Move modules to ccan/ tools to tools/

[ccan] / typesafe_cb / typesafe_cb.h

diff --git a/typesafe_cb/typesafe_cb.h b/typesafe_cb/typesafe_cb.h
deleted file mode 100644 (file)
index cc4ea8a..0000000
--- 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 */