Program structure

Hydrogen programs contain namespaces and types; executable statements belong inside methods. There are no top-level statements or free functions.

namespace MyApp {
    public class Program {
        public static int Main(string[] args) {
            System.Console.WriteLine("Hello, Hydrogen!");
            return 0;
        }
    }
}

Namespaces use braces. A source can also declare a class in the global namespace.

Imports

using MyLibrary;

Place imports before declarations. They let a file use simple names for types in that namespace but do not leak to other files. Use fully qualified builtin names, such as System.Console.WriteLine; this is the stable spelling recognized by the released compiler.

Entry point

The released compiler accepts static Main methods returning void or int, with either no parameters or one string[] parameter. Project source files are listed in a .hyproj manifest; namespaces do not require a directory layout.