boxed_type.rs

// Boxed type guide

// Define the boxed type
#[derive(glib::Boxed, Clone, Default)]
#[boxed_type(name = "FloatVec")]
pub struct FloatVec(Vec<f32>);

impl FloatVec {
    pub fn get(&self) -> Vec<f32> {
        self.0.clone()
    }

    pub fn set(&self, value: Vec<f32>) {
        self.0 = value;
    }
}

// Then in your object add:
#[property(get, set)]
myfloatvec: RefCell<FloatVec>,