From c789200f5be50079b46482cf24c346bef94ddeb0 Mon Sep 17 00:00:00 2001
From: Yuichi Nishiwaki <yuichi.nishiwaki@gmail.com>
Date: Sat, 1 Feb 2014 15:40:43 +0900
Subject: [PATCH] add gensym macro

---
 include/picrin.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/picrin.h b/include/picrin.h
index dbe58f12..1cd42654 100644
--- a/include/picrin.h
+++ b/include/picrin.h
@@ -42,6 +42,14 @@ extern "C" {
 #define FALLTHROUGH ((void)0)
 #define UNUSED(v) ((void)(v))
 
+#define GENSYM2__(x,y) x##y
+#define GENSYM1__(x,y) GENSYM2__(x,y)
+#if defined(__COUNTER__)
+# define GENSYM(x) GENSYM1__(x,__COUNTER__)
+#else
+# define GENSYM(x) GENSYM1__(x,__LINE__)
+#endif
+
 #include "config.h"
 #include "picrin/value.h"