rust-cpp-callback-event.rs

use cpp::cpp;
use cpp::cpp_class;

cpp!{{
    #include <iostream>
    class Test {
    public:
       void fireEvent() {
            std::cout << "fireEvent called" << std::endl;
            onEvent(100, 200);
       }
    protected:
       virtual void onEvent(int, int) {
            std::cout << "onEvent called" << std::endl;
       }
    };
}}

cpp!{{
    class TestImpl : public Test {
    protected:
       virtual void onEvent(int a, int b) override {
            rust!(My_Rust_MethodImpl [this : TestImpl as "TestImpl*", a : u32 as "int", b : u32 as "int"] {
                this.on_event(a, b);
            });
       }
    };
}}

cpp_class!(pub unsafe struct TestImpl as "TestImpl");
impl TestImpl {
    fn new() -> Self {
        unsafe { cpp!([] -> TestImpl as "TestImpl" { return TestImpl(); }) }
    }

    fn run(&self) {
        unsafe {
            cpp!([self as "TestImpl*"] {
                self->fireEvent();
            })
        }
    }

    fn on_event(&self, a: u32, b: u32) {
        println!("event - {} {}", a, b)
    }
}


fn main() {
    let t = TestImpl::new();
    t.run();
}