msvc_dtw.hpp

C++的一个好库。。。现在很流行

// Copyright Aleksey Gurtovoy 2000-2004
//
// Distributed under the Boost Software License, Version 1.0. 
// (See accompanying file LICENSE_1_0.txt or copy at 
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/mpl for documentation.

// $Source: /cvsroot/boost/boost/boost/mpl/aux_/msvc_dtw.hpp,v $
// $Date: 2004/09/02 15:40:43 $
// $Revision: 1.4 $

// NO INCLUDE GUARDS, THE HEADER IS INTENDED FOR MULTIPLE INCLUSION!

#include <boost/mpl/aux_/preprocessor/params.hpp>

// local macros, #undef-ined at the end of the header
#define AUX778076_DTW_PARAMS(param) \
    BOOST_MPL_PP_PARAMS(AUX778076_MSVC_DTW_ARITY, param) \
/**/

#define AUX778076_DTW_ORIGINAL_NAME \
    AUX778076_MSVC_DTW_ORIGINAL_NAME \
/**/

// warning: not a well-formed C++
// workaround for MSVC 6.5's "dependent template typedef bug"

template< typename F>
struct AUX778076_MSVC_DTW_NAME
{
    template< bool > struct f_ : F {};
    template<> struct f_<true>
    {
#if AUX778076_MSVC_DTW_ARITY > 0
        template< AUX778076_DTW_PARAMS(typename P) > struct AUX778076_DTW_ORIGINAL_NAME
        {
            typedef int type;
        };
    };

    template< AUX778076_DTW_PARAMS(typename T) > struct result_
        : f_< aux::msvc_never_true<F>::value >
            ::template AUX778076_DTW_ORIGINAL_NAME< AUX778076_DTW_PARAMS(T) >
    {
    };
#else
        template< typename P = int > struct AUX778076_DTW_ORIGINAL_NAME
        {
            typedef int type;
        };
    };

    template< typename T = int > struct result_
        : f_< aux::msvc_never_true<F>::value >
            ::template AUX778076_DTW_ORIGINAL_NAME<>
    {
    };
#endif
};

#undef AUX778076_DTW_ORIGINAL_NAME
#undef AUX778076_DTW_PARAMS

#undef AUX778076_MSVC_DTW_NAME
#undef AUX778076_MSVC_DTW_ORIGINAL_NAME
#undef AUX778076_MSVC_DTW_ARITY