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signed_unsigned_tools.hpp - Hosted on DriveHQ Cloud IT Platform
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Ruta de la carpeta: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\random\detail\signed_unsigned_tools.hpp
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/* boost random/detail/signed_unsigned_tools.hpp header file * * Copyright Jens Maurer 2006 * 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 for most recent version including documentation. */ #ifndef BOOST_RANDOM_DETAIL_SIGNED_UNSIGNED_TOOLS #define BOOST_RANDOM_DETAIL_SIGNED_UNSIGNED_TOOLS #include
#include
namespace boost { namespace random { namespace detail { /* * Given an (integral) type T, returns the type "unsigned T". * (type_traits appears to be lacking the feature) */ template
struct make_unsigned { }; template<> struct make_unsigned
{ typedef unsigned char type; }; template<> struct make_unsigned
{ typedef unsigned char type; }; template<> struct make_unsigned
{ typedef unsigned char type; }; template<> struct make_unsigned
{ typedef unsigned short type; }; template<> struct make_unsigned
{ typedef unsigned short type; }; template<> struct make_unsigned
{ typedef unsigned int type; }; template<> struct make_unsigned
{ typedef unsigned int type; }; template<> struct make_unsigned
{ typedef unsigned long type; }; template<> struct make_unsigned
{ typedef unsigned long type; }; #ifdef BOOST_HAS_LONG_LONG template<> struct make_unsigned
{ typedef unsigned long long type; }; template<> struct make_unsigned
{ typedef unsigned long long type; }; #endif /* * Compute x - y, we know that x >= y, return an unsigned value. */ template
::is_signed> struct subtract { }; template
struct subtract
{ typedef T result_type; result_type operator()(T x, T y) { return x - y; } }; template
struct subtract
{ typedef typename make_unsigned
::type result_type; result_type operator()(T x, T y) { if (y >= 0) // because x >= y, it follows that x >= 0, too return result_type(x) - result_type(y); if (x >= 0) // y < 0 // avoid the nasty two's complement case for y == min() return result_type(x) + result_type(-(y+1)) + 1; // both x and y are negative: no signed overflow return result_type(x - y); } }; /* * Compute x + y, x is unsigned, result fits in type of "y". */ template
::is_signed> struct add { }; template
struct add
{ typedef T2 result_type; result_type operator()(T1 x, T2 y) { return x + y; } }; template
struct add
{ typedef T2 result_type; result_type operator()(T1 x, T2 y) { if (y >= 0) return x + y; // y < 0 if (x >= T1(-(y+1))) // result >= 0 after subtraction // avoid the nasty two's complement edge case for y == min() return T2(x - T1(-(y+1)) - 1); // abs(x) < abs(y), thus T2 able to represent x return T2(x) + y; } }; } // namespace detail } // namespace random } // namespace boost #endif // BOOST_RANDOM_DETAIL_SIGNED_UNSIGNED_TOOLS
signed_unsigned_tools.hpp
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