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