Method random_parent_block

src/Block.cpp:339–354

* return a random parent block (including itself) or the global block (if 0 is returned) */

 * return a random parent block (including itself) or the global block (if 0 is returned)
 */
Block*
Block::random_parent_block(void)
{
	vector<Block*> blks;
	if (CGOptions::global_variables()) {
		blks.push_back(NULL);
	}
	Block* tmp = this;
	while (tmp) {
		blks.push_back(tmp);
		tmp = tmp->parent;
	}
	int index = rnd_upto(blks.size());
	ERROR_GUARD(NULL);
	return blks[index];
}

/*
 * return true if there is no way out of this block other than function return