X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=compiler%2Fcompiler.h;h=e1afcb424b8efa06380311cd1e865df3fb6f0d64;hp=0a0213b60fca5204cb9d0294ffb01139baa23083;hb=ff8039b745d59ede0ce9245ed24da14ecf2d3f38;hpb=225ba9e3433cf27d8ff7b213d9f78b7ef2776c70

diff --git a/compiler/compiler.h b/compiler/compiler.h
index 0a0213b6..e1afcb42 100644
--- a/compiler/compiler.h
+++ b/compiler/compiler.h
@@ -22,4 +22,15 @@
 
 #define fio_unlikely(x)	__builtin_expect(!!(x), 0)
 
+/*
+ * Check at compile time that something is of a particular type.
+ * Always evaluates to 1 so you may use it easily in comparisons.
+ */
+#define typecheck(type,x) \
+({	type __dummy; \
+	typeof(x) __dummy2; \
+	(void)(&__dummy == &__dummy2); \
+	1; \
+})
+
 #endif