| // 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 |