From 287bb1ca31776f447b980bb7a13c97e6fadc12cc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sosth=C3=A8ne=20Gu=C3=A9don?= <sosthene@nitrokey.com>
Date: Thu, 20 Jun 2024 09:50:08 +0200
Subject: [PATCH] Remove default fature requirement and add an heapless-0.8
 feature

---
 Cargo.toml | 3 ++-
 src/lib.rs | 7 ++++---
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 3ffc6f8..e4e517d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,4 +19,5 @@ serde = { version = "1.0", default-features = false }
 serde_test = "1.0.176"
 
 [features]
-default = []
+# From/Into implementation to `heapless::Vec<u8, N>`
+"heapless-0.8" = []
diff --git a/src/lib.rs b/src/lib.rs
index c796d71..30201c9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,9 +5,6 @@
 #![cfg_attr(not(test), no_std)]
 #![allow(clippy::result_unit_err)]
 
-#[cfg(not(feature = "default"))]
-compile_error!("default features are required so that functionality can be put behind a feature flag in the future");
-
 use core::{
     cmp::Ordering,
     fmt::{self, Debug},
@@ -32,12 +29,14 @@ pub type Bytes16 = Bytes<16>;
 pub type Bytes32 = Bytes<32>;
 pub type Bytes64 = Bytes<64>;
 
+#[cfg(feature = "heapless-0.8")]
 impl<const N: usize, const M: usize> From<Vec<u8, M>> for Bytes<N> {
     fn from(vec: Vec<u8, M>) -> Self {
         Bytes { bytes: vec }.increase_capacity()
     }
 }
 
+#[cfg(feature = "heapless-0.8")]
 impl<const N: usize, const M: usize> From<Bytes<M>> for Vec<u8, N> {
     fn from(value: Bytes<M>) -> Self {
         value.increase_capacity().bytes
@@ -600,7 +599,9 @@ mod tests {
     fn from() {
         let _: Bytes<10> = [0; 10].into();
         let _: Bytes<10> = (&[0; 8]).into();
+        #[cfg(feature = "heapless-0.8")]
         let _: Bytes<10> = Vec::<u8, 10>::new().into();
+        #[cfg(feature = "heapless-0.8")]
         let _: Bytes<10> = Vec::<u8, 9>::new().into();
     }
 }