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Added MPL-compatible variant of the processor-optimized integer template

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[SVN r47452]
This commit is contained in:
Daryle Walker
2008-07-15 18:56:59 +00:00
parent 55e1796c7a
commit f27ad7b337
4 changed files with 66 additions and 32 deletions
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25
include/boost/integer.hpp
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@ -7,7 +7,8 @@
// See http://www.boost.org/libs/integer for documentation.
// Revision History
// 15 Jul 08 Added exact-integer templates. (Daryle Walker)
// 15 Jul 08 Added exact-integer templates; added MPL-compatible variant of
// processor-optimized integer template. (Daryle Walker)
// 14 Jul 08 Added extended-integer support. (Daryle Walker)
// 13 Jul 08 Redid implmentation. (Daryle Walker)
// 22 Sep 01 Added value-based integer templates. (Daryle Walker)
@ -20,10 +21,11 @@
#include <boost/integer_fwd.hpp> // self include
#include <boost/config.hpp> // for BOOST_STATIC_CONSTANT, etc.
#include <boost/cstdint.hpp> // for boost::uintmax_t, intmax_t
#include <boost/integer_traits.hpp> // for boost::integer_traits
#include <boost/limits.hpp> // for std::numeric_limits
#include <boost/config.hpp> // for BOOST_STATIC_CONSTANT, etc.
#include <boost/cstdint.hpp> // for boost::uintmax_t, intmax_t
#include <boost/integer_traits.hpp> // for boost::integer_traits
#include <boost/limits.hpp> // for std::numeric_limits
#include <boost/utility/enable_if.hpp> // for boost::enable_if_c
#include <climits> // for UCHAR_MAX, USHRT_MAX, UINT_MAX, ULONG_MAX, etc.
@ -32,10 +34,21 @@ namespace boost
// integer template mapping a type to its processor-optimized analog -----//
// Some types can be handled better by the processor than others. This
// template metafunction should map various built-in integral types to
// the processor's perferred type for the given type's value range
template < typename BaseInt >
struct fast_integral
{
typedef BaseInt type;
};
// Platform-specific specializations should go here.
// 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
struct int_fast_t { typedef typename fast_integral<LeastInt>::type fast; };
namespace detail
{

3
include/boost/integer_fwd.hpp
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@ -84,6 +84,9 @@ template < >
// From <boost/integer.hpp> ------------------------------------------------//
template < typename BaseInt >
struct fast_integral;
template < typename LeastInt >
struct int_fast_t;