A-M baby

Task/Metaprogramming/C/metaprogramming-1.c

@@ -0,0 +1,12 @@
+// http://stackoverflow.com/questions/3385515/static-assert-in-c
+#define STATIC_ASSERT(COND,MSG) typedef char static_assertion_##MSG[(!!(COND))*2-1]
+// token pasting madness:
+#define COMPILE_TIME_ASSERT3(X,L) STATIC_ASSERT(X,static_assertion_at_line_##L)
+#define COMPILE_TIME_ASSERT2(X,L) COMPILE_TIME_ASSERT3(X,L)
+#define COMPILE_TIME_ASSERT(X)    COMPILE_TIME_ASSERT2(X,__LINE__)
+
+COMPILE_TIME_ASSERT(sizeof(long)==8);
+int main()
+{
+    COMPILE_TIME_ASSERT(sizeof(int)==4);
+}