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
22namespace boost { namespace mpl { namespace aux {
23
24template< typename T > struct integral_rank;
25
26template<> struct integral_rank<bool> : int_<1> {};
27template<> struct integral_rank<signed char> : int_<2> {};
28template<> struct integral_rank<char> : int_<3> {};
29template<> struct integral_rank<unsigned char> : int_<4> {};
30#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
31template<> struct integral_rank<wchar_t> : int_<5> {};
32#endif
33template<> struct integral_rank<short> : int_<6> {};
34template<> struct integral_rank<unsigned short> : int_<7> {};
35template<> struct integral_rank<int> : int_<8> {};
36template<> struct integral_rank<unsigned int> : int_<9> {};
37template<> struct integral_rank<long> : int_<10> {};
38template<> struct integral_rank<unsigned long> : int_<11> {};
39
40#if defined(BOOST_HAS_LONG_LONG)
41template<> struct integral_rank<long_long_type> : int_<12> {};
42template<> struct integral_rank<ulong_long_type>: int_<13> {};
43#endif
44
45template< 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