3.0模仿object-c的痕迹少了,看上去更C++了,这是官方说滴。
object减少了那么多复杂的功能,我认为还得拆分。不过cocos2d-x正朝着这个方向努力。
比如原来的object:public copying就被干掉了。并不是一切东西我们都希望可拷贝的。
现在换成了组合的模式,比如:
class CC_DLL Array : public Object, public Clonable
Clonable是个纯虚类:
/** Interface that defines how to clone an object */ class CC_DLL Clonable { public: /** returns a copy of the object */ virtual Clonable* clone() const = 0; /** * @js NA * @lua NA */ virtual ~Clonable() {}; /** returns a copy of the object. @deprecated Use clone() instead */ CC_DEPRECATED_ATTRIBUTE Object* copy() const { // use "clone" instead CC_ASSERT(false); return nullptr;
而要如果要拷贝,怎么搞呢,官方的API是好例子:
class CC_DLL Array : public Object, public Clonable { public: Array* Array::clone() const { Array* ret = new Array(); ret->autorelease(); ret->initWithCapacity(this->data.size() > 0 ? this->data.size() : 1); Object* obj = nullptr; Object* tmpObj = nullptr; Clonable* clonable = nullptr; CCARRAY_FOREACH(this, obj) { clonable = dynamic_cast<Clonable*>(obj); if (clonable) { tmpObj = dynamic_cast<Object*>(clonable->clone()); if (tmpObj) { ret->addObject(tmpObj); } } else { CCLOGWARN("%s isn't clonable.", typeid(*obj).name()); } } return ret; } }
就是一个深拷贝。额,没什么再说的了。