整理

include/boost/mpl/aux_/largest_int.hpp

@@ -0,0 +1,63 @@
+
+#ifndef BOOST_MPL_AUX_LARGEST_INT_HPP_INCLUDED
+#define BOOST_MPL_AUX_LARGEST_INT_HPP_INCLUDED
+
+// 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.
+
+// $Id$
+// $Date$
+// $Revision$
+
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/int.hpp>
+#include <boost/mpl/aux_/config/integral.hpp>
+#include <boost/config.hpp>
+
+namespace boost { namespace mpl { namespace aux {
+
+template< typename T > struct integral_rank;
+
+template<> struct integral_rank<bool>           : int_<1> {};
+template<> struct integral_rank<signed char>    : int_<2> {};
+template<> struct integral_rank<char>           : int_<3> {};
+template<> struct integral_rank<unsigned char>  : int_<4> {};
+#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+template<> struct integral_rank<wchar_t>        : int_<5> {};
+#endif
+template<> struct integral_rank<short>          : int_<6> {};
+template<> struct integral_rank<unsigned short> : int_<7> {};
+template<> struct integral_rank<int>            : int_<8> {};
+template<> struct integral_rank<unsigned int>   : int_<9> {};
+template<> struct integral_rank<long>           : int_<10> {};
+template<> struct integral_rank<unsigned long>  : int_<11> {};
+
+#if defined(BOOST_HAS_LONG_LONG)
+template<> struct integral_rank<long_long_type> : int_<12> {};
+template<> struct integral_rank<ulong_long_type>: int_<13> {};
+#endif
+
+template< typename T1, typename T2 > struct largest_int
+#if !defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC)
+    : if_c< 
+          ( integral_rank<T1>::value >= integral_rank<T2>::value )
+        , T1
+        , T2
+        >
+{
+#else
+{
+    enum { rank1 = integral_rank<T1>::value };
+    enum { rank2 = integral_rank<T2>::value };
+    typedef typename if_c< (rank1 >= rank2),T1,T2 >::type type;
+#endif
+};
+
+}}}
+
+#endif // BOOST_MPL_AUX_LARGEST_INT_HPP_INCLUDED