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Listing 1 Abridged version of window_update_scope

/* /////////////////////////////////////////////////////////////
 *
 * ...
 *
 * Extract from winstl_window_update_scope.h
 *
 * www:        http://www.synesis.com.au/winstl
 *             http://www.winstl.org/
 *
 * Copyright (C) 2002, Synesis Software Pty Ltd.
 * (Licensed under the Synesis Software Standard Source License:
 *  http://www.synesis.com.au/licenses/ssssl.html)
 *
 * ...
 *
 * ////////////////////////////////////////////////////////// */

...


namespace winstl
{

    class window_update_scope
    {
    // Construction
    public:
        // Takes a HWND and changes it's current update-status,
        // which is set back to the original state in the
        // destructor.
        ws_explicit_k window_update_scope(HWND hwnd)
            : m_bIsLocked(hwnd != NULL && ::LockWindowUpdate(hwnd))
        {}

        ~window_update_scope() winstl_throw_0()
        {
            if(m_bIsLocked)
            {
                // Lock was successful, so undo here
                ::LockWindowUpdate(NULL);
            }
        }

    // Members
    protected:
        ws_bool_t   m_bIsLocked;

    // Not to be implemented
    private:
        window_update_scope(window_update_scope const &rhs);
        window_update_scope const
            &operator =(window_update_scope const &rhs);
    };

} // namespace winstl