54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
#ifndef MAG_HANDLE_H
|
|
#define MAG_HANDLE_H
|
|
|
|
#ifdef __cplusplus
|
|
#error "handle.h does not work with C++ compilers, you must compile these files with GCC directly!"
|
|
#endif
|
|
|
|
/** Tells your constructor/destructor handler function about the state */
|
|
enum HANDLE_STATE {
|
|
HANDLE_CREAT,
|
|
HANDLE_DESTR
|
|
};
|
|
|
|
#define creat(TNAME, VNAME, VINIT) \
|
|
[[gnu::always_inline]] inline void VNAME##_cleanuper(struct TNAME *v) { \
|
|
TNAME##_lifetime_handler(HANDLE_DESTR, v, NULL); \
|
|
} \
|
|
[[gnu::cleanup(VNAME##_cleanuper)]] struct TNAME VNAME; \
|
|
TNAME##_lifetime_handler(HANDLE_CREAT, & VNAME, VINIT);
|
|
|
|
#define handle(TNAME) \
|
|
static inline void TNAME##_lifetime_handler( \
|
|
enum HANDLE_STATE state, \
|
|
struct TNAME *this, \
|
|
void *data)
|
|
/*
|
|
* EXAMPLE:
|
|
*
|
|
* struct Meaning {
|
|
* int a;
|
|
* int b;
|
|
* };
|
|
* // You should not typedef this EVER!
|
|
*
|
|
* handle(Meaning) {
|
|
* if(state == HANDLE_CREAT) {
|
|
* this->a = *(int*) data;
|
|
* this->b = 2;
|
|
* } else {
|
|
* printf("%d\n", this->a + this->b);
|
|
* }
|
|
* }
|
|
*
|
|
* // Now you can use a handle in your local scopes
|
|
* // Should print 42:
|
|
* int main() {
|
|
* int initializer = 40;
|
|
* creat(Meaning, d, &initializer);
|
|
* }
|
|
*
|
|
* Rem.: Unrelated trick, but you can typedef struct A A; // both typedef and forward declare
|
|
*/
|
|
#endif // MAG_HANDLE_H
|