Overcomplicated UniformsStorage?

[julhe]

While trying to put a UniformStorage into an enum (and failing due to UniformStorage not beeing "object safe") , I discoverd it was easier to just write my own abstraction like

#[derive(Default)]
struct UniformVec<'a, 'b>{
    pub uniforms: Vec<(&'a str, UniformValue<'b>)>
}

impl Uniforms for UniformVec<'_, '_>{
    fn visit_values<'a, F: FnMut(&str, UniformValue<'a>)> (&'a self, mut func: F) {
        for uniform in &self.uniforms{
            func(uniform.0, uniform.1);
        }
    }
}

Forgive me the maybe naive question, but why is UniformStorage implemented as a chain of FnMut instead of an simple Vec?