1 2Being a *template* metaprogramming framework, the MPL concentrates on 3getting one thing done well and leaves most of the clearly 4preprocessor-related tasks to the corresponding specialized 5libraries [PRE]_, [Ve03]_. But whether we like it or not, macros play 6an important role on today's C++ metaprogramming, and some of 7the useful MPL-level functionality cannot be implemented 8without leaking its preprocessor-dependent implementation 9nature into the library's public interface. 10 11 12.. [PRE] Vesa Karvonen, Paul Mensonides, 13 `The Boost Preprocessor Metaprogramming library`__ 14 15__ http://www.boost.org/libs/preprocessor/doc/index.html 16 17.. [Ve03] Vesa Karvonen, `The Order Programming Language`, 2003. 18 19 20.. copyright:: Copyright � 2001-2009 Aleksey Gurtovoy and David Abrahams 21 Distributed under the Boost Software License, Version 1.0. (See accompanying 22 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 23