SelectSaver - save and restore selected file handle

- NAME
- SYNOPSIS
- DESCRIPTION

# NAME

SelectSaver - save and restore selected file handle

# SYNOPSIS

        use SelectSaver;

        {
           my $saver = new SelectSaver(FILEHANDLE);
           # FILEHANDLE is selected
        }
        # previous handle is selected

        {
           my $saver = new SelectSaver;
           # new handle may be selected, or not
        }
        # previous handle is selected

# DESCRIPTION

A SelectSaver object contains a reference to the file handle that was selected when it was created. If its new method gets an extra parameter, then that parameter is selected; otherwise, the selected file handle remains unchanged.

When a SelectSaver is destroyed, it re-selects the file handle that was selected when it was created.