Imported existing code

libraries/include/boost/integer.hpp

@@ -0,0 +1,127 @@
+//  boost integer.hpp header file  -------------------------------------------//
+
+//  Copyright Beman Dawes and Daryle Walker 1999.  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/integer for documentation.
+
+//  Revision History
+//   22 Sep 01  Added value-based integer templates. (Daryle Walker)
+//   01 Apr 01  Modified to use new <boost/limits.hpp> header. (John Maddock)
+//   30 Jul 00  Add typename syntax fix (Jens Maurer)
+//   28 Aug 99  Initial version
+
+#ifndef BOOST_INTEGER_HPP
+#define BOOST_INTEGER_HPP
+
+#include <boost/integer_fwd.hpp>  // self include
+
+#include <boost/integer_traits.hpp>  // for boost::integer_traits
+#include <boost/limits.hpp>          // for std::numeric_limits
+
+namespace boost
+{
+
+  //  Helper templates  ------------------------------------------------------//
+
+  //  fast integers from least integers
+  //  int_fast_t<> works correctly for unsigned too, in spite of the name.
+  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 char
+  //  no specializations for 0 and 5: requests for a type > long are in error
+  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 typename 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 typename int_fast_t<least>::fast  fast;
+  };
+
+  //  unsigned
+  template< int Bits >   // bits required
+  struct uint_t 
+  {
+      typedef typename 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 typename int_fast_t<least>::fast  fast;
+      // int_fast_t<> works correctly for unsigned too, in spite of the name.
+  };
+
+  //  integer templates specifying extreme value  ----------------------------//
+
+  //  signed
+  template< long MaxValue >   // maximum value to require support
+  struct int_max_value_t 
+  {
+      typedef typename int_least_helper
+        <
+          (MaxValue <= integer_traits<long>::const_max) +
+          (MaxValue <= integer_traits<int>::const_max) +
+          (MaxValue <= integer_traits<short>::const_max) +
+          (MaxValue <= integer_traits<signed char>::const_max)
+        >::least  least;
+      typedef typename int_fast_t<least>::fast  fast;
+  };
+
+  template< long MinValue >   // minimum value to require support
+  struct int_min_value_t 
+  {
+      typedef typename int_least_helper
+        <
+          (MinValue >= integer_traits<long>::const_min) +
+          (MinValue >= integer_traits<int>::const_min) +
+          (MinValue >= integer_traits<short>::const_min) +
+          (MinValue >= integer_traits<signed char>::const_min)
+        >::least  least;
+      typedef typename int_fast_t<least>::fast  fast;
+  };
+
+  //  unsigned
+  template< unsigned long Value >   // maximum value to require support
+  struct uint_value_t 
+  {
+      typedef typename int_least_helper
+        < 
+          5 +
+          (Value <= integer_traits<unsigned long>::const_max) +
+          (Value <= integer_traits<unsigned int>::const_max) +
+          (Value <= integer_traits<unsigned short>::const_max) +
+          (Value <= integer_traits<unsigned char>::const_max)
+        >::least  least;
+      typedef typename int_fast_t<least>::fast  fast;
+  };
+
+
+} // namespace boost
+
+#endif  // BOOST_INTEGER_HPP