Function protobuf::reflect::accessor::make_has_get_mut_clear_accessor

pub fn make_has_get_mut_clear_accessor<M, V>(
    _name: &'static str, 
    _has_value: fn'a(_: &'a M) -> bool, 
    _get_value: fn'a(_: &'a M) -> &'a V::Value, 
    _mut_value: fn'a(_: &'a M) -> &'a mut V::Value, 
    _clr_value: fn'a(_: &'a M)
) -> Box<FieldAccessor + 'static> where
    M: Message + 'static,
    V: ProtobufType + 'static,