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 // $Id$
14 // $Date$
15 // $Revision$
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
64