From d53ac76f78762b7bfd395576fd2ba5ed39f515c1 Mon Sep 17 00:00:00 2001
From: kartofen <mladenovnasko0@gmail.com>
Date: Tue, 30 May 2023 23:14:30 +0300
Subject: templates in c

---
 Makefile      |  9 +++++++--
 c-templates.c | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 2 deletions(-)
 create mode 100644 c-templates.c

diff --git a/Makefile b/Makefile
index fc927b7..7a78977 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ CC := gcc
 CFLAGS := -Wall -Wextra -Wpedantic
 BIND := bin
 
-CSRCS = $(shell find . -type f -name '*.c')
+CSRCS = $(shell find * -type f -name '*.c')
 
 .PHONY: all clean
 
@@ -12,6 +12,11 @@ all: $(CSRCS:%.c=$(BIND)/%)
 clean:
 	rm -rf $(BIND)
 
+$(BIND)/c-templates: c-templates.c
+	mkdir -p $(dir $@)
+	gcc -E -CC $^ | gcc -E -CC -DDEFINE=\#define -xc - | gcc $(CFLAGS) --std=gnu99 -o $@ -xc -
+
 $(BIND)/%: %.c
-	mkdir -p $(dir $@)p
+	@echo $@
+	mkdir -p $(dir $@)
 	$(CC) $(CFLAGS) $^ -o $@
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;
+}
-- 
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