Thread: Basic pointers to structures question...

header:

Code:

struct termlist
{
      uint32_t num_terms; 
      char **term;           
};

int getMetaData( uint32_t specific_tag, termlist **terms);

main:

Code:

int main(int argc, char **argv)
{

uint32_t specificTag;
specificTag = atoi(argv[1]);

termlist *sample1;

getMetaData( specificTag, sample1 );

...

}

Hi, I'm really confused about pointers to structures. I'm trying to understand this snippet of code above.

The function prototype requires a double pointer to the structure, termlist **terms. But in main when calling the function only a pointer to the structure is passed, sample1.

I'm quite confused on how the function prototype requires a double pointer, but in main only a single pointer is passed.


Thanks!