DynamicBufferIterator: add and use in Selections

DynamicBufferIterator are a new type of BufferIterators that
automatically update themselves when their buffer is modified.

Selections now uses this type of iterators instead of plain ones

1 files changed, 5 insertions, 0 deletions

diff --git a/src/buffer_iterator.inl.h b/src/buffer_iterator.inl.h
index db59a8b4..feae368d 100644
--- a/src/buffer_iterator.inl.h
+++ b/src/buffer_iterator.inl.h
@@ -18,6 +18,11 @@ inline const Buffer& BufferIterator::buffer() const
     return *m_buffer;
 }
 
+inline bool BufferIterator::is_valid() const
+{
+    return m_buffer;
+}
+
 inline BufferIterator& BufferIterator::operator=(const BufferIterator& iterator)
 {
     m_buffer = iterator.m_buffer;