u/ManagementOpposite61

int chunk_start_commpar(const void* a,const void* b){

    const Chunk *a_chunk =a;
    const Chunk *b_chunk =b;
    return (*a_chunk).start - (*b_chunk).start ;
}

int chunk_list_find (Chunk_List* list ,void* ptr){//we use int as return variable type -1 if nothing found, 1 otherwise
    Chunk key ={
        .start =ptr
      
    };
 
    Chunk* result = bsearch(&key,list->chunks,list->count,sizeof(list->chunks[0]),chunk_start_commpar
    );

 return (result - list->chunks) / sizeof(list->chunks[0]) ;    } return (result - list->chunks) / sizeof(list->chunks[0]) ;
   
    
}

If i were to remove the const from the comapre fucntion the code gives an error: 
 "passing argument 5 of ‘bsearch’ from incompatible pointer type [-Wincompatible-pointer-

Why is adding const to the inputs even important, we are'nt changing anything about a,b