Trait Contract 

pub unsafe trait Contract: IoType {
    type Slot: IoType;
    type Tmp: IoType;

    const MAIN_CONTRACT_METADATA: &[u8];

    // Required method
    fn code() -> impl Deref<Target = VariableBytes<MAX_CODE_SIZE>>;
}

A trait that indicates the struct is a contact.

Do not implement this trait explicitly! Implementation is automatically generated by the macro which generates contract implementation. This trait is required, but not sufficient for proper contract implementation, use #[contract] attribute macro instead.

Safety

The native executor relies on implementations instead of checking them:

• Self::MAIN_CONTRACT_METADATA must describe this contract
• each entry of Self::NATIVE_EXECUTOR_METHODS must contain the fingerprint and metadata of a method of this contract, and an FFI function that accepts arguments of that exact method and handles them the way the FFI functions generated by #[contract] do

Required Associated Constants

const MAIN_CONTRACT_METADATA: &[u8]

Main contract metadata, see ContractMetadataKind for encoding details.

More metadata can be contributed by trait implementations.

Required Associated Types

type Slot: IoType

Slot type used by this contract

type Tmp: IoType

Tmp type used by this contract

Required Methods

fn code() -> impl Deref<Target = VariableBytes<MAX_CODE_SIZE>>

Something that can be used as “code” in native execution environment and primarily used for testing.

This is NOT the code compiled for guest architecture!

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors