add postfix operator++ to BufferIterator

src/buffer.hh

@@ -59,6 +59,9 @@ public:
     BufferIterator& operator++ ();
     BufferIterator& operator-- ();
 
+    BufferIterator operator++ (int);
+    BufferIterator operator-- (int);
+
     void clamp(bool avoid_eol);
 
     bool is_begin() const;

src/buffer_iterator.inl.hh

@@ -199,6 +199,20 @@ inline BufferIterator& BufferIterator::operator--()
     return *this;
 }
 
+inline BufferIterator BufferIterator::operator++(int)
+{
+    BufferIterator save = *this;
+    ++*this;
+    return save;
+}
+
+inline BufferIterator BufferIterator::operator--(int)
+{
+    BufferIterator save = *this;
+    --*this;
+    return save;
+}
+
 inline bool BufferIterator::is_begin() const
 {
     assert(m_buffer);