'.Position'左侧必须具有类/结构/联合

Question

typedef struct {
    unsigned short int Position; // << That's what i'm trying to change!
    unsigned short int OldPosition;
} Turn_s;
struct Turn_sMap{
    Turn_s *Turn;
    Turn_sMap *NextTurn;
};
New = new Turn_sMap;
New->Turn = new Turn_s;
New->Turn.Position = 0; // Already tried (New->Turn).Position = 0;

为什么我会收到编译错误？我是否没有访问结构 在结构内转动 New，而结构又有一个名为 Position 的成员？还是 typedef 会用一些指针疯狂来弄乱结构类型？请帮帮，我迷路了！):

Answer 1

声明

Turn_s *Turn;使Turn成为指针类型。若要访问成员对象，需要使用->运算符。尝试：

New->Turn->Position = 0;

Answer 2

Turn_sMap::Turn是一个指针。您需要取消引用它：

New->Turn->Position = 0; 

此外，您不应该在C++中使用typedef struct。只需声明结构：

struct Turn_s {
    unsigned short int Position; // << That's what i'm trying to change!
    unsigned short int OldPosition;
};
Turn_s a;
foo(a);