Struct ManualReply 

pub struct ManualReply<T: ?Sized>(/* private fields */);

Helper for replying or rejecting calls marked with manual_reply = true.

This struct mirrors the now-deprecated ManualReply<T> type from the IC Rust CDK. It uses PhantomData<T> internally to preserve the correct return type in the generated Candid interface, but never actually serializes anything because you send the reply or reject manually.

When to use

• Your method is annotated with #[update(..., manual_reply = true)] or #[query(..., manual_reply = true)].
• You want to send the reply or reject explicitly, rather than having the CDK serialize and return your function’s result automatically.
• You still want the generated .did file to correctly show the return type.

Example

#[update(manual_reply = true)]
fn my_method() -> ManualReply<()> {
    if something_went_wrong() {
        return ManualReply::reject("bad input");
    }
    ManualReply::one(())
}

Implementations

impl<T: ?Sized> ManualReply<T>

pub fn one<U>(value: U) -> Self

where U: CandidType,

Sends a reply containing the given value as a single Candid return.

Example

ManualReply::one(42u64); // replies with 42

pub fn reject(message: impl AsRef<str>) -> Self

Rejects the call with the given message (user-level reject).

Example

ManualReply::reject("Not allowed");

Trait Implementations

impl<T> CandidType for ManualReply<T>

where T: CandidType + ?Sized,

fn _ty() -> Type

fn idl_serialize<S>(&self, _: S) -> Result<(), S::Error>

where S: Serializer,

fn ty() -> Type

fn id() -> TypeId

impl<T: Clone + ?Sized> Clone for ManualReply<T>

fn clone(&self) -> ManualReply<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug + ?Sized> Debug for ManualReply<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T: Default + ?Sized> Default for ManualReply<T>

fn default() -> ManualReply<T>

Returns the “default value” for a type.

impl<T: Copy + ?Sized> Copy for ManualReply<T>