Make bitmap methods const if not modifying the bitmap

luna/include/luna/Bitmap.h

@@ -11,25 +11,25 @@ class Bitmap
     void* move(void* new_location, usize new_location_size_in_bytes);
 
     void set(usize index, bool value);
-    bool get(usize index);
+    bool get(usize index) const;
 
     // size() returns size in bits! If you want the size in bytes, call size_in_bytes().
-    usize size()
+    usize size() const
     {
         return m_size_in_bytes * 8;
     }
 
-    usize size_in_bytes()
+    usize size_in_bytes() const
     {
         return m_size_in_bytes;
     }
 
-    void* location()
+    void* location() const
     {
         return (void*)m_location;
     }
 
-    bool initialized()
+    bool initialized() const
     {
         return m_location;
     }

luna/src/Bitmap.cpp

@@ -42,7 +42,7 @@ void Bitmap::set(usize index, bool value)
     if (value) { m_location[byte_index] |= bit_mask; }
 }
 
-bool Bitmap::get(usize index)
+bool Bitmap::get(usize index) const
 {
     expect(initialized(), "Bitmap was never initialized");
     expect(index < size(), "Bitmap access out of range");