🚀 go-pugleaf

I just took a quick look at the code, but I think tha the problem you are
having is caused by the fact that you are not properly dereferencing your
pointer.

for example:

class Foo
    {
    ...
    public:
    void DoSomething();
    };




void TestFunction(Foo* F)
    {
    // to call a method on the object pointed to by F, you normally do it
like this:
    F->DoSomething();
    // NOT F.DoSomething();

    // Alternatively you could ...
    (*F).DoSomething(); //   but that's somewhat convoluted.
    }

// You may also want to use a reference to the created Foo object.

void TestFunction(Foo& F);

This approach has many of the advantages of a pointer.


I hope that helps,







New C Programmer <s_joanis@siebe-ene.com> wrote in message
news:8br6t6$3dc$1@bob.news.rcn.net...
>
> I am having a problem with passing pointers to a class.
>
> I have a class called stack that works fine but when I try to pass a
pointer
> to an instance
>
> of the class it gives me problems.
>
> I need to know how to get to the methods of the object when I get it to
the
> function and
>
> perhaps how to pass it.
>
>
> this is the sending function,
>
> below it is a snipit of the recieving function.
>
> #include "scj_arr.h"
> #include "stack.h"
> #include "ass_out.h"
> #include<iostream.h>
> #include<stdlib.h>
> #include<ctype.h>
> #include<fstream.h>
> #define MAX 50
> // Function Prototypes
> int file_to_stack(stack *my_stack1, stack *my_stack2);
> int order_stack(stack *my_stack1, stack *my_stack2);
> void init_array(const char init_val, char array[], int arr_size);
> int process_command();
> int check_op(char c);
> file://int out_to_file(stack my_stack1, stack my_stack2);
>
>
>
> void main()
> {
>  int test=0;
>  int quit=0;
>  static stack my_stack1;
>  static stack my_stack2;
>  stack *ptr_to_stack1;
>  stack *ptr_to_stack2;
>
>  ptr_to_stack1 = &my_stack1;
>  ptr_to_stack2 = &my_stack2;
>
>
>  int finished = 0;
>  cout << "\nAssembly Compiler Program\n";
>  while (!quit)
>  {
>   test = file_to_stack(ptr_to_stack1, ptr_to_stack2);//stack 2 is
corrected
>   test = order_stack(ptr_to_stack1, ptr_to_stack2); file://stack 1 is
> corrected
>   test = out_to_file(ptr_to_stack1, ptr_to_stack2); file://use stack 1
>
>
>  cout << endl;
>  cout << endl;
>  my_stack1.st_clear();
>  cout << "All Done? 1=YES 0=NO \n";
>  cin >> quit;
>  }
> }
>
>
> file://here is one of the recieving functions
> int file_to_stack(stack *my_stack1, stack *my_stack2)
> {
>  char c;
>  char c1;
>  int count2=0;
>  int count3=0;
>  int pass_fail = 0;
>  FILE *stream;
>  int numread;
>  char item;
>  char element[MAX];
>  char temp_element[MAX];
>  char temp_element2[MAX];
>  char filename_in[80];
>  int count = 0;
>  int count1 = 0;
>
>  init_array(NULL, element, MAX);
>  init_array(NULL, temp_element, MAX);
>  init_array(NULL, temp_element2, MAX);
>
>  cout << "What is the name of the file you want to open?";
>  cout << endl;
>  cin >> filename_in;
>  stream=fopen(filename_in, "rb");// open for read binary
>
>
>
>  do /*create a stack of arrays of equations*/
>  {
>   numread = fread(&item, sizeof(char),1,stream);
>   if ((isalnum(item)) || (ispunct(item)) && (isprint(item)))
>   {
>    element[count] = item;
>    ++count;
>   if ((item==';') && (isprint(item)) && (item>0))
>   {
>    strcpy(temp_element,element);
>
>    for (count2=0; count2<count; count2++)
>    {
>     c = element[count2];
>     c1 = element[count2+1];
>     temp_element[count3]=c;
>     temp_element2[0]=c1;
>     ++count3;
>
>     if (check_op(c1))
>     {
>      my_stack1.st_put( temp_element );
>      my_stack1.st_put( temp_element2 );
>      init_array(NULL, temp_element, MAX);
>      init_array(NULL, temp_element2, MAX);
>      count3 = 0;
>      count2++;
>     }
>    }
>    cout << element;
>    cout << "\n";
>    init_array(NULL, element, MAX);
>    count = 0;
>    item = NULL;
>   }
>   }
>  } while (numread>0);
>
>  cout << endl;
>  my_stack1.st_dump();
>  fclose(stream);
>
>
>
>
>
> return pass_fail;
> }
>
> I get this sort of error "left of .st_put requires class/struct/union
type"
> I understand
>
> that I have only the pointer to the stack in the function but I cannot
seem
> to dereferance
>
> the pointer. I would appreciate any help.
>
> Regards,
>
>
> New C++ Programmer
>
>