I'm attempting to create a dictionary using a hash-table, and so I've created a structure called node that has a word and a next pointer associated with it:
// Represents a node in a hash table
typedef struct node
{
char word[LENGTH + 1];
struct node *next;
}
node;
// Hash table
struct node *table[5];
In main, I've initialised a node, and am now attempting to load it into the hash-table:
void hash_insert_node(struct node **hash_table, struct node *n, int value)
{
hash_table[value] = n;
printf("%s\n", hash_table[value]->word);
}
I have prototype for this function in a file named dictionaries.h, and this code in a file named dictionaries.c. At the top of dictionaries.c, I have
#include "dictionaries.h"
If I run the code now, I get the following error:
declaration of 'struct node' will not be visible outside of this function [-Werror,-Wvisibility]
The only way I've found to resolve this is to move the definition of the structure to dictionaries.h, but that seems silly.
This may be a trivial question, but I'd greatly appreciate any help.
The only way I've found to resolve this is to move the definition of the structure to dictionaries.h, but that seems silly.
It doesn't seem silly to me, a .h file seems a perfectly good place to place a struct declaration.
The problem arises because your function is not aware of the existance of the struct.
You can solve this in some different ways:
struct before the declaration of the function, i.e.: struct node;
char *GetHashWord(struct node **hash_table, int value);
struct in a separate .h file which you could name, for instance, data_structure.h and #include it in dictionaries.h.On a side note, if you are going to give an alias to your struct you may as well use it:
void hash_insert_node(node **hash_table, node *n, int value){/*...*/}
^^^^ ^^^^