Using closure and continuation-passing style in C

gistfile1.c

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

typedef struct
{
	char* description;
} event;

typedef void (*fun)();

typedef struct
{
	fun invoke;
} closure;

typedef struct { closure proto; int n; } mymainclosure;

void mymain(closure* self, closure* creturn, closure* cthrow)
{
	if (self->invoke != mymain)
	{
		event exc = {.description = "Badly formed closure in mymain"};
		cthrow->invoke(cthrow, exc);
	}
	else
	{
		int n = ((mymainclosure*) self)->n;
		creturn->invoke(creturn, n+1);
	}
}


int main(int n, char** args)
{
	mymainclosure m = {.proto = {.invoke = mymain}, .n = 6};
	void myreturn(closure* self, int n)
	{
		printf("Returned %d\n", n);
	}
	void mythrow(closure* self, event exc)
	{
		printf("Threw event: %s\n", exc.description);
	}
	
	m.proto.invoke(&m, &(closure){.invoke = myreturn}, &(closure){.invoke = mythrow});
	return 0;
}