From cfa7b3d0a1900b725e5489dfec2c39abb8569c29 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Wed, 28 Nov 2018 14:10:04 +0900
Subject: [PATCH] hash-funcs: introduce macro to create typesafe hash_ops

(cherry picked from commit d1005d1c0050d3dc3a24c054bac4c4916073cbba)

Resolves: #2037807
---
 src/basic/hash-funcs.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/basic/hash-funcs.h b/src/basic/hash-funcs.h
index 5e5989f021..2ff687e5f9 100644
--- a/src/basic/hash-funcs.h
+++ b/src/basic/hash-funcs.h
@@ -13,6 +13,20 @@ struct hash_ops {
         compare_func_t compare;
 };
 
+#define _DEFINE_HASH_OPS(uq, name, type, hash_func, compare_func, scope) \
+        _unused_ static void (* UNIQ_T(static_hash_wrapper, uq))(const type *, struct siphash *) = hash_func; \
+        _unused_ static int (* UNIQ_T(static_compare_wrapper, uq))(const type *, const type *) = compare_func; \
+        scope const struct hash_ops name = {                            \
+                .hash = (hash_func_t) hash_func,                        \
+                .compare = (compare_func_t) compare_func,               \
+        }
+
+#define DEFINE_HASH_OPS(name, type, hash_func, compare_func)            \
+        _DEFINE_HASH_OPS(UNIQ, name, type, hash_func, compare_func,)
+
+#define DEFINE_PRIVATE_HASH_OPS(name, type, hash_func, compare_func)    \
+        _DEFINE_HASH_OPS(UNIQ, name, type, hash_func, compare_func, static)
+
 void string_hash_func(const void *p, struct siphash *state);
 int string_compare_func(const void *a, const void *b) _pure_;
 extern const struct hash_ops string_hash_ops;