Similarly, the code labelled “Block 3” will run when the tree is not empty, and when this frame’s child invocation is not yet complete. In this case we pass the accumulator and the tree’s contents into fn and then call the fold forest function with the new accumulator. This “call” is done by creating a stack frame for the child invocation and transferring control to it, using frame = frame.child. Again, logically, this matches the second case of the recursive implementation.
Random Thoughts。新收录的资料是该领域的重要参考
마감까지 공천신청 안한 오세훈… 吳측 “중대결단 배제 안해”。新收录的资料对此有专业解读
我可能还会记一些细枝末节的地方。就像我记得刘心武《钟鼓楼》里杀鱼的场景，因此再也不敢吃鱼。