X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Fcompiler%2Fcompiler.h;h=42245646c42ff772bcc6376ffc54ac79a1c1aca1;hp=fcb89c8f2a68a9aa90f5cba4746a98910c0a551d;hb=48c1824304ac2d8aeaef7b8a55c7d9edc8992f63;hpb=e764d0a27d2b6748ea7d343042ec7d6dda1f6aae

diff --git a/ccan/compiler/compiler.h b/ccan/compiler/compiler.h
index fcb89c8f..42245646 100644
--- a/ccan/compiler/compiler.h
+++ b/ccan/compiler/compiler.h
@@ -1,3 +1,4 @@
+/* CC0 (Public domain) - see LICENSE file for details */
 #ifndef CCAN_COMPILER_H
 #define CCAN_COMPILER_H
 #include "config.h"
@@ -74,6 +75,20 @@
 #else
 #define CONST_FUNCTION
 #endif
+
+#ifndef PURE_FUNCTION
+#if HAVE_ATTRIBUTE_PURE
+/**
+ * PURE_FUNCTION - a function is pure
+ *
+ * A pure function is one that has no side effects other than it's return value
+ * and uses no inputs other than it's arguments and global variables.
+ */
+#define PURE_FUNCTION __attribute__((__pure__))
+#else
+#define PURE_FUNCTION
+#endif
+#endif
 #endif
 
 #if HAVE_ATTRIBUTE_UNUSED