Merge pull request #57 from mre/serialization-support

Add support for serialization of BitVec using serde

Cargo.toml

@@ -10,12 +10,16 @@ documentation = "https://contain-rs.github.io/bit-vec/bit_vec"
 keywords = ["data-structures", "bitvec", "bitmask", "bitmap", "bit"]
 readme = "README.md"
 
+[dependencies]
+serde = { version = "1.0", features = ["derive"], optional = true}
+
 [dev-dependencies]
 rand = "0.3.15"
+serde_json = "1.0"
 
 [features]
 default = ["std"]
-
+serialize = ["serde"]
 nightly = []
 
 std = []

src/lib.rs

@@ -96,6 +96,11 @@ extern crate std;
 #[cfg(feature="std")]
 use std::vec::Vec;
 
+#[cfg(feature="serialize")]
+extern crate serde;
+#[cfg(feature="serialize")]
+use serde::{Serialize, Deserialize};
+
 #[cfg(not(feature="std"))]
 #[macro_use]
 extern crate alloc;
@@ -212,6 +217,7 @@ static FALSE: bool = false;
 /// println!("{:?}", bv);
 /// println!("total bits set to true: {}", bv.iter().filter(|x| *x).count());
 /// ```
+#[cfg_attr(feature="serialize", derive(Serialize, Deserialize))] 
 pub struct BitVec<B=u32> {
     /// Internal representation of the bit vector
     storage: Vec<B>,
@@ -2133,6 +2139,21 @@ mod tests {
         let b = BitVec::with_capacity(10);
         let _a: Iter = b.iter();
     }
+
+    #[cfg(feature="serialize")]
+    #[test]
+    fn test_serialization() {
+        let bit_vec: BitVec = BitVec::new();
+        let serialized = serde_json::to_string(&bit_vec).unwrap();
+        let unserialized: BitVec = serde_json::from_str(&serialized).unwrap();
+        assert_eq!(bit_vec, unserialized);
+
+        let bools = vec![true, false, true, true];
+        let bit_vec: BitVec = bools.iter().map(|n| *n).collect();
+        let serialized = serde_json::to_string(&bit_vec).unwrap();
+        let unserialized = serde_json::from_str(&serialized).unwrap();
+        assert_eq!(bit_vec, unserialized);
+    }
 }
 
 #[cfg(all(test, feature = "nightly"))] mod bench;