X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=typesafe_cb%2Ftypesafe_cb.h;fp=typesafe_cb%2Ftypesafe_cb.h;h=0000000000000000000000000000000000000000;hp=cc4ea8adbb9fba319e9ac0d5e45d13ca7dae6456;hb=650c775ff00cccd03fc84e7789a03c51d9839004;hpb=c8acddea39d222312102952e91c32cfe4dd2cea0

diff --git a/typesafe_cb/typesafe_cb.h b/typesafe_cb/typesafe_cb.h
deleted file mode 100644
index cc4ea8ad..00000000
--- a/typesafe_cb/typesafe_cb.h
+++ /dev/null
@@ -1,120 +0,0 @@
-#ifndef CCAN_CAST_IF_TYPE_H
-#define CCAN_CAST_IF_TYPE_H
-#include "config.h"
-
-#if HAVE_TYPEOF && HAVE_BUILTIN_CHOOSE_EXPR && HAVE_BUILTIN_TYPES_COMPATIBLE_P
-/**
- * cast_if_type - only cast an expression if it is of a given type
- * @expr: the expression to cast
- * @oktype: the type we allow
- * @desttype: the type to cast to
- *
- * This macro is used to create functions which allow multiple types.
- * The result of this macro is used somewhere that a @desttype type is
- * expected: if @expr was of type @oktype, it will be cast to
- * @desttype type.  As a result, if @expr is any type other than
- * @oktype or @desttype, a compiler warning will be issued.
- *
- * This macro can be used in static initializers.
- *
- * This is merely useful for warnings: if the compiler does not
- * support the primitives required for cast_if_type(), it becomes an
- * unconditional cast, and the @oktype argument is not used.  In
- * particular, this means that @oktype can be a type which uses
- * the "typeof": it will not be evaluated if typeof is not supported.
- *
- * Example:
- *	// We can take either an unsigned long or a void *.
- *	void _set_some_value(void *val);
- *	#define set_some_value(expr)			\
- *		_set_some_value(cast_if_type((expr), unsigned long, void *))
- */
-#define cast_if_type(expr, oktype, desttype)				\
-__builtin_choose_expr(__builtin_types_compatible_p(typeof(1?(expr):0), oktype), \
-			(desttype)(expr), (expr))
-#else
-#define cast_if_type(expr, oktype, desttype) ((desttype)(expr))
-#endif
-
-/**
- * typesafe_cb - cast a callback function if it matches the arg
- * @rettype: the return type of the callback function
- * @fn: the callback function to cast
- * @arg: the (pointer) argument to hand to the callback function.
- *
- * If a callback function takes a single argument, this macro does
- * appropriate casts to a function which takes a single void * argument if the
- * callback provided matches the @arg (or a const or volatile version).
- *
- * It is assumed that @arg is of pointer type: usually @arg is passed
- * or assigned to a void * elsewhere anyway.
- *
- * Example:
- *	void _register_callback(void (*fn)(void *arg), void *arg);
- *	#define register_callback(fn, arg) \
- *		_register_callback(typesafe_cb(void, (fn), (arg)), (arg))
- */
-#define typesafe_cb(rettype, fn, arg)					\
-	cast_if_type(cast_if_type(cast_if_type((fn),			\
-					       rettype (*)(const typeof(arg)), \
-					       rettype (*)(void *)),	\
-				  rettype (*)(volatile typeof(arg)),	\
-				  rettype (*)(void *)),			\
-		     rettype (*)(typeof(arg)),				\
-		     rettype (*)(void *))
-
-/**
- * typesafe_cb_preargs - cast a callback function if it matches the arg
- * @rettype: the return type of the callback function
- * @fn: the callback function to cast
- * @arg: the (pointer) argument to hand to the callback function.
- *
- * This is a version of typesafe_cb() for callbacks that take other arguments
- * before the @arg.
- *
- * Example:
- *	void _register_callback(void (*fn)(int, void *arg), void *arg);
- *	#define register_callback(fn, arg) \
- *		_register_callback(typesafe_cb_preargs(void, (fn), (arg), int),\
- *				   (arg))
- */
-#define typesafe_cb_preargs(rettype, fn, arg, ...)			\
-	cast_if_type(cast_if_type(cast_if_type((fn),			\
-					       rettype (*)(__VA_ARGS__,	\
-							   const typeof(arg)), \
-					       rettype (*)(__VA_ARGS__,	\
-							   void *)),	\
-				  rettype (*)(__VA_ARGS__,		\
-					      volatile typeof(arg)),	\
-				  rettype (*)(__VA_ARGS__, void *)),	\
-		     rettype (*)(__VA_ARGS__, typeof(arg)),		\
-		     rettype (*)(__VA_ARGS__, void *))
-
-/**
- * typesafe_cb_postargs - cast a callback function if it matches the arg
- * @rettype: the return type of the callback function
- * @fn: the callback function to cast
- * @arg: the (pointer) argument to hand to the callback function.
- *
- * This is a version of typesafe_cb() for callbacks that take other arguments
- * after the @arg.
- *
- * Example:
- *	void _register_callback(void (*fn)(void *arg, int), void *arg);
- *	#define register_callback(fn, arg) \
- *		_register_callback(typesafe_cb_preargs(void, (fn), (arg), int),\
- *				   (arg))
- */
-#define typesafe_cb_postargs(rettype, fn, arg, ...)			\
-	cast_if_type(cast_if_type(cast_if_type((fn),			\
-					       rettype (*)(const typeof(arg), \
-							   __VA_ARGS__), \
-					       rettype (*)(void *,	\
-							   __VA_ARGS__)), \
-				  rettype (*)(volatile typeof(arg),	\
-					      __VA_ARGS__),		\
-				  rettype (*)(void *, __VA_ARGS__)),	\
-		     rettype (*)(typeof(arg), __VA_ARGS__),		\
-		     rettype (*)(void *, __VA_ARGS__))
-
-#endif /* CCAN_CAST_IF_TYPE_H */