feat: add serde feature

Author: BobAnkh

.gitignore

@@ -1,2 +1,3 @@
 /target
 /Cargo.lock
+.vscode

Cargo.toml

@@ -1,11 +1,11 @@
 [package]
 name = "bandwidth"
-version = "0.2.1"
+version = "0.3.0"
 edition = "2021"
 license = "Apache-2.0"
-description="A library for representing bandwidth speed in a variety of units, mimicking the `core::time::Duration` struct."
+description = "A library for representing bandwidth speed in a variety of units, mimicking the `core::time::Duration` struct."
 readme = "README.md"
-homepage ="https://github.com/stack-rs/bandwidth"
+homepage = "https://github.com/stack-rs/bandwidth"
 repository = "https://github.com/stack-rs/bandwidth"
 keywords = ["bandwidth", "data-structures", "network", "no-std", "utility"]
 documentation = "https://docs.rs/bandwidth"
@@ -15,3 +15,10 @@ categories = ["data-structures", "network-programming", "no-std"]
 
 [dependencies]
 rustversion = "1.0"
+serde = { version = "1.0.152", default-features = false, optional = true, features = [
+    "derive",
+] }
+
+[features]
+default = ["std"]
+std = ["serde?/std"]

README.md

@@ -5,7 +5,11 @@
 [![docs.rs](https://img.shields.io/badge/docs.rs-bandwidth-blue?logo=data:image/svg+xml;base64,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)](https://docs.rs/bandwidth)
 [![LICENSE Apache-2.0](https://img.shields.io/github/license/stack-rs/bandwidth?logo=Apache)](https://github.com/stack-rs/bandwidth/blob/main/LICENSE)
 
-A library for representing bandwidth speed in a variety of units, mimicking the `core::time::Duration` struct.]
+A library for representing bandwidth speed in a variety of units, mimicking the `core::time::Duration` struct.
+
+**MSRV**: 1.60
+
+This library supports `no_std` and `serde`. `std` are enabled by default.
 
 ## Usage
 

src/lib.rs

@@ -22,16 +22,18 @@
 use core::fmt::{self, Write};
 use core::iter::Sum;
 use core::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Sub, SubAssign};
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
 
 const BPS_PER_GBPS: u32 = 1_000_000_000;
 const BPS_PER_MBPS: u32 = 1_000_000;
 const BPS_PER_KBPS: u32 = 1_000;
 const MBPS_PER_GBPS: u64 = 1_000;
 const KBPS_PER_GBPS: u64 = 1_000_000;
 
-#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
 #[repr(transparent)]
-#[derive(Default)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize), serde(transparent))]
 struct BitPerSec(u32);
 
 /// A `Bandwidth` type to represent a link's bandwidth(to describe how many bits can be sent
@@ -62,6 +64,7 @@ struct BitPerSec(u32);
 /// let ten_mbps = Bandwidth::from_mbps(10);
 /// ```
 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct Bandwidth {
     gbps: u64,
     bps: BitPerSec, // Always 0 <= bps < BPS_PER_GBPS