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Full Discussion: C++ program crashes
Top Forums Programming C++ program crashes Post 302608233 by Corona688 on Friday 16th of March 2012 02:00:04 PM
Old 03-16-2012
When you assign one class to the other, all you're copying is the pointer, not the memory itself. So they both end up holding pointers to the same memory.

When they go out of scope, they both try to free the same pointer. The first will succeed. The second to go out of scope will crash.

You should create a copy constructor for the class, which will be used whenever you assign another class to it with =.

Code:
class CString
{
...

CString(const CString& copy)
{
        m_data=new char[strlen(copy.m_data) + 1];
        strcpy(m_data, copy.m_data);
}

...

};

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scrl(3XCURSES)						  X/Open Curses Library Functions					    scrl(3XCURSES)

NAME
scrl, scroll, wscrl - scroll a window SYNOPSIS
cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib -R /usr/xpg4/lib -lcurses [ library... ] c89 [ flag... ] file... -lcurses [ library... ] #include <curses.h> int scrl(int n); int scroll(WINDOW *win); int wscrl(WINDOW *win, int n); PARAMETERS
n number and direction of lines to scroll win pointer to the window in which to scroll DESCRIPTION
The scroll() function scrolls the window win up one line. The current cursor position is not changed. The scrl() and wscrl() functions scroll the window stdscr or win up or down n lines, where n is a positive (scroll up) or negative (scroll down) integer. The scrollok(3XCURSES) function must be enabled for these functions to work. RETURN VALUES
On success, these functions return OK. Otherwise, they return ERR. ERRORS
None. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
clearok(3XCURSES), libcurses(3XCURSES), attributes(5), standards(5) SunOS 5.10 5 Jun 2002 scrl(3XCURSES)
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