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class like structures in c
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| #include <stdio.h> | |
| //define a struct to contain variables and function pointers, much like a class | |
| typedef struct ex { | |
| //declare some variables | |
| int x; | |
| //declare some methods (aka, function pointers) | |
| void (*const p)(void); //let p be a constant pointer | |
| void (*const setX)(struct ex *, int); //must pass self-referential pointer to imitate class scope | |
| int (*const getX)(const struct ex *); | |
| } ExClass; | |
| //function prototypes | |
| ExClass initialize(); //like a constructor | |
| void print(void); | |
| void setX(ExClass *, int); | |
| int getX(const ExClass *); | |
| //function definitions | |
| ExClass initialize() { | |
| ExClass c = {0, print, setX, getX}; | |
| return c; | |
| } | |
| void print(void) { | |
| printf("Just a generic print statement\n"); | |
| } | |
| void setX(ExClass *this, int v) { | |
| this->x = v; | |
| } | |
| int getX(const ExClass *this) { | |
| return this->x; | |
| } | |
| int main(void) { | |
| ExClass e = initialize(); //call constructor | |
| e.setX(&e, 100); | |
| e.p(); | |
| printf("Value of e.x = %d\n", e.getX(&e)); | |
| return 0; | |
| } |
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