Add _erase for array

m-array.h

@@ -468,6 +468,15 @@
     memmove(&v->ptr[i], &v->ptr[i+1], sizeof(type)*(v->size - i) );     \
     v->size--;                                                          \
     ARRAYI_CONTRACT(v);                                                 \
+  }                                                                     \
+  									\
+  static inline bool                                                    \
+  M_C(name, _erase)(array_t a, size_t i)                                \
+  {                                                                     \
+    ARRAYI_CONTRACT(a);                                                 \
+    if (i >= a->size) return false;                                     \
+    M_C(name, _pop_at)(NULL, a, i);                                     \
+    return true;                                                        \
   }                                                                     \
                                                                         \
   M_IF_METHOD(INIT, oplist)(                                            \

tests/test-marray.c

@@ -175,6 +175,14 @@ static void test_uint(void)
   assert (x == 1478963);
   assert (s == *array_uint_back(v));
 
+  s = array_uint_size (v);
+  bool b = array_uint_erase (v, 12459);
+  assert (b == false);
+  assert (s == array_uint_size (v));
+  b = array_uint_erase (v, 0);
+  assert (b == true);
+  assert (s == array_uint_size (v)+1);
+  
   array_uint_clear(v);
   array_uint_clear(v2);
 }