#define CPPMAGIC_ISEMPTY(...) \
CPPMAGIC_ISZERO(CPPMAGIC_NONEMPTY(__VA_ARGS__))
+/*
+ * CPPMAGIC_IFELSE - preprocessor conditional
+ *
+ * CPPMAGIC_IFELSE(@cond)(@if)(@else)
+ * expands to @else if @cond is '0', otherwise expands to @if
+ */
+#define _CPPMAGIC_IF_0(...) _CPPMAGIC_IF_0_ELSE
+#define _CPPMAGIC_IF_1(...) __VA_ARGS__ _CPPMAGIC_IF_1_ELSE
+#define _CPPMAGIC_IF_0_ELSE(...) __VA_ARGS__
+#define _CPPMAGIC_IF_1_ELSE(...)
+#define _CPPMAGIC_IFELSE(cond_) CPPMAGIC_GLUE2(_CPPMAGIC_IF_, cond_)
+#define CPPMAGIC_IFELSE(cond_) \
+ _CPPMAGIC_IFELSE(CPPMAGIC_NONZERO(cond_))
+
#endif /* CCAN_CPPMAGIC_H */
int main(void)
{
- plan_tests(21);
+ plan_tests(24);
CHECK1(CPPMAGIC_NOTHING(), "");
CHECK1(CPPMAGIC_GLUE2(a, b), "ab");
CHECK1(CPPMAGIC_ISEMPTY(0), "0");
CHECK1(CPPMAGIC_ISEMPTY(a, b, c), "0");
+ CHECK1(CPPMAGIC_IFELSE(0)(abc)(def), "def");
+ CHECK1(CPPMAGIC_IFELSE(1)(abc)(def), "abc");
+ CHECK1(CPPMAGIC_IFELSE(not zero)(abc)(def), "abc");
+
/* This exits depending on whether all tests passed */
return exit_status();
}