From 91b49a7786482e1bb7ffa3c7e8afe688e8f94afd Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Tue, 23 Jul 2024 06:57:14 +0000
Subject: [PATCH] add basic exchange util

Signed-off-by: Jason Volk <jason@zemos.net>
---
 src/core/utils/mod.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/core/utils/mod.rs b/src/core/utils/mod.rs
index bbd52829..d7b6a72a 100644
--- a/src/core/utils/mod.rs
+++ b/src/core/utils/mod.rs
@@ -26,8 +26,16 @@ pub use string::{str_from_bytes, string_from_bytes};
 pub use sys::available_parallelism;
 pub use time::now_millis as millis_since_unix_epoch;
 
+#[inline]
 pub fn clamp<T: Ord>(val: T, min: T, max: T) -> T { cmp::min(cmp::max(val, min), max) }
 
+#[inline]
+pub fn exchange<T: Clone>(state: &mut T, source: T) -> T {
+	let ret = state.clone();
+	*state = source;
+	ret
+}
+
 #[must_use]
 pub fn generate_keypair() -> Vec<u8> {
 	let mut value = rand::string(8).as_bytes().to_vec();