exception.dc

来自「Object-Oriented Programming With ANSI-C这」· DC 代码 · 共 42 行

#include "List.h"

static void * stack;

% Exception ctor {
	void * self = super_ctor(Exception(), _self, app);

	if (! stack)
		stack = new(List(), 10);
	addLast(stack, self);
	return self;
}

% Exception dtor {
	void * top;
%casts
	assert(stack);
	top = takeLast(stack);
	assert(top == self);
	return super_dtor(Exception(), self);
}

% catchException {
%casts
	self -> armed = 1;
	return self -> label;
}

void cause (int number) {
	unsigned cnt;

	if (number && stack && (cnt = count(stack)))
	{	void * top = lookAt(stack, cnt-1);
		struct Exception * e = cast(Exception(), top);

		if (e -> armed)
			longjmp(e -> label, number);
	}
}

%init