As a special exception, you may use this file as part of a free software
library without restriction. Specifically, if other files instantiate
templates or use macros or inline functions from this file, or you compile
this file and link it with other files to produce an executable, this file
does not by itself cause the resulting executable to be covered by the
GNU General Public License. This exception does not however invalidate
any other reasons why the executable file might be covered by the GNU
General Public License.
