MESSAGE
| DATE | 2011-07-07 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [NYLXS - HANGOUT] (fwd) Re: array initiation - methodology for converting C code to C++
|
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From: Michael DOUBEZ
Newsgroups: comp.lang.c++
Subject: Re: array initiation - methodology for converting C code to C++
Date: Wed, 6 Jul 2011 02:56:57 -0700 (PDT)
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Xref: panix comp.lang.c++:1087318
On Jul 6, 5:12=A0am, Ruben Safir wrote:
> I had some C style code that essentially had
>
> const char * choices[] =3D {"Choice A", "Choice B", "Choice C", "Choice D=
"};
>
> Now this is obviously a problem in a class framework as it can not be
> initialized in the class definition.
No but it can be afterward:
class menu_window
{
static char const * const choices[];
};
char const * const menu_window::choices[] =3D {"Choice A", "Choice B",
"Choice C", "Choice D"};
> So I tried some variations so I didn't have to alter the internal code
> that used the array. =A0Someone told me to make it a static array, but
> something happened which I didn't expect. =A0I tried
>
> screens.h
>
> =A0class menu_window
> =A0 {
> =A0 =A0 public:
>
> =A0 =A0 =A0 /* =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D =A0LIFECYCLE =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D */
> =A0 =A0 =A0 menu_window (); =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 /* constructor =A0 =A0 =A0*/
> =A0 =A0 =A0 menu_window (int height, int width, int row, int col);
> =A0 =A0 =A0 menu_window ( const menu_window &other ); =A0 /* copy constru=
ctor */
> =A0 =A0 =A0 ~menu_window (); =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0/* destructor =A0 =A0 =A0 */
>
> =A0 =A0 =A0 WINDOW *menu_win;
> =A0 =A0 =A0 static char const *choices[5];
> =A0 =A0 =A0 int height;
> =A0 =A0 =A0 int width;
> ....
>
> }
>
> screens.cpp
>
> Screens::menu_window::menu_window (int pheight, int pwidth, int prow, int=
pcol): height(pheight), width(pwidth), highlight(1), choice(0) , n_choices=
(sizeof(choices)/ sizeof(choices[0])) {
> =A0 =A0row_(prow);
> =A0 =A0col_(pcol);
> =A0 =A0choices[0] =3D "Add a question ";
> =A0 =A0choices[1] =3D "Start the Quiz ";
> =A0 =A0choices[2] =3D "c ";
> =A0 =A0choices[3] =3D "d ";
> =A0 =A0choices[4] =3D "Exit ";
> =A0 =A0menu_win =3D newwin(height, width, row_(), col_() );
> =A0 =A0keypad(menu_win, TRUE);
> =A0 =A0mvprintw(0,0, "Use arrow keys to go up and down, Press enter to se=
lect choice");
> =A0 =A0refresh();
> =A0 =A0print_menu(menu_win, highlight);
>
> } =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0/* construct=
or =A0 =A0 =A0*/
>
> and this failed as a static. =A0When I removed static, it works fine. =A0=
Why?
Did it fail at link time ? If so, it is because you have declared it
but not defined it.
--
Michael
-- end of forwarded message --
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