typedef struct nested pointer undefined error

Question

Im making a linked list using a typedef'ed struct, but the compiler is telling my that my new type is undefined.

typedef struct valholder
{
    char* id;
    union
    {
        int ival;
        float fval;
        char* cval;
    };
    valholder* next;
};

How do I fix this?

Answer 1

The syntax for typedef is:

typedef <type> <alias>

Where <type> is an existing type name or a type expression (like struct {...}) and <alias> is the new type name.

Here's one way of defining your data strucure without referring to the alias:

typedef struct valholder_s {
  char* id;
  union {
     int ival;
     float fval;
     char* cval;
  };
  struct valholder_s* next;
} valholder;

Answer 2

Try this:

   typedef struct valholder
    {
        char* id;
        union
        {
            int ival;
            float fval;
            char* cval;
        };
        struct valholder* next;
    } valholder;