Design Pattern Examples in C++

Model and code examples of GoF Design Patterns for C++.
This project is available for the following objectives:

• To understand GoF Design Pattern examples in C++.
• To understand the mapping between UML model and C++ code.
• To try Model-Driven Development (MDD) using Astah and M PLUS plug-in.

UML model example:

C++ header file example:

// ˅

// ˄

#ifndef STRUCTURAL_PATTERNS_COMPOSITE_FILE_H_
#define STRUCTURAL_PATTERNS_COMPOSITE_FILE_H_

// ˅
#include <string>
#include "structural_patterns/composite/FileSystemElement.h"

using namespace std;

// ˄

class File : public FileSystemElement
{
	// ˅
	
	// ˄

private:

	const string name;

	const int size;

public:

	File(const string& name, const int size);

	~File();

	const string getName() const;

	const int getSize() const;

	// Print this element with the "upper_path".
	void print(const string& upper_path) const;

	// ˅
public:
	
protected:
	
private:
	File(const File&) = delete;
	File& operator=(const File&) = delete;
	File(File&&) = delete;
	File& operator=(File&&) = delete;
	
	// ˄
};

// ˅

// ˄

#endif	// STRUCTURAL_PATTERNS_COMPOSITE_FILE_H_

// ˅

// ˄

C++ source file example:

// ˅
#include <iostream>
#include "structural_patterns/composite/File.h"

using namespace std;

// ˄

File::File(const string& name, const int size)
	: name(name)
	, size(size)
	// ˅
    
	// ˄
{
	// ˅
	
	// ˄
}

File::~File()
{
	// ˅
	
	// ˄
}

const string File::getName() const
{
	// ˅
	return name;
	// ˄
}

const int File::getSize() const
{
	// ˅
	return size;
	// ˄
}

void File::print(const string& upper_path) const
{
	// ˅
	cout << upper_path << "/" << toString() << endl;
	// ˄
}

// ˅

// ˄

Installation on Windows

UML Modeling Tool

• Download the modeling tool Astah UML or Professional, and install.
• Download M PLUS plug-in ver.2.2 or higher, and add it to Astah.
  How to add plugins to Astah

Visual Studio

• Download and install Visual Studio.
  Check "Desktop development with C++" and "C++/CLI support" when installing.
  

Usage on Windows

Code Generation from UML

1. Open the Astah file (model/DesignPatternExamplesInCpp.asta).
2. Select model elements on the model browser of Astah.
3. Click the Generate Code button.
   
   The generated code has User Code Area. The User Code Area is the area enclosed by "˅" and "˄". Handwritten code written in the User Code Area remains after a re-generation. View code example.
   For detailed usage of the tools, please see Astah Manual and M PLUS plug-in Tips.

Build and Run

1. Open the solution file (design-pattern-examples-in-cpp.sln) in Visual Studio.
2. Set up a startup project, and run it.
   

References

• Gamma, E. et al. Design Patterns: Elements of Reusable Object-Oriented Software, Addison-Wesley, 1994
• Hiroshi Yuki. Learning Design Patterns in Java [In Japanese Language], Softbank publishing, 2004

Licence

This project is licensed under the Creative Commons Zero (CC0) license. The model and code are completely free to use.

Other Language Examples

C#, Crystal, Go, Java, JavaScript, Kotlin, Python, Ruby, Scala, Swift, TypeScript