Add methods _front & _last for arrays.

m-array.h

@@ -545,6 +545,22 @@
     return M_CONST_CAST(type, &v->ptr[i]);                              \
   }                                                                     \
                                                                         \
+  static inline const type *                                            \
+  M_C(name, _front)(const array_t v)                                    \
+  {                                                                     \
+    ARRAYI_CONTRACT(v);                                                 \
+    assert (v->size > 0);                                               \
+    return M_C(name, _cget)(v, 0);                                      \
+  }                                                                     \
+                                                                        \
+  static inline const type *                                            \
+  M_C(name, _last)(const array_t v)                                     \
+  {                                                                     \
+    ARRAYI_CONTRACT(v);                                                 \
+    assert (v->size > 0);                                               \
+    return M_C(name, _cget)(v, v->size-1);                              \
+  }                                                                     \
+                                                                        \
   static inline void                                                    \
   M_C(name, _it)(array_it_t it, const array_t v)			\
   {                                                                     \