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object: Move OO programming helper macros to a separate header file

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This commit is contained in:
Martin Willi
2015-04-16 14:50:05 +02:00
parent 1e02eddb72
commit 1f2326ce58
3 changed files with 128 additions and 107 deletions
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src/libstrongswan/utils/utils.h
+1 -106
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@@ -82,6 +82,7 @@
#include "utils/memory.h"
#include "utils/strerror.h"
#include "utils/status.h"
#include "utils/object.h"
#include "utils/path.h"
#include "utils/tty.h"
#ifdef __APPLE__
@@ -114,112 +115,11 @@ void utils_deinit();
typeof(y) _y = (y); \
_x < _y ? _x : _y; })
/**
* Call destructor of an object, if object != NULL
*/
#define DESTROY_IF(obj) if (obj) (obj)->destroy(obj)
/**
* Call offset destructor of an object, if object != NULL
*/
#define DESTROY_OFFSET_IF(obj, offset) if (obj) obj->destroy_offset(obj, offset);
/**
* Call function destructor of an object, if object != NULL
*/
#define DESTROY_FUNCTION_IF(obj, fn) if (obj) obj->destroy_function(obj, fn);
/**
* Debug macro to follow control flow
*/
#define POS printf("%s, line %d\n", __FILE__, __LINE__)
/**
* Object allocation/initialization macro, using designated initializer.
*/
#define INIT(this, ...) { (this) = malloc(sizeof(*(this))); \
*(this) = (typeof(*(this))){ __VA_ARGS__ }; }
/**
* Aligning version of INIT().
*
* The returned pointer must be freed using free_align(), not free().
*
* @param this object to allocate/initialize
* @param align alignment for allocation, in bytes
* @param ... initializer
*/
#define INIT_ALIGN(this, align, ...) { \
(this) = malloc_align(sizeof(*(this)), align); \
*(this) = (typeof(*(this))){ __VA_ARGS__ }; }
/**
* Object allocation/initialization macro, with extra allocated bytes at tail.
*
* The extra space gets zero-initialized.
*
* @param this pointer to object to allocate memory for
* @param extra number of bytes to allocate at end of this
* @param ... initializer
*/
#define INIT_EXTRA(this, extra, ...) { \
typeof(extra) _extra = (extra); \
(this) = malloc(sizeof(*(this)) + _extra); \
*(this) = (typeof(*(this))){ __VA_ARGS__ }; \
memset((this) + 1, 0, _extra); }
/**
* Aligning version of INIT_EXTRA().
*
* The returned pointer must be freed using free_align(), not free().
*
* @param this object to allocate/initialize
* @param extra number of bytes to allocate at end of this
* @param align alignment for allocation, in bytes
* @param ... initializer
*/
#define INIT_EXTRA_ALIGN(this, extra, align, ...) { \
typeof(extra) _extra = (extra); \
(this) = malloc_align(sizeof(*(this)) + _extra, align); \
*(this) = (typeof(*(this))){ __VA_ARGS__ }; \
memset((this) + 1, 0, _extra); }
/**
* Method declaration/definition macro, providing private and public interface.
*
* Defines a method name with this as first parameter and a return value ret,
* and an alias for this method with a _ prefix, having the this argument
* safely casted to the public interface iface.
* _name is provided a function pointer, but will get optimized out by GCC.
*/
#define METHOD(iface, name, ret, this, ...) \
static ret name(union {iface *_public; this;} \
__attribute__((transparent_union)), ##__VA_ARGS__); \
static typeof(name) *_##name = (typeof(name)*)name; \
static ret name(this, ##__VA_ARGS__)
/**
* Same as METHOD(), but is defined for two public interfaces.
*/
#define METHOD2(iface1, iface2, name, ret, this, ...) \
static ret name(union {iface1 *_public1; iface2 *_public2; this;} \
__attribute__((transparent_union)), ##__VA_ARGS__); \
static typeof(name) *_##name = (typeof(name)*)name; \
static ret name(this, ##__VA_ARGS__)
/**
* Callback declaration/definition macro, allowing casted first parameter.
*
* This is very similar to METHOD, but instead of casting the first parameter
* to a public interface, it uses a void*. This allows type safe definition
* of a callback function, while using the real type for the first parameter.
*/
#define CALLBACK(name, ret, param1, ...) \
static ret _cb_##name(union {void *_generic; param1;} \
__attribute__((transparent_union)), ##__VA_ARGS__); \
static typeof(_cb_##name) *name = (typeof(_cb_##name)*)_cb_##name; \
static ret _cb_##name(param1, ##__VA_ARGS__)
/**
* This macro allows counting the number of arguments passed to a macro.
* Combined with the VA_ARGS_DISPATCH() macro this can be used to implement
@@ -262,11 +162,6 @@ void utils_deinit();
*/
#define ignore_result(call) { if(call){}; }
/**
* Assign a function as a class method
*/
#define ASSIGN(method, function) (method = (typeof(method))function)
/**
* time_t not defined
*/