defs: remove useless definitions

include/gint/defs/util.h

@@ -2,6 +2,9 @@
 //	gint:defs:util - Various utility macros
 //---
 
+#ifndef GINT_DEFS_UTIL
+#define GINT_DEFS_UTIL
+
 /* min(), max() (without double evaluation) */
 #define	min(a, b) ({			\
 	__auto_type _a = (a);		\
@@ -35,33 +38,4 @@
 	(b) = _tmp;			\
 })
 
-//---
-//	Const casts
-//---
-
-/* const_cast() - perform const casts
-   This is intended for initialization purposes only, like "final" in Java.
-   This macro is the most generic form without any type inference; using
-   const_cint() or const_cptr() may be more convenient for simple types */
-#define const_cast(x, T) (*((T *)(&(x))))
-
-/* const_cptr() - perform const casts on pointers */
-#define const_cptr(x) (*((void **)(&(x))))
-
-/* const_cint() - perform const casts on integers
-   This macro infers the integer type it's using, which may avoid errors when
-   types change during code maintenance. It only works on primitive types and
-   their aliases, this is on purpose to avoid integer coercion with tricks such
-   as typeof(x + 0). */
-#define const_cint(x) (*_Generic((x),					\
-	char:			(char *)		(&(x)),		\
-	unsigned char:		(unsigned char *)	(&(x)),		\
-	short:			(short *)		(&(x)),		\
-	unsigned short:		(unsigned short *)	(&(x)),		\
-	int:			(int *)			(&(x)),		\
-	unsigned int:		(unsigned int *)	(&(x)),		\
-	long:			(long *)		(&(x)),		\
-	unsigned long:		(unsigned long *)	(&(x)),		\
-	long long:		(long long *)		(&(x)),		\
-	unsigned long long:	(unsigned long long *)	(&(x))		\
-))
+#endif /* GINT_DEFS_UTIL */