Trait HostCustomConstructor

Source

pub trait HostCustomConstructor:
    CustomConstructor
    + Send
    + Sync
    + 'static {
    type Custom: HostType;
    type Fields: HostTypeSequence;
}

Expand description

A constructor proven to occur in the declared schema for Custom.

This trait is sealed. Constructors must be selected with HostCustomConstructorAt, so safe user code cannot fabricate a runtime constructor index.

use geam_core::{
    HostCustomConstructor, HostCustomConstructorListEnd, HostCustomSchema, HostCustomType,
    HostTypeListEnd,
};

struct Schema;

impl HostCustomSchema for Schema {
    const PACKAGE: &'static str = "application";
    const MODULE: &'static str = "main";
    const NAME: &'static str = "Thing";
    const PARAMETER_COUNT: usize = 0;

    type Constructors = HostCustomConstructorListEnd;
}

type Thing = HostCustomType<Schema>;
struct Fabricated;

impl HostCustomConstructor for Fabricated {
    type Custom = Thing;
    type Fields = HostTypeListEnd;
}