Project: Building a Modular Plugin System with Templates, CRTP & Concepts — Phase 3 Capstone

Plugin System Architecture

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Plugin versioning: Add minimum_host_version to PluginInfo and reject plugins requiring a newer API than the host provides
Dependency injection: Add register_service<T>(std::shared_ptr<T>) to the registry and allow plugins to declare dependencies via requires<T>()
Priority ordering: Add an int priority() to the plugin interface and sort the execution order automatically
Config file: Parse a plugins.toml file to determine which plugins to load and what config to pass initialize()

Phase 3 Concept	Used In Plugin System
Abstract interfaces (Module 11)	`IPlugin` pure virtual contract
CRTP static polymorphism (Module 11)	`PluginBase<Derived>` zero-overhead helpers
`unique_ptr` ownership (Module 6)	Registry owns plugins via `unique_ptr<T>`
`std::move` semantics (Module 3)	Plugin transferred into registry on registration
Templates + `PluginRegistry<T>` (Module 13)	Generic registry works for any IPlugin subtype
Concepts (Module 19)	`ValidPlugin` constrains registration
`std::ranges::find_if` (Module 15)	Finding plugins by name
Variadic compile-time checks	`static_assert` on plugin names

Proceed to Phase 4: Multithreading & Atomics →

Part of the C++ Mastery Course — 30 modules from modern C++ basics to expert systems engineering.