cppmagic: New module

[ccan] / ccan / cppmagic / cppmagic.h

diff --git a/ccan/cppmagic/cppmagic.h b/ccan/cppmagic/cppmagic.h
new file mode 100644 (file)
index 0000000..f29e0ec
--- /dev/null
+++ b/ccan/cppmagic/cppmagic.h
@@ -0,0 +1,42 @@
+/* MIT (BSD) license - see LICENSE file for details */
+#ifndef CCAN_CPPMAGIC_H
+#define CCAN_CPPMAGIC_H
+
+/**
+ * CPPMAGIC_NOTHING - expands to nothing
+ */
+#define CPPMAGIC_NOTHING()
+
+/**
+ * CPPMAGIC_STRINGIFY - convert arguments to a string literal
+ */
+#define _CPPMAGIC_STRINGIFY(...)       #__VA_ARGS__
+#define CPPMAGIC_STRINGIFY(...)                _CPPMAGIC_STRINGIFY(__VA_ARGS__)
+
+/**
+ * CPPMAGIC_GLUE2 - glue arguments together
+ *
+ * CPPMAGIC_GLUE2(@a_, @b_)
+ *     expands to the expansion of @a_ followed immediately
+ *     (combining tokens) by the expansion of @b_
+ */
+#define _CPPMAGIC_GLUE2(a_, b_)                a_##b_
+#define CPPMAGIC_GLUE2(a_, b_)         _CPPMAGIC_GLUE2(a_, b_)
+
+/**
+ * CPPMAGIC_1ST - return 1st argument
+ *
+ * CPPMAGIC_1ST(@a_, ...)
+ *     expands to the expansion of @a_
+ */
+#define CPPMAGIC_1ST(a_, ...)          a_
+
+/**
+ * CPPMAGIC_2ND - return 2nd argument
+ *
+ * CPPMAGIC_2ST(@a_, @b_, ...)
+ *     expands to the expansion of @b_
+ */
+#define CPPMAGIC_2ND(a_, b_, ...)      b_
+
+#endif /* CCAN_CPPMAGIC_H */