templates in cHEADmaster

1 files changed, 34 insertions, 0 deletions

diff --git a/c-templates.c b/c-templates.c
new file mode 100644
index 0000000..d9f9846
--- /dev/null
+++ b/c-templates.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+
+// Build using:
+//   gcc -E -CC c-templates.c | gcc -E -CC -DDEFINE=\#define -xc - | gcc --std=gnu99 -xc -
+
+#define TEMPLATE_VA_ARGS __VA_ARGS__
+#define template(name, ...) /*
+*/ DEFINE name(types, ...) __TEMPLATE_##name types f(TEMPLATE_VA_ARGS); }) /*
+*/ DEFINE __TEMPLATE_##name(__VA_ARGS__) ({
+
+// template syntax:
+//   declare: template(name, ... types) return_t f(... args) { ... body }
+//   call:    name((... types), ... args)
+
+template(print_hex, T) void f(T c)       /*
+*/{                                      /*
+*/    printf("%x\n", c);                 /*
+*/}
+
+template(max, T) T f(T a, T b)           /*
+*/{                                      /*
+*/    return (a > b) ? a : b;            /*
+*/}
+
+int main(void)
+{
+    print_hex((int), 16);
+    print_hex((int), '\n');
+
+    printf("%d\n", max((int), 5, 10));
+    printf("%f\n", max((float), 362.38098f, 7.4323f));
+    printf("%ld\n", max((long), 409343432, 430483249));
+    return 0;
+}