make the implicit conversion explicit

Signed-off-by: Kristof Szabados <Kristof.Szabados@ericsson.com>

compiler2/map.hh

@@ -81,7 +81,7 @@ private:
 
 public:
 
-  static const size_t max_map_length = -1;
+  static const size_t max_map_length = (size_t) -1;
 
   /** Creates an empty map. */
   map() : num_m(0), max_m(0), last_searched_key(0), m_ptr(NULL) { }

compiler2/vector.hh

@@ -67,7 +67,7 @@ private:
 
 public:
 
-  static const size_t max_vector_length = -1;
+  static const size_t max_vector_length = (size_t) -1;
 
   /** Creates an empty vector. */
   vector() : num_e(0), e_ptr(NULL) { }