pool: use size_t for allocated sizes

pool.hpp

@@ -22,6 +22,8 @@
 
 #include "nocopy.hpp"
 
+#include <cstdlib>
+
 namespace util {
     template <typename T>
     class pool : public nocopy {
@@ -33,18 +35,25 @@ namespace util {
 
             node   *m_head;
             node   *m_next;
-            unsigned int  m_capacity;
+            size_t  m_capacity;
 
         public:
             pool (unsigned int _capacity);
             ~pool ();
 
-            unsigned int capacity (void) const;
-
+            // Data management
             template <typename ...Args>
             T*   acquire (Args&... args);
 
             void release (T *data);
+
+            size_t capacity (void) const;
+
+            // Indexing
+            size_t index (const T*) const;
+
+            T& operator[] (size_t idx);
+            const T& operator[] (size_t idx) const;
     };
 }
 

pool.ipp

@@ -55,7 +55,7 @@ namespace util {
 
 
     template <typename T>
-    unsigned int
+    size_t
     pool<T>::capacity (void) const
         { return m_capacity; }