From d53ac76f78762b7bfd395576fd2ba5ed39f515c1 Mon Sep 17 00:00:00 2001 From: kartofen Date: Tue, 30 May 2023 23:14:30 +0300 Subject: templates in c --- c-templates.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 c-templates.c (limited to 'c-templates.c') 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 + +// 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; +} -- cgit v1.2.3