diff --git a/alloc/stack.cpp b/alloc/stack.cpp
index fa74737e..b33a6d2d 100644
--- a/alloc/stack.cpp
+++ b/alloc/stack.cpp
@@ -99,3 +99,27 @@ stack::reset (void)
 {
     m_cursor = m_begin;
 }
+
+
+///////////////////////////////////////////////////////////////////////////////
+size_t
+stack::capacity (void) const
+{
+    return m_end - m_begin;
+}
+
+
+//-----------------------------------------------------------------------------
+size_t
+stack::size (void) const
+{
+    return m_cursor - m_begin;
+}
+
+
+//-----------------------------------------------------------------------------
+size_t
+stack::remain (void) const
+{
+    return capacity () - size ();
+}
diff --git a/alloc/stack.hpp b/alloc/stack.hpp
index f0d78a0f..055a6bec 100644
--- a/alloc/stack.hpp
+++ b/alloc/stack.hpp
@@ -39,6 +39,10 @@ namespace util { namespace alloc {
 
         void reset (void);
 
+        size_t capacity (void) const;
+        size_t size     (void) const;
+        size_t remain   (void) const;
+
     private:
         char *m_begin, *m_end, *m_cursor;
     };