Project design

Design the skeleton of the expert final mini app.

Project: Expert final

In this 5-lesson expert final project we combine every expert topic inside one Engine class. Each lesson adds a piece: first a compile-time factorial via template metaprogramming, then a parallel sum with std::thread and std::atomic, then a volatile memory-mapped I/O simulation, and finally a C-compatible interface with extern "C".

Each lesson's starting code contains the previous lesson's solution. The project grows step by step and ends with a working mini application. The output grows by one line per lesson.

Engine class skeleton

First we define an empty Engine class. We put a static const int Version = 1; constant inside; this carries the project version at compile time. In later lessons we will add new methods on top of this skeleton.

Example: class Engine { public: static const int Version = 1; };. In main we write std::cout << "Ready"; to confirm the skeleton runs. The output is a single line: Ready. Each later lesson adds a new line.

Exercise Define the Engine class skeleton

Define an Engine class. Under public: add static const int Version = 1;. In main write std::cout << "Ready";.

Show example solution

#include <iostream>

class Engine {
public:
    static const int Version = 1;
};

int main() {
    std::cout << "Ready";
    return 0;
}

Test yourself

Why use a single Engine class in this project?
```
class Engine { public: static const int Version = 1; };
```
- To zero out memory usage
- To speed up the compiler
- To gather multiple topics under one roof
- To change the operating system
Show answer

To gather multiple topics under one roof — One class holds template, parallel work, register access and the C interface together.

Complete the class name

class ____ { public: static const int Version = 1; };

Show answer

class Engine { public: static const int Version = 1; };

Match each piece to its role

class Engine

Class skeleton
static const int Version

Compile-time constant
std::cout

Writing output
"Ready"

First output

Next lesson: Metaprogramming

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