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[SVN r7621]

include/boost/integer.hpp

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+//  boost integer.hpp header file  -------------------------------------------//
+
+//  (C) Copyright Beman Dawes 1999. Permission to copy, use, modify, sell
+//  and distribute this software is granted provided this copyright
+//  notice appears in all copies. This software is provided "as is" without
+//  express or implied warranty, and with no claim as to its suitability for
+//  any purpose.
+
+//  See http://www.boost.org for most recent version including documentation.
+
+//  Revision History
+//   28 Aug 99  Initial version
+
+#ifndef BOOST_INTEGER_HPP
+#define BOOST_INTEGER_HPP
+
+#include <limits>
+
+namespace boost
+{
+
+  //  Helper templates  ------------------------------------------------------//
+
+  //  fast integers from least integers
+  template< typename LeastInt >
+  struct int_fast_t { typedef LeastInt fast; }; // imps may specialize
+
+  //  convert category to type 
+  template< int Category > struct int_least_helper {}; // default is empty
+
+  //  specializatons: 1=long, 2=int, 3=short, 4=signed char,
+  //     6=unsigned long, 7=unsigned int, 8=unsigned short, 9=unsigned long
+  template<> struct int_least_helper<1> { typedef long least; };
+  template<> struct int_least_helper<2> { typedef int least; };
+  template<> struct int_least_helper<3> { typedef short least; };
+  template<> struct int_least_helper<4> { typedef signed char least; };
+  template<> struct int_least_helper<6> { typedef unsigned long least; };
+  template<> struct int_least_helper<7> { typedef unsigned int least; };
+  template<> struct int_least_helper<8> { typedef unsigned short least; };
+  template<> struct int_least_helper<9> { typedef unsigned char least; };
+
+  //  integer templates specifying number of bits  ---------------------------//
+
+  //  signed
+  template< int Bits >   // bits (including sign) required
+  struct int_t 
+  {
+      typedef int_least_helper
+        <
+          (Bits-1 <= std::numeric_limits<long>::digits) +
+          (Bits-1 <= std::numeric_limits<int>::digits) +
+          (Bits-1 <= std::numeric_limits<short>::digits) +
+          (Bits-1 <= std::numeric_limits<signed char>::digits)
+        >::least  least;
+      typedef int_fast_t<least>::fast  fast;
+  };
+
+  //  unsigned
+  template< int Bits >   // bits required
+  struct uint_t 
+  {
+      typedef int_least_helper
+        < 
+          5 +
+          (Bits <= std::numeric_limits<unsigned long>::digits) +
+          (Bits <= std::numeric_limits<unsigned int>::digits) +
+          (Bits <= std::numeric_limits<unsigned short>::digits) +
+          (Bits <= std::numeric_limits<unsigned char>::digits)
+        >::least  least;
+      typedef int_fast_t<least>::fast  fast;
+  };
+
+//  The same dispatching technique can be used to select types based on
+//  values.  That will be added once boost::integer_traits is available.
+
+
+} // namespace boost
+
+#endif  // BOOST_INTEGER_HPP