reqsign_core/futures_util.rs
1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements. See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership. The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License. You may obtain a copy of the License at
8//
9// http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied. See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18/// BoxedFuture is the type alias of [`futures::future::BoxFuture`].
19#[cfg(not(target_arch = "wasm32"))]
20pub type BoxedFuture<'a, T> = futures::future::BoxFuture<'a, T>;
21
22/// BoxedFuture is the type alias of [`futures::future::LocalBoxFuture`].
23#[cfg(target_arch = "wasm32")]
24pub type BoxedFuture<'a, T> = futures::future::LocalBoxFuture<'a, T>;
25
26/// MaybeSend is a marker to determine whether a type is `Send` or not.
27///
28/// [`MaybeSend`] is equivalent to `Send` on non-wasm32 target.
29#[cfg(not(target_arch = "wasm32"))]
30pub trait MaybeSend: Send {}
31
32/// MaybeSend is a marker to determine whether a type is `Send` or not.
33///
34/// [`MaybeSend`] is empty on wasm32 target.
35#[cfg(target_arch = "wasm32")]
36pub trait MaybeSend {}
37
38#[cfg(not(target_arch = "wasm32"))]
39impl<T: Send> MaybeSend for T {}
40
41#[cfg(target_arch = "wasm32")]
42impl<T> MaybeSend for T {}