libgo/runtime/go-map-len.c

   1 /* go-map-len.c -- return the length of a map.
   2
   3    Copyright 2009 The Go Authors. All rights reserved.
   4    Use of this source code is governed by a BSD-style
   5    license that can be found in the LICENSE file.  */
   6
   7 #include <stddef.h>
   8
   9 #include "runtime.h"
  10 #include "go-assert.h"
  11 #include "map.h"
  12
  13 /* Return the length of a map.  This could be done inline, of course,
  14    but I'm doing it as a function for now to make it easy to change
  15    the map structure.  */
  16
  17 intgo
  18 __go_map_len (struct __go_map *map)
  19 {
  20   if (map == NULL)
  21     return 0;
  22   __go_assert (map->__element_count
  23                == (uintptr_t) (intgo) map->__element_count);
  24   return map->__element_count;
  25 }