new.c

#include <stdlib.h>
#include <stdio.h>

#define new(TYPE, ARGS...) ({\
		TYPE *item = ( TYPE *)malloc(sizeof( TYPE )); \
		item->init = &TYPE##Init; \
		item->init(item, ARGS); \
		item; \
		})

typedef struct {
	int scancode;
	int shift;
	int control;

	// constructor
	void(*init)(void*, int, int, int);
} KeyEvent;

// Constructor
void KeyEventInit(void* st, int scancode, int shift, int control) {
	KeyEvent* ke = (KeyEvent*)st;
	ke->scancode = scancode;
	ke->shift = shift;
	ke->control = control;
}

int main() {
	KeyEvent* a = new(KeyEvent, 1, 2, 3);
	printf("scancode = %i, shift = %i, control = %i\n", a->scancode, a->shift, a->control);
	return 0;
}