deque: check HAVE_STATEMENT_EXPR, tweaks from feedback

[ccan] / ccan / deque / deque.h

diff --git a/ccan/deque/deque.h b/ccan/deque/deque.h
index 1e5b4e8eb1167f4f9aedd1acfdc558ea2217dbdf..ffd6c2a5ced59273cce4d5cdd974a4c0298dc9e2 100644 (file)
--- a/ccan/deque/deque.h
+++ b/ccan/deque/deque.h
@@ -1,7 +1,13 @@
-#ifndef _DEQUE_H
-#define _DEQUE_H
-
+/* Licensed under Apache License v2.0 - see LICENSE file for details */
+#ifndef CCAN_DEQUE_H
+#define CCAN_DEQUE_H
+#include "config.h"
+#if !HAVE_STATEMENT_EXPR
+#error "This code needs compiler support for statement expressions. Try using gcc or clang."
+#endif

 #include <assert.h>
 #include <assert.h>

+#include <stdlib.h>
+#include <string.h>

 
 /**
  * struct deq - deque metadata
 
 /**
  * struct deq - deque metadata


@@ -87,7 +93,7 @@ int deq_resize_(struct deq *q, unsigned n);
  *     //later
  *     deq_free(z);
  *
  *     //later
  *     deq_free(z);
  *

- * Returns: pointer on success, NULL on error
+ * Returns: 0 on success, -1 on error

  */
 #define deq_new(w, min, shrink) ({                     \
        w = malloc(sizeof(*w));                         \
  */
 #define deq_new(w, min, shrink) ({                     \
        w = malloc(sizeof(*w));                         \