C++ examples

README.md

@@ -10,16 +10,50 @@ It contains C++ examples for all classic GoF design patterns. Each pattern inclu
 
 ## Requirements
 
-TODO
-
+The examples were written as cross platform console application using c++11. It means that you should be able to compile and execute those examples with any recent compiler.
+
+we recommend working with Visual Studio Code because it is a lightweight and cross-platform tool .It is a very complete IDE and is available for free (https://code.visualstudio.com/). You may need to install c++ extension and the compiler you prefer (The extension is still in preview and its focus is code editing, navigation, and debugging support for C and C++). For more information on how to use VSCode with c++ refer to: https://code.visualstudio.com/docs/languages/cpp .
+
+For code execution in VSCode you will need to set up your task first. An example using g++ :  
+
+```sh
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "type": "shell",
+            "command": "g++ -g -std=c++11 Conceptual/main.cc -o main",
+            "group":{
+                "kind": "build",
+                "isDefault": true    
+            },
+            "problemMatcher":"$gcc"
+        }
+    ]
+}
+```
+Then you just need to start the executable.In case you have some doubts here you have an useful [tutorial] using vscode.   
 
 ## Contributor's Guide
 
-TODO
+I appreciate any help, whether it's a simple fix of a typo or a whole new example. Just make a fork, make your change and submit a pull request.
+
+Here's a style guide which might help you to keep your changes consistent with the rest of the project's code:
+
+1. All code should match the [Google style guide].
+2. Aim to put all code within one .cc file. Yes, I realize that it's not how it supposed to be done in production. However, it helps people to understand examples better, since all code fits into one screen.
+3. The comments doesn't follow the style guide for compatibility reasons withe other language examples. 
+
 
 
 ## License
 
 This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
 
 <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-nd/4.0/80x15.png" /></a>
+
+
+
+[Google style guide]: <https://google.github.io/styleguide/cppguide.html#C++_Version>
+[tutorial]: <https://www.youtube.com/watch?v=-erXR6k9TeE>

src/AbstractFactory/Conceptual/Output.txt

@@ -0,0 +1,8 @@
+
+Client: Testing client code with the first factory type:
+The result of the product B1.
+The result of the B1 collaborating with the (The result of the product A1.)
+
+Client: Testing the same client code with the second factory type:
+The result of the product B2.
+The result of the B2 collaborating with the (The result of the product A2.)

src/AbstractFactory/Conceptual/main.cc

@@ -0,0 +1,247 @@
+#include <iostream>
+#include <string>
+
+/**
+ * EN: Abstract Factory Design Pattern
+ *
+ * Intent: Lets you produce families of related objects without specifying their
+ * concrete classes.
+ *
+ * RU: Паттерн Абстрактная Фабрика
+ *
+ * Назначение: Предоставляет интерфейс для создания семейств связанных или
+ * зависимых объектов без привязки к их конкретным классам.
+ */
+/**
+ * EN: The Abstract Factory interface declares a set of methods that return
+ * different abstract products. These products are called a family and are
+ * related by a high-level theme or concept. Products of one family are usually
+ * able to collaborate among themselves. A family of products may have several
+ * variants, but the products of one variant are incompatible with products of
+ * another.
+ *
+ * RU: Интерфейс Абстрактной Фабрики объявляет набор методов, которые возвращают
+ * различные абстрактные продукты. Эти продукты называются семейством и связаны
+ * темой или концепцией высокого уровня. Продукты одного семейства обычно могут
+ * взаимодействовать между собой. Семейство продуктов может иметь несколько
+ * вариаций, но продукты одной вариации несовместимы с продуктами другой.
+ */
+
+class AbstractProductA;
+class AbstractProductB;
+
+class AbstractFactory
+{
+public:
+    virtual AbstractProductA* CreateProductA() const = 0;
+    virtual AbstractProductB* CreateProductB() const = 0;
+};
+
+/**
+ * EN: Each distinct product of a product family should have a base interface.
+ * All variants of the product must implement this interface.
+ *
+ * RU: Каждый отдельный продукт семейства продуктов должен иметь базовый
+ * интерфейс. Все вариации продукта должны реализовывать этот интерфейс.
+ */
+
+class AbstractProductA
+{
+    /**
+ * EN: Define virtual destructor in case you need it.
+ *
+ * RU: 
+ */
+public:
+    virtual ~AbstractProductA(){};
+    virtual std::string UsefulFunctionA() const = 0;    
+};
+
+
+/**
+ * EN: Concrete Products are created by corresponding Concrete Factories.
+ *
+ * RU: Конкретные продукты создаются соответствующими Конкретными Фабриками.
+ */
+
+class ConcreteProductA1 : public AbstractProductA
+{
+public:
+    std::string UsefulFunctionA() const override
+    {
+        return "The result of the product A1.";
+    }
+};
+
+class ConcreteProductA2 : public AbstractProductA
+{
+    std::string UsefulFunctionA() const override
+    {
+        return "The result of the product A2.";
+    }
+};
+
+/**
+ * EN: Here's the the base interface of another product. All products can
+ * interact with each other, but proper interaction is possible only between
+ * products of the same concrete variant.
+ *
+ * RU: Базовый интерфейс другого продукта. Все продукты могут взаимодействовать
+ * друг с другом, но правильное взаимодействие возможно только между продуктами
+ * одной и той же конкретной вариации.
+ */
+
+class AbstractProductB
+{
+    /**
+     * EN: Product B is able to do its own thing...
+     *
+     * RU: Продукт B способен работать самостоятельно...
+     */
+public:
+    virtual ~AbstractProductB(){};
+
+    virtual std::string UsefulFunctionB() const = 0;
+    /**
+     * EN: ...but it also can collaborate with the ProductA.
+     *
+     * The Abstract Factory makes sure that all products it creates are of the
+     * same variant and thus, compatible.
+     *
+     * RU: ...а также взаимодействовать с Продуктами Б той же вариации.
+     *
+     * Абстрактная Фабрика гарантирует, что все продукты, которые она создает,
+     * имеют одинаковую вариацию и, следовательно, совместимы.
+     */
+    virtual std::string AnotherUsefulFunctionB(const AbstractProductA& collaborator) const = 0;
+};
+
+/**
+ * EN: Concrete Products are created by corresponding Concrete Factories.
+ *
+ * RU: Конкретные Продукты создаются соответствующими Конкретными Фабриками.
+ */
+
+class ConcreteProductB1: public AbstractProductB{
+    public:
+
+    std::string UsefulFunctionB() const override{
+        return "The result of the product B1.";
+    }
+    /**
+     * EN: The variant, Product B1, is only able to work correctly with the
+     * variant, Product A1. Nevertheless, it accepts any instance of
+     * AbstractProductA as an argument.
+     *
+     * RU: Продукт B1 может корректно работать только с Продуктом A1. Тем не
+     * менее, он принимает любой экземпляр Абстрактного Продукта А в качестве
+     * аргумента.
+     */
+    std::string AnotherUsefulFunctionB(const AbstractProductA& collaborator) const override{
+        const std::string result= collaborator.UsefulFunctionA();
+        return "The result of the B1 collaborating with ( "+ result+" )";
+    }
+};
+
+class ConcreteProductB2: public AbstractProductB{
+    public:
+    std::string UsefulFunctionB() const override{
+        return "The result of the product B2.";
+    }
+
+    /**
+     * EN: The variant, Product B2, is only able to work correctly with the
+     * variant, Product A2. Nevertheless, it accepts any instance of
+     * AbstractProductA as an argument.
+     *
+     * RU: Продукт B2 может корректно работать только с Продуктом A2. Тем не
+     * менее, он принимает любой экземпляр Абстрактного Продукта А в качестве
+     * аргумента.
+     */
+    std::string AnotherUsefulFunctionB(const AbstractProductA& collaborator) const override{
+        const std::string result= collaborator.UsefulFunctionA();
+        return "The result of the B2 collaborating with ( "+ result+" )";
+    }
+};
+
+
+
+/**
+ * EN: Concrete Factories produce a family of products that belong to a single
+ * variant. The factory guarantees that resulting products are compatible. Note
+ * that signatures of the Concrete Factory's methods return an abstract product,
+ * while inside the method a concrete product is instantiated.
+ *
+ * RU: Конкретная Фабрика производит семейство продуктов одной вариации. Фабрика
+ * гарантирует совместимость полученных продуктов. Обратите внимание, что
+ * сигнатуры методов Конкретной Фабрики возвращают абстрактный продукт, в то
+ * время как внутри метода создается экземпляр конкретного продукта.
+ */
+
+class ConcreteFactory1 : public AbstractFactory
+{
+public:
+    AbstractProductA* CreateProductA() const override
+    {
+        return new ConcreteProductA1();
+    }
+
+    AbstractProductB* CreateProductB() const override
+    {
+        return new ConcreteProductB1();
+    }
+};
+/**
+ * EN: Each Concrete Factory has a corresponding product variant.
+ *
+ * RU: Каждая Конкретная Фабрика имеет соответствующую вариацию продукта.
+ */
+
+class ConcreteFactory2 : public AbstractFactory
+{
+public:
+    AbstractProductA* CreateProductA() const override
+    {
+        return new ConcreteProductA2();
+    }
+
+    AbstractProductB* CreateProductB() const override
+    {
+        return new ConcreteProductB2();
+    }
+};
+
+
+
+
+/**
+ * EN: The client code works with factories and products only through abstract
+ * types: AbstractFactory and AbstractProduct. This lets you pass any factory or
+ * product subclass to the client code without breaking it.
+ *
+ * RU: Клиентский код работает с фабриками и продуктами только через абстрактные
+ * типы: Абстрактная Фабрика и Абстрактный Продукт. Это позволяет передавать
+ * любой подкласс фабрики или продукта клиентскому коду, не нарушая его.
+ */
+
+void ClientCode(const AbstractFactory& factory){
+    const AbstractProductA* product_a =factory.CreateProductA();
+    const AbstractProductB* product_b =factory.CreateProductB();
+    std::cout << product_b->UsefulFunctionB() << "\n";
+    std::cout << product_b->AnotherUsefulFunctionB(*product_a) << "\n";
+    delete product_a;
+    delete product_b;
+}
+
+int main(){
+    std::cout << "Client: Testing client code with the first factory type:\n";
+    ConcreteFactory1* f1= new ConcreteFactory1();
+    ClientCode(*f1);
+    delete f1;
+    std::cout << std::endl;
+    std::cout << "Client: Testing the same client code with the second factory type:\n";
+    ConcreteFactory2* f2= new ConcreteFactory2();
+    ClientCode(*f2);
+    delete f2;
+    return 0;
+}

src/Adapter/Conceptual/MultipleInheritance/Output.txt

@@ -0,0 +1,10 @@
+Client: I can work just fine with the Target objects:
+Target: The default target's behavior.
+
+Client: The Adaptee class has a weird interface. See, I don't understand it:
+Adaptee: .eetpadA eht fo roivaheb laicepS
+
+Client: But I can work with it via the Adapter:
+Adapter: (TRANSLATED) Special behavior of the Adaptee.
+
+