如何从C ++函数返回const Float ** [英] How to return const Float** from a C++ function

问题描述

我有一个类，它持有一个数组 float ** table 。现在我想有成员函数返回它，但不希望它在类外部被修改。所以我这样做：

I have a class which hold an array "float ** table". Now I want to have member function to return it, but don't want it to be modified outside of the class. So I did this:

class sometable 
{
  public:
   ...
   void updateTable(......);
   float **getTable() const {return table;}
  private:
    ...
    float **table;
}

当使用常量对象调用getTable时，现在我尝试
通过将getTable声明为 const float ** getTable（）使它更安全。我得到
以下编译错误：

This compiles OK when I call getTable with a constant object. Now I tried to make it safer by declaring getTable as "const float **getTable()". I got the following compilation error:

Error:
  Cannot return float**const from a function that should return const float**.

为什么？

推荐答案

如下声明你的方法：

float const* const* getTable() const {return table;}

或

const float* const* getTable() const {return table;}

。

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