Function write_vec_dynamic

rust/fory-core/src/serializer/codec.rs:1989–2061

(value: &Vec<T>, context: &mut WriteContext)

}

fn write_vec_dynamic<T, C>(value: &Vec<T>, context: &mut WriteContext) -> Result<(), Error>
where
    T: 'static,
    C: Codec<T>,
{
    let mut has_null = false;
    let mut is_same_type = true;
    let mut first_type_id: Option<std::any::TypeId> = None;
    for item in value {
        if C::is_none(item) {
            has_null = true;
        } else if C::is_polymorphic() && is_same_type {
            let concrete_id = C::concrete_type_id(item);
            if let Some(first_id) = first_type_id {
                if first_id != concrete_id {
                    is_same_type = false;
                }
            } else {
                first_type_id = Some(concrete_id);
            }
        }
    }
    if C::is_polymorphic() && is_same_type && first_type_id.is_none() {
        is_same_type = false;
    }
    let mut header = 0u8;
    if has_null {
        header |= HAS_NULL;
    }
    if !need_to_write_type_for_field(C::static_type_id()) {
        header |= DECL_ELEMENT_TYPE;
    }
    if is_same_type {
        header |= IS_SAME_TYPE;
    }
    if C::is_shared_ref() {
        header |= TRACKING_REF;
    }
    context.writer.write_u8(header);
    if is_same_type && (header & DECL_ELEMENT_TYPE) == 0 {
        if C::is_polymorphic() {
            let type_id = first_type_id.ok_or_else(|| {
                Error::type_error(
                    "Unable to determine concrete type for polymorphic collection elements",
                )
            })?;
            context.write_any_type_info(C::static_type_id() as u32, type_id)?;
        } else {
            C::write_type_info(context)?;
        }
    }
    let elem_ref_mode = if C::is_shared_ref() {
        RefMode::Tracking
    } else if has_null {
        RefMode::NullOnly
    } else {
        RefMode::None
    };