C ++通过智能指针的向量迭代 [英] C++ Iterating through a vector of smart pointers

问题描述

我有一个类有这个功能：

i have a class that has this function:

typedef boost::shared_ptr<PrimShapeBase> sp_PrimShapeBase; 



class Control{
     public:
         //other functions
         RenderVectors(SDL_Surface*destination, sp_PrimShapeBase);
     private:
         //other vars
          vector<sp_PrimShapeBase> LineVector;

};

//the problem of the program

void Control::RenderVectors(SDL_Surface*destination, sp_PrimShapeBase){
    vector<sp_PrimShapeBase>::iterator i;

    //iterate through the vector
    for(i = LineVector.begin(); i != LineVector.end(); i ++ ){
      //access a certain function of the class PrimShapeBase through the smart
      //pointers
      (i)->RenderShape(destination); 

    }
}

编译器告诉我类boost :: shared_ptr
没有名为RenderShape的成员，我觉得奇怪，因为
类PrimShapeBase肯定有这个函数，但是在一个不同的头文件。
这是什么原因？

The compiler tells me that the class boost::shared_ptr has no member called 'RenderShape' which I find bizarre since the class PrimShapeBase certainly has that function but is in a different header file. What is the cause of this?

推荐答案

不是指

(*i)->RenderShape(destination); 

？

i 是迭代器， * i 是 shared_ptr ，（* i）:: operator->（）是对象。

i is the iterator, *i is the shared_ptr, (*i)::operator->() is the object.

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