1 files changed, 18 insertions, 3 deletions
diff --git a/klm/util/sized_iterator.hh b/klm/util/sized_iterator.hh
index cf998953..dce8f229 100644
--- a/klm/util/sized_iterator.hh
+++ b/klm/util/sized_iterator.hh
@@ -36,6 +36,11 @@ class SizedInnerIterator {
     void *Data() { return ptr_; }
     std::size_t EntrySize() const { return size_; }
 
+    friend inline void swap(SizedInnerIterator &first, SizedInnerIterator &second) {
+      std::swap(first.ptr_, second.ptr_);
+      std::swap(first.size_, second.size_);
+    }
+
   private:
     uint8_t *ptr_;
     std::size_t size_;
@@ -64,9 +69,19 @@ class SizedProxy {
     const void *Data() const { return inner_.Data(); }
     void *Data() { return inner_.Data(); }
 
+  /**
+     // TODO: this (deep) swap was recently added. why? if any std heap sort etc
+     // algs are using swap, that's going to be worse performance than using
+     // =. i'm not sure why we *want* a deep swap. if C++11 compilers are
+     // choosing between move constructor and swap, then we'd better implement a
+     // (deep) move constructor. it may also be that this is moot since i made
+     // ProxyIterator a reference and added a shallow ProxyIterator swap? (I
+     // need Ken or someone competent to judge whether that's correct also. -
+     // let me know at graehl@gmail.com
+  */
     friend void swap(SizedProxy &first, SizedProxy &second) {
       std::swap_ranges(
-          static_cast<char*>(first.inner_.Data()), 
+          static_cast<char*>(first.inner_.Data()),
           static_cast<char*>(first.inner_.Data()) + first.inner_.EntrySize(),
           static_cast<char*>(second.inner_.Data()));
     }
@@ -87,7 +102,7 @@ typedef ProxyIterator<SizedProxy> SizedIterator;
 
 inline SizedIterator SizedIt(void *ptr, std::size_t size) { return SizedIterator(SizedProxy(ptr, size)); }
 
-// Useful wrapper for a comparison function i.e. sort.  
+// Useful wrapper for a comparison function i.e. sort.
 template <class Delegate, class Proxy = SizedProxy> class SizedCompare : public std::binary_function<const Proxy &, const Proxy &, bool> {
   public:
     explicit SizedCompare(const Delegate &delegate = Delegate()) : delegate_(delegate) {}
@@ -106,7 +121,7 @@ template <class Delegate, class Proxy = SizedProxy> class SizedCompare : public
     }
 
     const Delegate &GetDelegate() const { return delegate_; }
-    
+
   private:
     const Delegate delegate_;
 };