Using a structure definition in c -

i defined structures in c this:

struct cache_line{     char valid;     int tag;     int lru; };   struct cache_set{     struct cache_line *lines; };   struct cache{     struct cache_set *sets; }; 

after these structures definitions, define function:

void do_something(struct cache_set *a_cache_set, int number){             *a_cache_set.lines[next].tag = tag;             *a_cache_set.lines[next].lru = *current_count;             *a_cache_set.lines[next].valid = 1; } 

in main, define cache_set , do:

struct cache_set a_cache_set = my_cache.sets[setid]; int a_number  = 10;  do_something(&a_cache_set, a_number); 

however, when compiling, following error @ do_something definition (at

        *a_cache_set.lines[next].tag = tag;         *a_cache_set.lines[next].lru = *current_count;         *a_cache_set.lines[next].valid = 1; 

) :

error: request member ‘lines’ in not structure or union 

yet, explicitly declared a_cache_set cache set contains lines...

what wrong here?

this operator precedence issue.

    *a_cache_set.lines[next].tag = tag;     *a_cache_set.lines[next].lru = *current_count;     *a_cache_set.lines[next].valid = 1; 

is equivalent to

    *(a_cache_set.lines[next].tag) = tag;     *(a_cache_set.lines[next].lru) = *current_count;     *(a_cache_set.lines[next].valid) = 1; 

what need is:

    (*a_cache_set).lines[next].tag = tag;     (*a_cache_set).lines[next].lru = *current_count;     (*a_cache_set).lines[next].valid = 1; 

or, better,

    a_cache_set->lines[next].tag = tag;     a_cache_set->lines[next].lru = *current_count;     a_cache_set->lines[next].valid = 1;