1 files changed, 44 insertions, 3 deletions

diff --git a/src/unstable/blob.cpp b/src/unstable/blob.cpp
index e72e265..23987f3 100644
--- a/src/unstable/blob.cpp
+++ b/src/unstable/blob.cpp
@@ -499,6 +499,26 @@ Bu::Blob::iterator &Bu::Blob::iterator::operator--()
     return *this;
 }
 
+Bu::Blob::iterator &Bu::Blob::iterator::operator+=( int32_t iDelta )
+{
+    if( bForward )
+        iIndex += iDelta;
+    else
+        iIndex -= iDelta;
+
+    return *this;
+}
+
+Bu::Blob::iterator &Bu::Blob::iterator::operator-=( int32_t iDelta )
+{
+    if( bForward )
+        iIndex -= iDelta;
+    else
+        iIndex += iDelta;
+
+    return *this;
+}
+
 Bu::Blob::iterator Bu::Blob::iterator::operator+( int32_t iDelta ) const
 {
     return iterator( pBlob, iIndex + iDelta, bForward );
@@ -541,7 +561,8 @@ bool Bu::Blob::iterator::operator!=( const Bu::Blob::const_iterator &rRhs )
     return pBlob != rRhs.pBlob || iIndex != rRhs.iIndex;
 }
 
-Bu::Blob::iterator &Bu::Blob::iterator::operator=( Bu::Blob::iterator &rRhs )
+Bu::Blob::iterator &Bu::Blob::iterator::operator=(
+        const Bu::Blob::iterator &rRhs )
 {
     pBlob = rRhs.pBlob;
     iIndex = rRhs.iIndex;
@@ -651,6 +672,26 @@ Bu::Blob::const_iterator &Bu::Blob::const_iterator::operator--()
     return *this;
 }
 
+Bu::Blob::const_iterator &Bu::Blob::const_iterator::operator+=( int32_t iDelta )
+{
+    if( bForward )
+        iIndex += iDelta;
+    else
+        iIndex -= iDelta;
+
+    return *this;
+}
+
+Bu::Blob::const_iterator &Bu::Blob::const_iterator::operator-=( int32_t iDelta )
+{
+    if( bForward )
+        iIndex -= iDelta;
+    else
+        iIndex += iDelta;
+
+    return *this;
+}
+
 Bu::Blob::const_iterator Bu::Blob::const_iterator::operator+( int32_t iDelta )
     const
 {
@@ -698,7 +739,7 @@ bool Bu::Blob::const_iterator::operator!=(
 }
 
 Bu::Blob::const_iterator &Bu::Blob::const_iterator::operator=(
-        Bu::Blob::iterator &rRhs )
+        const Bu::Blob::iterator &rRhs )
 {
     pBlob = rRhs.pBlob;
     iIndex = rRhs.iIndex;
@@ -708,7 +749,7 @@ Bu::Blob::const_iterator &Bu::Blob::const_iterator::operator=(
 }
 
 Bu::Blob::const_iterator &Bu::Blob::const_iterator::operator=(
-        Bu::Blob::const_iterator &rRhs )
+        const Bu::Blob::const_iterator &rRhs )
 {
     pBlob = rRhs.pBlob;
     iIndex = rRhs.iIndex;