[ADT] Make capacity_in_bytes support BitVector. NFC.

This makes it a bit easier to replace instances of vector<bool> with
BitVector.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253180 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/ADT/BitVector.h b/include/llvm/ADT/BitVector.h
index f58dd73..ad00d51 100644 (file)
--- a/include/llvm/ADT/BitVector.h
+++ b/include/llvm/ADT/BitVector.h
@@ -34,7 +34,7 @@ class BitVector {
 
   BitWord  *Bits;        // Actual bits.
   unsigned Size;         // Size of bitvector in bits.
-  unsigned Capacity;     // Size of allocated memory in BitWord.
+  unsigned Capacity;     // Number of BitWords allocated in the Bits array.
 
 public:
   typedef unsigned size_type;
@@ -566,8 +566,16 @@ private:
     if (AddBits)
       clear_unused_bits();
   }
+
+public:
+  /// Return the size (in bytes) of the bit vector.
+  size_t getMemorySize() const { return Capacity * sizeof(BitWord); }
 };
 
+static inline size_t capacity_in_bytes(const BitVector &X) {
+  return X.getMemorySize();
+}
+
 } // End llvm namespace
 
 namespace std {