u014257954的专栏

来自九章算法: C++的代码: class Solution { public: static Solution * instance; Solution(){} static Solution* getInstance(); }; Solution* Solution::getInstance(){ if (NULL == instance) {

C++代码： /** * Your object will be instantiated and called as such: * ShapeFactory* sf = new ShapeFactory(); * Shape* shape = sf->getShape(shapeType); * shape->draw(); */ class Shape { public: