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: =?UTF-8?B?5LicIOiLjw==?=
Newsgroups: comp.lang.c++
Subject: Re: array initiation - methodology for converting C code to C++
Date: Wed, 6 Jul 2011 01:10:55 -0700 (PDT)
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On 7=E6=9C=886=E6=97=A5, =E4=B8=8A=E5=8D=8811=E6=97=B612=E5=88=86, Ruben Sa=
fir 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.
>
> So I tried some variations so I didn't have to alter the internal code
> that used the array. =C2=A0Someone told me to make it a static array, but
> something happened which I didn't expect. =C2=A0I tried
>
> screens.h
>
> =C2=A0class menu_window
> =C2=A0 {
> =C2=A0 =C2=A0 public:
>
> =C2=A0 =C2=A0 =C2=A0 /* =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D =C2=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 */
> =C2=A0 =C2=A0 =C2=A0 menu_window (); =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 /* construct=
or =C2=A0 =C2=A0 =C2=A0*/
> =C2=A0 =C2=A0 =C2=A0 menu_window (int height, int width, int row, int col=
);
> =C2=A0 =C2=A0 =C2=A0 menu_window ( const menu_window &other ); =C2=A0 /* =
copy constructor */
> =C2=A0 =C2=A0 =C2=A0 ~menu_window (); =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0/* destructor=
=C2=A0 =C2=A0 =C2=A0 */
>
> =C2=A0 =C2=A0 =C2=A0 WINDOW *menu_win;
> =C2=A0 =C2=A0 =C2=A0 static char const *choices[5];
> =C2=A0 =C2=A0 =C2=A0 int height;
> =C2=A0 =C2=A0 =C2=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])) {
> =C2=A0 =C2=A0row_(prow);
> =C2=A0 =C2=A0col_(pcol);
> =C2=A0 =C2=A0choices[0] =3D "Add a question ";
> =C2=A0 =C2=A0choices[1] =3D "Start the Quiz ";
> =C2=A0 =C2=A0choices[2] =3D "c ";
> =C2=A0 =C2=A0choices[3] =3D "d ";
> =C2=A0 =C2=A0choices[4] =3D "Exit ";
> =C2=A0 =C2=A0menu_win =3D newwin(height, width, row_(), col_() );
> =C2=A0 =C2=A0keypad(menu_win, TRUE);
> =C2=A0 =C2=A0mvprintw(0,0, "Use arrow keys to go up and down, Press enter=
to select choice");
> =C2=A0 =C2=A0refresh();
> =C2=A0 =C2=A0print_menu(menu_win, highlight);
>
> } =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0/* constructor =C2=A0 =C2=A0 =C2=A0*/
>
> and this failed as a static. =C2=A0When I removed static, it works fine. =
=C2=A0Why?
static memeber variable should like this Screens::choices[0] =3D "Add a
question ";
-- end of forwarded message --
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