types are as easy to implement as parsing the value in the handler function.
Real game engines use this pattern (or its 3D cousin, the Octree) for broad-phase collision detection: the quadtree quickly identifies candidate pairs, and a more expensive narrow-phase check tests the actual geometry.
。业内人士推荐体育直播作为进阶阅读
To be even cooler, try the Plan 9-like approach using the Eshell
第一百三十七条 出租人应当在合同约定的卸货港卸货。合同订有承租人选择卸货港条款的，在承租人未按照合同约定及时通知确定的卸货港时，船长可以从约定的选卸港中自行选定一港卸货。承租人未按照合同约定及时通知确定的卸货港，致使出租人遭受损失的，应当承担赔偿责任。出租人未按照合同约定，擅自选定港口卸货致使承租人遭受损失的，应当承担赔偿责任。