This is an example for an eventsystem in C++. For more information see the corresponding blog post
Create arbitrary events and share it in your code. This example is based on a bookstore which adds and removes books to the book stock and customers by calling the according OnEvent function. For illustration purpose I just printed the function calls.
// some classes in your code which handle customers and books
Stock bookStock;
Customers customers;
// some events created by clients or any interface
NewCustomerEvent newCustomer(123, "Thomas", "Munich");
customers.OnEvent(newCustomer);
DeleteCustomerEvent deleteCustomer(456);
customers.OnEvent(deleteCustomer);
BookAddedEvent addedBook(753, "A Cool Eventsystem", "Thomas", 2022);
bookStock.OnEvent(addedBook);
BookRemovedEvent removeBook(456);
bookStock.OnEvent(removeBook);Build this example with cmake and C++17
cmake -S . -B ./build
cmake --build ./build
./build/events
New customer event: NewCustomerEvent
Id: 123
Name: Thomas
Address: Munich
Customer deleted event: DeleteCustomerEvent
Id: 456
Book added event: BookAddedEvent
Id: 753
Title: A Cool Eventsystem
Author: Thomas
Published: 2022
Book removed event: BookRemovedEvent
Id: 456