#define CPPMAGIC_IFELSE(cond_) \
_CPPMAGIC_IFELSE(CPPMAGIC_NONZERO(cond_))
+/**
+ * CPPMAGIC_EVAL - force multiple expansion passes
+ *
+ * Forces macros in the arguments to be expanded repeatedly (up to
+ * 1024 times) even when CPP would usually stop expanding.
+ */
+#define CPPMAGIC_EVAL1(...) __VA_ARGS__
+#define CPPMAGIC_EVAL2(...) \
+ CPPMAGIC_EVAL1(CPPMAGIC_EVAL1(__VA_ARGS__))
+#define CPPMAGIC_EVAL4(...) \
+ CPPMAGIC_EVAL2(CPPMAGIC_EVAL2(__VA_ARGS__))
+#define CPPMAGIC_EVAL8(...) \
+ CPPMAGIC_EVAL4(CPPMAGIC_EVAL4(__VA_ARGS__))
+#define CPPMAGIC_EVAL16(...) \
+ CPPMAGIC_EVAL8(CPPMAGIC_EVAL8(__VA_ARGS__))
+#define CPPMAGIC_EVAL32(...) \
+ CPPMAGIC_EVAL16(CPPMAGIC_EVAL16(__VA_ARGS__))
+#define CPPMAGIC_EVAL64(...) \
+ CPPMAGIC_EVAL32(CPPMAGIC_EVAL32(__VA_ARGS__))
+#define CPPMAGIC_EVAL128(...) \
+ CPPMAGIC_EVAL64(CPPMAGIC_EVAL64(__VA_ARGS__))
+#define CPPMAGIC_EVAL256(...) \
+ CPPMAGIC_EVAL128(CPPMAGIC_EVAL128(__VA_ARGS__))
+#define CPPMAGIC_EVAL512(...) \
+ CPPMAGIC_EVAL256(CPPMAGIC_EVAL256(__VA_ARGS__))
+#define CPPMAGIC_EVAL1024(...) \
+ CPPMAGIC_EVAL512(CPPMAGIC_EVAL512(__VA_ARGS__))
+#define CPPMAGIC_EVAL(...) CPPMAGIC_EVAL1024(__VA_ARGS__)
+
+/**
+ * CPPMAGIC_DEFER1, CPPMAGIC_DEFER2 - defer expansion
+ */
+#define CPPMAGIC_DEFER1(a_) a_ CPPMAGIC_NOTHING()
+#define CPPMAGIC_DEFER2(a_) a_ CPPMAGIC_NOTHING CPPMAGIC_NOTHING()()
+
+/**
+ * CPPMAGIC_MAP - iterate another macro across arguments
+ * @m: name of a one argument macro
+ *
+ * CPPMAGIC_MAP(@m, @a1, @a2, ... @an)
+ * expands to the expansion of @m(@a1) , @m(@a2) , ... , @m(@an)
+ */
+#define _CPPMAGIC_MAP_() _CPPMAGIC_MAP
+#define _CPPMAGIC_MAP(m_, a_, ...) \
+ m_(a_) \
+ CPPMAGIC_IFELSE(CPPMAGIC_NONEMPTY(__VA_ARGS__)) \
+ (, CPPMAGIC_DEFER2(_CPPMAGIC_MAP_)()(m_, __VA_ARGS__)) \
+ ()
+#define CPPMAGIC_MAP(m_, ...) \
+ CPPMAGIC_IFELSE(CPPMAGIC_NONEMPTY(__VA_ARGS__)) \
+ (CPPMAGIC_EVAL(_CPPMAGIC_MAP(m_, __VA_ARGS__))) \
+ ()
+
+/**
+ * CPPMAGIC_2MAP - iterate another macro across pairs of arguments
+ * @m: name of a two argument macro
+ *
+ * CPPMAGIC_2MAP(@m, @a1, @b1, @a2, @b2, ..., @an, @bn)
+ * expands to the expansion of
+ * @m(@a1, @b1) , @m(@a2, @b2) , ... , @m(@an, @bn)
+ */
+#define _CPPMAGIC_2MAP_() _CPPMAGIC_2MAP
+#define _CPPMAGIC_2MAP(m_, a_, b_, ...) \
+ m_(a_, b_) \
+ CPPMAGIC_IFELSE(CPPMAGIC_NONEMPTY(__VA_ARGS__)) \
+ (, CPPMAGIC_DEFER2(_CPPMAGIC_2MAP_)()(m_, __VA_ARGS__)) \
+ ()
+#define CPPMAGIC_2MAP(m_, ...) \
+ CPPMAGIC_IFELSE(CPPMAGIC_NONEMPTY(__VA_ARGS__)) \
+ (CPPMAGIC_EVAL(_CPPMAGIC_2MAP(m_, __VA_ARGS__))) \
+ ()
+
+/**
+ * CPPMAGIC_JOIN - separate arguments with given delimiter
+ * @d: delimiter
+ *
+ * CPPMAGIC_JOIN(@d, @a1, @a2, ..., @an)
+ * expands to the expansion of @a1 @d @a2 @d ... @d @an
+ */
+#define _CPPMAGIC_JOIN_() _CPPMAGIC_JOIN
+#define _CPPMAGIC_JOIN(d_, a_, ...) \
+ a_ \
+ CPPMAGIC_IFELSE(CPPMAGIC_NONEMPTY(__VA_ARGS__)) \
+ (d_ CPPMAGIC_DEFER2(_CPPMAGIC_JOIN_)()(d_, __VA_ARGS__)) \
+ ()
+#define CPPMAGIC_JOIN(d_, ...) \
+ CPPMAGIC_IFELSE(CPPMAGIC_NONEMPTY(__VA_ARGS__)) \
+ (CPPMAGIC_EVAL(_CPPMAGIC_JOIN(d_, __VA_ARGS__))) \
+ ()
+
#endif /* CCAN_CPPMAGIC_H */