Trait hdk::prelude::LinkTypesHelper

pub trait LinkTypesHelper: Sized {
    type Error;

    // Required method
    fn from_type<Z, I>(
        zome_index: Z,
        link_type: I
    ) -> Result<Option<Self>, Self::Error>
       where Z: Into<ZomeIndex>,
             I: Into<LinkType>;
}

A helper trait for finding the app defined link type from a ZomeIndex and LinkType.

If the zome id is a dependency of the calling zome and the link type is out of range (greater than the number of defined link types) then a guest error is return (which will invalidate an op if used in the validation callback).

If the zome id is not a dependency of the calling zome then this will return None.

Required Associated Types

type Error

The error associated with this conversion.

Required Methods

fn from_type<Z, I>( zome_index: Z, link_type: I ) -> Result<Option<Self>, Self::Error>

where Z: Into<ZomeIndex>, I: Into<LinkType>,

Check if the ZomeIndex and LinkType matches one of the ZomeLinkTypeKey::from(Self::variant) and if it does return that type.

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl LinkTypesHelper for ()

type Error = Infallible

fn from_type<Z, I>( _zome_index: Z, _link_type: I ) -> Result<Option<()>, <() as LinkTypesHelper>::Error>

where Z: Into<ZomeIndex>, I: Into<LinkType>,

Implementors