Merge pull request #30 from servo/malloc_size_of

Implement MallocSizeOf for smallbitvec

Author: mbrubeck

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "smallbitvec"
-version = "2.5.3"
+version = "2.5.4"
 authors = ["Matt Brubeck <mbrubeck@limpet.net>"]
 license = "MIT OR Apache-2.0"
 description = "A bit vector optimized for size and inline storage"
@@ -12,6 +12,9 @@ readme = "README.md"
 edition = "2021"
 rust-version = "1.56"
 
+[dependencies]
+malloc_size_of = { version = "0.1", default-features = false, optional = true }
+
 [dev-dependencies]
 rand = { version = "0.8.5", features = ["small_rng"] }
 bit-vec = "0.6.3"

Cargo.toml

@@ -865,6 +865,17 @@ impl Index<usize> for SmallBitVec {
     }
 }
 
+#[cfg(feature = "malloc_size_of")]
+impl malloc_size_of::MallocSizeOf for SmallBitVec {
+    fn size_of(&self, ops: &mut malloc_size_of::MallocSizeOfOps) -> usize {
+        if let Some(ptr) = self.heap_ptr() {
+            unsafe { ops.malloc_size_of(ptr) }
+        } else {
+            0
+        }
+    }
+}
+
 impl hash::Hash for SmallBitVec {
     #[inline]
     fn hash<H: hash::Hasher>(&self, state: &mut H) {