Instantiating QObjects directly in Rust

Your QObject types will most likely be instantiated via QML, but it is possible to create them in Rust via a template. By adding

#[namespace = "rust::cxxqtlib1"]
unsafe extern "C++" {
    include!("cxx-qt-lib/common.h");

    #[cxx_name = "make_unique"]
    #[doc(hidden)]
    fn myobject_make_unique() -> UniquePtr<MyObject>;
}

You can directly create an instance of your object wrapped in a UniquePtr within Rust, should you wish. The included header file contains some wrapper templates for constructing unique_ptr<T>, shared_ptr<T> and *T. By exposing this to the bridge with the correct namespace, constructing these structs is possible in Rust. These helper methods live in cxx-qt-lib, and thus need to be included, and this is also why the namespace is necessary. These are helper functions defined by CXX-Qt, and are Not the same as std::make_unique, etc...

Passing Parameters

You can also supply the constructor with parameters via these helper methods, but you should ensure that any constructors with different arguments have different names in Rust, via renaming.

#[namespace = "rust::cxxqtlib1"]
unsafe extern "C++" {
    include!("cxx-qt-lib/common.h");

    #[rust_name = "new_my_object_with_parent"]
    fn make_unique(parent: *mut QObject) -> UniquePtr<MyObject>;
    
    // Overloading without the parent parameter
    #[rust_name = "new_my_object"]
    fn make_unique() -> UniquePtr<MyObject>;
}

Possible Methods