Add containers module with initial implementation and integrate into CMake build system.

cpp/.idea/.name

@@ -1 +1 @@
-pointer
+containers

cpp/.idea/misc.xml

@@ -3,7 +3,7 @@
   <component name="CMakePythonSetting">
     <option name="pythonIntegrationState" value="YES" />
   </component>
-  <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$/classes">
+  <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$/containers">
     <contentRoot DIR="$PROJECT_DIR$" />
   </component>
 </project>

cpp/CMakeLists.txt

@@ -4,3 +4,4 @@ project(cpp)
 add_subdirectory(intro)
 add_subdirectory(pointer)
 add_subdirectory(classes)
+add_subdirectory(containers)

cpp/classes/CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 4.1)
-project(pointer)
+project(classes)
 
 set(CMAKE_CXX_STANDARD 20)
 
-add_executable(pointer main.cpp ClassA.cpp)
+add_executable(classes main.cpp ClassA.cpp)

cpp/classes/ClassA.cpp

@@ -2,6 +2,36 @@
 
 #include <iostream>
 
+ClassA::ClassA() : IComparable(), _number(0), _pDecimal(new float(0.0f)) {
+    std::cout << "ClassA()" << std::endl;
+
+    // _pDecimal = new float(0.0f);
+}
+
+ClassA::ClassA(const ClassA &other) :
+    IComparable(),
+    _number(other._number),
+    _pDecimal(new float(*other._pDecimal)) {
+
+    std::cout << "ClassA(const ClassA &other)" << std::endl;
+
+    // // for presentation only
+    // // shallow copy
+    // _number = other._number;
+    // *_pDecimal = *other._pDecimal;
+    //
+    // // deep copy
+    // _number = other._number;
+    // _pDecimal = new float(*other._pDecimal);
+}
+
+ClassA::~ClassA() {
+    std::cout << "~ClassA()" << std::endl;
+
+    delete _pDecimal;
+    _pDecimal = nullptr;
+}
+
 void ClassA::Print() {
     std::cout << "ClassA" << std::endl;
 }

cpp/classes/ClassA.h

@@ -8,16 +8,23 @@ class ClassA : public IComparable {
 
 public:
     // public
+    ClassA(); // default constructor
+    ClassA(const ClassA& other); // copy constructor
+    ~ClassA() override; // destructor
+
     void Print();
     int CompareTo(IComparable* other) override;
 
+    const float& GetDecimal() const { return *_pDecimal; }
+    void SetDecimal(float decimal) { *_pDecimal = decimal; }
+
 protected:
     // protected
 
 private:
     // private
     int _number = 0;
+    float* _pDecimal = nullptr;
 };
 
-
 #endif //POINTER_CLASSA_H

cpp/classes/IComparable.h

@@ -1,8 +1,13 @@
 #ifndef POINTER_ICOMPARABLE_H
 #define POINTER_ICOMPARABLE_H
+#include <iostream>
 
 class IComparable {
 public:
+    // only for presentation purposes
+    IComparable() { std::cout << "IComparable()" << std::endl; }
+    virtual ~IComparable() { std::cout << "~IComparable()" << std::endl; }
+
     virtual int CompareTo(IComparable* other) = 0;
 };
 

cpp/classes/main.cpp

@@ -1,4 +1,5 @@
 #include "ClassA.h"
+#include <list>
 
 int main() {
     ClassA a{};
@@ -20,5 +21,24 @@ int main() {
     delete pComparable;
     pComparable = nullptr;
 
+    // copy object
+    ClassA a2 = a;
+
+    std::list<ClassA> list;
+    std::list<ClassA>::iterator it;
+
+    for (it = list.begin(); it != list.end(); ++it) {
+       it->Print();
+    }
+
+    std::list<IComparable*> list2;
+    std::list<IComparable*>::iterator it2;
+
+    for (it2 = list2.begin(); it2 != list2.end(); ++it2) {
+        (*it2)->CompareTo(&a);
+    }
+
+    IComparable* pComparables[10];
+
     return 0;
 }

cpp/containers/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 4.1)
+project(containers)
+
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_FLAGS -pedantic-errors)
+
+add_executable(containers main.cpp
+        functions.cpp)

cpp/containers/functions.cpp

@@ -0,0 +1,14 @@
+#include <iostream>
+
+void printArrayAtPosition(int *array, int index) {
+    if (array == nullptr) {
+        return;
+    }
+    if (index < 0) {
+        return;
+    }
+
+    std::cout << "size of array: " << sizeof(array) << std::endl;
+    std::cout << array[index] << std::endl;
+}
+

cpp/containers/functions.h

@@ -0,0 +1,10 @@
+//
+// Created by David Hackbarth on 20.02.26.
+//
+
+#ifndef CONTAINERS_FUNCTIONS_H
+#define CONTAINERS_FUNCTIONS_H
+
+void printArrayAtPosition(int* array, int index);
+
+#endif //CONTAINERS_FUNCTIONS_H

cpp/containers/main.cpp

@@ -0,0 +1,65 @@
+#include <iostream>
+#include <vector>
+#include <list>
+
+#include "functions.h"
+
+typedef std::list<float> FloatList;
+typedef FloatList::iterator FloatListIterator;
+
+int main() {
+    // C array
+    int numbers[5] = {1, 2, 3, 4, 5}; // stack array
+    const int count = 10;
+    // count *= 2;
+    int numbers2[count];
+    numbers2[0] = 10;
+
+    int* numbers3 = new int[count]; // heap array
+    delete[] numbers3;
+    numbers3 = nullptr;
+
+    // numbers[10] = 100;
+
+    std::cout << "size of numbers: " << sizeof(numbers) << std::endl;
+
+    printArrayAtPosition(numbers, 19);
+
+    // vector
+    std::vector<int> v;
+    v.push_back(10);
+    v.push_back(20);
+    v.push_back(30);
+    v.pop_back();
+    v[1] = 100;
+
+    std::cout << "v: " << v.size() << "/" << v.capacity() << std::endl;
+
+    v.push_back(40);
+
+    std::cout << "v: " << v.size() << "/" << v.capacity() << std::endl;
+
+    v.push_back(50);
+
+    std::cout << "v: " << v.size() << "/" << v.capacity() << std::endl;
+
+    v.push_back(60);
+
+    std::cout << "v: " << v.size() << "/" << v.capacity() << std::endl;
+
+    v.reserve(100);
+
+    std::cout << "v: " << v.size() << "/" << v.capacity() << std::endl;
+
+    printArrayAtPosition(v.data(), 1);
+
+    // list
+    std::list<int> l;
+    std::list<int>::iterator it;
+
+    for (it = l.begin(); it != l.end(); ++it) {
+        std::cout << *it << std::endl;
+    }
+
+    return 0;
+}