1 

     2 #ifndef BOOST_MPL_AUX_LARGEST_INT_HPP_INCLUDED

     3 #define BOOST_MPL_AUX_LARGEST_INT_HPP_INCLUDED

     4 

     5 // Copyright Aleksey Gurtovoy 2000-2004

     6 //

     7 // Distributed under the Boost Software License, Version 1.0. 

     8 // (See accompanying file LICENSE_1_0.txt or copy at 

     9 // http://www.boost.org/LICENSE_1_0.txt)

    10 //

    11 // See http://www.boost.org/libs/mpl for documentation.

    12 

    13 // $Source: /cvsroot/boost/boost/boost/mpl/aux_/largest_int.hpp,v $

    14 // $Date: 2004/09/19 03:08:53 $

    15 // $Revision: 1.5 $

    16 

    17 #include <boost/mpl/if.hpp>

    18 #include <boost/mpl/int.hpp>

    19 #include <boost/mpl/aux_/config/integral.hpp>

    20 #include <boost/config.hpp>

    21 

    22 namespace boost { namespace mpl { namespace aux {

    23 

    24 template< typename T > struct integral_rank;

    25 

    26 template<> struct integral_rank<bool>           : int_<1> {};

    27 template<> struct integral_rank<signed char>    : int_<2> {};

    28 template<> struct integral_rank<char>           : int_<3> {};

    29 template<> struct integral_rank<unsigned char>  : int_<4> {};

    30 #if !defined(BOOST_NO_INTRINSIC_WCHAR_T)

    31 template<> struct integral_rank<wchar_t>        : int_<5> {};

    32 #endif

    33 template<> struct integral_rank<short>          : int_<6> {};

    34 template<> struct integral_rank<unsigned short> : int_<7> {};

    35 template<> struct integral_rank<int>            : int_<8> {};

    36 template<> struct integral_rank<unsigned int>   : int_<9> {};

    37 template<> struct integral_rank<long>           : int_<10> {};

    38 template<> struct integral_rank<unsigned long>  : int_<11> {};

    39 

    40 #if defined(BOOST_HAS_LONG_LONG)

    41 template<> struct integral_rank<long_long_type> : int_<12> {};

    42 template<> struct integral_rank<ulong_long_type>: int_<13> {};

    43 #endif

    44 

    45 template< typename T1, typename T2 > struct largest_int

    46 #if !defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC)

    47     : if_c< 

    48           ( integral_rank<T1>::value >= integral_rank<T2>::value )

    49         , T1

    50         , T2

    51         >

    52 {

    53 #else

    54 {

    55     enum { rank1 = integral_rank<T1>::value };

    56     enum { rank2 = integral_rank<T2>::value };

    57     typedef typename if_c< (rank1 >= rank2),T1,T2 >::type type;

    58 #endif

    59 };

    60 

    61 }}}

    62 

    63 #endif // BOOST_MPL_AUX_LARGEST_INT_HPP_INCLUDED