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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
use url::Url;
// Custom Handle type which trivially wraps an i64.
pub struct Handle(pub i64);
// We must implement the UniffiCustomTypeConverter trait for each custom type on the scaffolding side
impl UniffiCustomTypeConverter for Handle {
// The `Builtin` type will be used to marshall values across the FFI
type Builtin = i64;
// Convert Builtin to our custom type
fn into_custom(val: Self::Builtin) -> uniffi::Result<Self> {
// Convert our custom type to Builtin
fn from_custom(obj: Self) -> Self::Builtin {
// Use `url::Url` as a custom type, with `String` as the Builtin
impl UniffiCustomTypeConverter for Url {
type Builtin = String;
fn into_custom(val: Self::Builtin) -> uniffi::Result<Self> {
fn from_custom(obj: Self) -> Self::Builtin {
// And a little struct and function that ties them together.
pub struct CustomTypesDemo {
url: Url,
handle: Handle,
pub fn get_custom_types_demo(v: Option<CustomTypesDemo>) -> CustomTypesDemo {
v.unwrap_or_else(|| CustomTypesDemo {
url: Url::parse("").unwrap(),
handle: Handle(123),
include!(concat!(env!("OUT_DIR"), "/"));