What is CL++?

CL++ is a programming language. You write C++-inspired source; the clpp compiler emits Luau for Roblox. Code samples on this site use the language id clpp — not cpp.

It is not a full C++ compiler and not a Roblox SDK. Cluaupp owns engine headers, Rojo, and project init. This site teaches the language: syntax, types, OOP, and every construct the compiler understands.

What you will be able to do

By the end of this course you will:

1. Install clpp and the editor pack.
2. Write .clh / .clp / .clpp files and know which Roblox instance they become.
3. Use . for the default, : for types and safe calls, :: for static/manual Connect, ~> for Janitor.
4. Build services with struct, guard, match, observable, and signal.
5. Drive UI with Fusion and Vide in CL++.
6. Read the language reference the same way you would read cplusplus.com/reference — every utility has syntax, parameters, emit, and an example.

A tiny program

#include <clpp/roblox.clh>

void init() {
    Players players = GetService<Players>();
    post("online: " .: players.GetPlayers());
}

void init() is the script entry point. There is no int main(). post is print. GetService<Players>() is game:GetService("Players").

Course map

Part	You learn
Start here	Install, hello world, mental model, style
The language	Types, operators, functions, OOP, Roblox
Modern syntax	Signals, guard, match, async, attributes
UI & advanced	Fusion, Vide, advanced types, production patterns
Reference	Language reference (every utility), cheat sheet, unsupported list
Specification	Compiler pipeline, EBNF, type table, emit

Next: Install the compiler.