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-rw-r--r--src/common/common_funcs.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/common/common_funcs.h b/src/common/common_funcs.h
index c2750a63c..229eb74c9 100644
--- a/src/common/common_funcs.h
+++ b/src/common/common_funcs.h
@@ -31,6 +31,10 @@ template<> struct CompileTimeAssert<true> {};
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
+/// Textually concatenates two tokens. The double-expansion is required by the C preprocessor.
+#define CONCAT2(x, y) DO_CONCAT2(x, y)
+#define DO_CONCAT2(x, y) x ## y
+
#ifndef _MSC_VER
#include <errno.h>