请求成员不是结构或联合错误

Question

I searched the net for the above error, but people mainly talking about the wrong way of access the fields of the struct (-> vs .). I tried them, but still I keep receiving the same error. I have these two structs:

struct Node_ {
    int num;
    G12_t* G12;
}node_t;

struct G12_{
    int level;
    int size;
    G12_t* next;
}G12_t;

When I want to get access to the level field of G12_t in a node_t, I get the above error. I access to the level field as bellow:

node_t* pNode;

pNode->G12->level = 0;

Answer 1

It looks like you were attempting to create typedefs for these two types, but you didn't use the typedef keyword. What you did instead was create an instance of struct G12_ called G12_t and an instance of struct Node_ called node_t .

You need to add the typedef keyword before each one. Also, you need to define G12_t before node_t , since the latter uses the former, and you can use the G12_t name inside the struct where it's defined. You need to use the full struct name:

typedef struct G12_{
    int level;
    int size;
    struct G12_* next;
}G12_t;

typedef struct Node_ {
    int num;
    G12_t* G12;
}node_t;