c++智能指针，new之后不需要delete，简单的垃圾回收

http://www.cnblogs.com/TenosDoIt/p/3456704.html

智能指针的初始化：

错误：

std::shared_ptr<Serializer> serializerObj2(new Serializer)

正确：

std::shared_ptr<Serializer> serializerObj2 = new Serializer;

std::shared_ptr<Serializer> serializerObj2{new Serializer};