c++ post and pre increment operators - slightly off topic

[Gianni Mariani]

Please excuse my digression, it seems I have run out of other
references.

It seems c++ post increment methods don't happen post the expression.

A class that implements operator++() operator++(int) and operator*()
does not behave like (I at least) expected.

    int i = * pointer_val ++;

Seems to behave differently if pointer_val is a real pointer.  The post
increment operator happens BEFORE the reference.

Am I missing somthing.  Same thing happens on windoze.

------- output of the code below --------

perator++(int) called
operator*() called
operator++() called
operator*() called
x1=1 x2=1            <<< --
x1=0 x2=1            <<< -- expected these 2 lines to be the same.

------- the code below ----------


#include <iostream.h>

class foo {
public:
    int         i;

    foo( int x = 0 )
        : i( x )
    {
    }

    int operator*()
    {
        cout << "operator*() called\n";
        return i;
    }

    foo operator++()
    {
        cout << "operator++() called\n";
        ++ i;
        return * this;
    }

    foo operator++(int num)
    {
        cout << "operator++(int) called\n";
        i ++;
        return * this;
    }

};

int             intbar[] = { 0, 1, 2 };

main()
{

    foo foobar1;
    foo foobar2;


    int x1 = *foobar1++;
    int x2 = *++foobar2;

    cout << "x1=" << x1 << " x2=" << x2 << endl;

    int * intbar1 = intbar;
    int * intbar2 = intbar;

    x1 = *intbar1++;
    x2 = *++intbar2;

    cout << "x1=" << x1 << " x2=" << x2 << endl;

}


[gianni@uluru ds]$ ls
Debug/ ccstring.cpp  ccstring.h  jjnk.cpp*  jjnk.dsp* jjnk.ncb*
jjnk.plg*
[gianni@uluru ds]$ cat jjnk.cpp
#include <iostream.h>

class foo {
public:
    int         i;

    foo( int x = 0 )
        : i( x )
    {
    }

    int operator*()
    {
        cout << "operator*() called\n";
        return i;
    }

    foo operator++()
    {
        cout << "operator++() called\n";
        ++ i;
        return * this;
    }

    foo operator++(int num)
    {
        cout << "operator++(int) called\n";
        i ++;
        return * this;
    }

};

int             intbar[] = { 0, 1, 2 };

main()
{

    foo foobar1;
    foo foobar2;


    int x1 = *foobar1++;
    int x2 = *++foobar2;

    cout << "x1=" << x1 << " x2=" << x2 << endl;

    int * intbar1 = intbar;
    int * intbar2 = intbar;

    x1 = *intbar1++;
    x2 = *++intbar2;

    cout << "x1=" << x1 << " x2=" << x2 << endl;

}