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

Open the Astah file (model/DesignPatternExamplesInCpp.asta).
Select model elements on the model browser of Astah.
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

Open the solution file (design-pattern-examples-in-cpp.sln) in Visual Studio.
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