#include <string>
+#include <memory>
+
+struct SuperHero {
+ std::string name_;
+ SuperHero(std::string name) : name_(name)
+ {
+ std::cout << name_ << " wurde erzeugt" << std::endl;
+ };
+
+ ~SuperHero()
+ {
+ std::cout << name_ << " wurde zerstört" << std::endl;
+ };
+};
+
+int main()
+{
+ std::unique_ptr<SuperHero> s1 = std::make_unique<SuperHero>("Batman");
+ return 0;
+}
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/09-weak-ptr-2.cpp b/2021-oop1/vo/stream-07/09-weak-ptr-2.cpp
new file mode 100644
index 0000000..7bad666
--- /dev/null
+++ b/2021-oop1/vo/stream-07/09-weak-ptr-2.cpp
@@ -0,0 +1,38 @@
+#include <iostream>
+#include <string>
+#include <memory>
+
+struct SuperHero {
+ std::string name_;
+ SuperHero(std::string name) : name_(name)
+ {
+ std::cout << name_ << " wurde erzeugt" << std::endl;
+ };
+
+ ~SuperHero()
+ {
+ std::cout << name_ << " wurde zerstört" << std::endl;
+ };
+
+ std::string GetName() const
+ {
+ return name_;
+ }
+
+};
+
+int main()
+{
+ auto hero = std::make_shared<SuperHero>("Aquaman");
+ std::weak_ptr<SuperHero> w_hero(hero);
+
+ auto new_hero = w_hero.lock(); //Umwandlung in std::shared_ptr
+
+ new_hero = nullptr;
+ hero = nullptr;
+ if(w_hero.expired())
+ {
+ std::cout << "Kein Aquaman mehr :-(";
+ }
+ return 0;
+}
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/10-weak-ptr-3.cpp b/2021-oop1/vo/stream-07/10-weak-ptr-3.cpp
new file mode 100644
index 0000000..a052e7d
--- /dev/null
+++ b/2021-oop1/vo/stream-07/10-weak-ptr-3.cpp
@@ -0,0 +1,38 @@
+#include <iostream>
+#include <string>
+#include <memory>
+
+struct SuperHero {
+ std::string name_;
+ SuperHero(std::string name) : name_(name)
+ {
+ std::cout << name_ << " wurde erzeugt" << std::endl;
+ };
+
+ ~SuperHero()
+ {
+ std::cout << name_ << " wurde zerstört" << std::endl;
+ };
+
+ std::string GetName() const
+ {
+ return name_;
+ }
+
+};
+
+int main()
+{
+ auto hero = std::make_shared<SuperHero>("Aquaman");
+ std::weak_ptr<SuperHero> w_hero(hero);
+ //std::cout << w_hero->GetName(); --> Zugriff nicht möglich!
+
+ std::cout << w_hero.use_count() << std::endl; //1
+
+ auto new_hero = w_hero.lock(); //Umwandlung in std::shared_ptr
+ std::cout << new_hero->GetName();
+
+ std::cout << w_hero.use_count() << std::endl; //2
+
+ return 0;
+}
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/11-circular-solved.cpp b/2021-oop1/vo/stream-07/11-circular-solved.cpp
new file mode 100644
index 0000000..9c501d7
--- /dev/null
+++ b/2021-oop1/vo/stream-07/11-circular-solved.cpp
@@ -0,0 +1,27 @@
+#include <iostream>
+#include <string>
+#include <memory>
+
+struct SuperHero {
+ public:
+ SuperHero(std::string name) : name_(name) { };
+ ~SuperHero() { };
+ std::weak_ptr<SuperHero> enemie_;
+
+ private:
+ std::string name_;
+};
+
+
+int main()
+{
+ std::shared_ptr<SuperHero> s1(new SuperHero("Batman"));
+ std::shared_ptr<SuperHero> s2 = std::make_shared<SuperHero>("Two-Face");
+
+ s1->enemie_ = s2;
+ s2->enemie_ = s1;
+
+ return 0;
+}
+
+//Check with Valgrind :)
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/12-exceptions-1.cpp b/2021-oop1/vo/stream-07/12-exceptions-1.cpp
new file mode 100644
index 0000000..781ff32
--- /dev/null
+++ b/2021-oop1/vo/stream-07/12-exceptions-1.cpp
@@ -0,0 +1,25 @@
+#include <iostream>
+
+double division(int var1, int var2)
+{
+ if (var2 == 0) {
+ throw "Division by Zero.";
+ }
+ return (var1 / var2);
+}
+
+int main()
+{
+ int a = 30;
+ int b = 0;
+ double d = 0;
+
+ try {
+ d = division(a, b);
+ std::cout << d << std::endl;
+ }
+ catch (const char* error) {
+ std::cout << error << std::endl;
+ }
+ return 0;
+}
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/13-exceptions-2.cpp b/2021-oop1/vo/stream-07/13-exceptions-2.cpp
new file mode 100644
index 0000000..e4822f3
--- /dev/null
+++ b/2021-oop1/vo/stream-07/13-exceptions-2.cpp
@@ -0,0 +1,14 @@
+#include <iostream>
+#include <exception>
+
+int main()
+{
+ try {
+ int* myarray = new int[1000000000000];
+ } catch (std::bad_alloc &ex) {
+ std::cout << "Wozu brauchst du so viel Speicher?! " << ex.what() << std::endl;
+ }
+ catch (std::exception &ex) {
+ std::cout << ex.what() << std::endl;
+ }
+}
diff --git a/2021-oop1/vo/stream-07/14-exceptions-3.cpp b/2021-oop1/vo/stream-07/14-exceptions-3.cpp
new file mode 100644
index 0000000..ceb0382
--- /dev/null
+++ b/2021-oop1/vo/stream-07/14-exceptions-3.cpp
@@ -0,0 +1,14 @@
+#include <iostream>
+#include <exception>
+
+int main()
+{
+ try {
+ std::vector<int> rules = {34, 35};
+ rules.at(2);
+ } catch(std::out_of_range &ex){
+ std::cout << "out_of_range " << ex.what() << std::endl;
+ } catch (std::exception &ex) {
+ std::cout << "exception " << ex.what() << std::endl;
+ }
+}
\ No newline at end of file
diff --git a/2021-oop1/vo/stream-07/15-exceptions-4.cpp b/2021-oop1/vo/stream-07/15-exceptions-4.cpp
new file mode 100644
index 0000000..03fe779
--- /dev/null
+++ b/2021-oop1/vo/stream-07/15-exceptions-4.cpp
@@ -0,0 +1,22 @@
+#include <iostream>
+#include <exception>
+
+class MyException : public std::exception
+{
+ public:
+ const char* what () const throw ()
+ {
+ return "Ich schmeiße mit Exceptions um mich!";
+ }
+};
+
+int main()
+{
+ try {
+ throw MyException();
+ } catch (MyException& e) {
+ std::cout << e.what() << std::endl;
+ } catch (std::exception& e) {
+ std::cout << e.what();
+ }
+}
\ No newline at end of file
--
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