Hi Walter,

I tried the latest beta compiler (8.41.2n) on the following program (which is the 'ArrayOperatorNew.cpp' example from 'Thinking in C++, 2ed' page 574. ================================================

// Operator new for arrays
#include <new> // Size_t definition
#include <fstream>
using namespace std;
ofstream trace("ArrayOperatorNew.out");

class Widget {
static const int sz = 10;
int i[sz];
public:
Widget() { trace << "*"; }
~Widget() { trace << "~"; }
void* operator new(size_t sz) {
trace << "Widget::new: " << sz << " bytes" << endl;
return ::new char[sz];
}
void operator delete(void* p) {
trace << "Widget::delete" << endl;
::delete []p;
}
void* operator new[](size_t sz) {
trace << "Widget::new[]: " << sz << " bytes" << endl;
return ::new char[sz];
}
void operator delete[](void* p) {
trace << "Widget:delete[]" << endl;
::delete []p;
}
};

int main() {
trace << "new Widget" << endl;
Widget* w = new Widget;
trace << "\ndelete Widget" << endl;
delete w;
trace << "\nnew Widget[25]" << endl;
Widget* wa = new Widget[25];
trace << "\ndelete []Widget" << endl;
delete []wa;
}

=======================================================

I compiled with 'dmc -Aa -ND -D_DLL ArrayOperatorNew.cpp'.  It compiles fine, but there's two issues I wanted to ask about:

1) The generated log file 'ArrayOperatorNew.out' should say:

new Widget
Widget::new: 40 bytes
*
delete Widget
~Widget::delete

new Widget[25]
Widget::new[]: 1004 bytes
*************************
delete []Widget
~~~~~~~~~~~~~~~~~~~~~~~~~Widget:delete[]


However, the call to Widget::new[] is never made, so the line 'Widget::new[]: 1004 bytes' is never printed.  It's as if operator new[] isn't implemented.  Is that true?

2) This compilation succeeds even if I DON'T use the '-Aa' option.  What exactly does '-Aa' do?

Thanks!

-Sean

-Aa is the default, and is always on.

"Sean wall" <Sean_member@pathlink.com> wrote in message news:c9l8us$2q4a$1@digitaldaemon.com...
> Hi Walter,
>
> I tried the latest beta compiler (8.41.2n) on the following program (which
is
> the 'ArrayOperatorNew.cpp' example from 'Thinking in C++, 2ed' page 574. ================================================
>
> // Operator new for arrays
> #include <new> // Size_t definition
> #include <fstream>
> using namespace std;
> ofstream trace("ArrayOperatorNew.out");
>
> class Widget {
> static const int sz = 10;
> int i[sz];
> public:
> Widget() { trace << "*"; }
> ~Widget() { trace << "~"; }
> void* operator new(size_t sz) {
> trace << "Widget::new: " << sz << " bytes" << endl;
> return ::new char[sz];
> }
> void operator delete(void* p) {
> trace << "Widget::delete" << endl;
> ::delete []p;
> }
> void* operator new[](size_t sz) {
> trace << "Widget::new[]: " << sz << " bytes" << endl;
> return ::new char[sz];
> }
> void operator delete[](void* p) {
> trace << "Widget:delete[]" << endl;
> ::delete []p;
> }
> };
>
> int main() {
> trace << "new Widget" << endl;
> Widget* w = new Widget;
> trace << "\ndelete Widget" << endl;
> delete w;
> trace << "\nnew Widget[25]" << endl;
> Widget* wa = new Widget[25];
> trace << "\ndelete []Widget" << endl;
> delete []wa;
> }
>
> =======================================================
>
> I compiled with 'dmc -Aa -ND -D_DLL ArrayOperatorNew.cpp'.  It compiles
fine,
> but there's two issues I wanted to ask about:
>
> 1) The generated log file 'ArrayOperatorNew.out' should say:
>
> new Widget
> Widget::new: 40 bytes
> *
> delete Widget
> ~Widget::delete
>
> new Widget[25]
> Widget::new[]: 1004 bytes
> *************************
> delete []Widget
> ~~~~~~~~~~~~~~~~~~~~~~~~~Widget:delete[]
>
>
> However, the call to Widget::new[] is never made, so the line
'Widget::new[]:
> 1004 bytes' is never printed.  It's as if operator new[] isn't
implemented.  Is
> that true?
>
> 2) This compilation succeeds even if I DON'T use the '-Aa' option.  What
exactly
> does '-Aa' do?
>
> Thanks!
>
> -Sean
>
>