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Ruta de la carpeta: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\math\tools\promotion.hpp
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// boost\math\tools\promotion.hpp // Copyright John Maddock 2006. // Copyright Paul A. Bristow 2006. // Use, modification and distribution are subject to 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) // Promote arguments functions to allow math functions to have arguments // provided as integer OR real (floating-point, built-in or UDT) // (called ArithmeticType in functions that use promotion) // that help to reduce the risk of creating multiple instantiations. // Allows creation of an inline wrapper that forwards to a foo(RT, RT) function, // so you never get to instantiate any mixed foo(RT, IT) functions. #ifndef BOOST_MATH_PROMOTION_HPP #define BOOST_MATH_PROMOTION_HPP // Boost type traits: #include
#include
// for boost::is_floating_point; #include
// for boost::is_integral #include
// for boost::is_convertible #include
// for boost::is_same #include
// for boost::remove_cv // Boost Template meta programming: #include
// for boost::mpl::if_c. #include
// for boost::mpl::if_c. #include
// for boost::mpl::if_c. #ifdef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS #include
#endif namespace boost { namespace math { namespace tools { // If either T1 or T2 is an integer type, // pretend it was a double (for the purposes of further analysis). // Then pick the wider of the two floating-point types // as the actual signature to forward to. // For example: // foo(int, short) -> double foo(double, double); // foo(int, float) -> double foo(double, double); // Note: NOT float foo(float, float) // foo(int, double) -> foo(double, double); // foo(double, float) -> double foo(double, double); // foo(double, float) -> double foo(double, double); // foo(any-int-or-float-type, long double) -> foo(long double, long double); // but ONLY float foo(float, float) is unchanged. // So the only way to get an entirely float version is to call foo(1.F, 2.F), // But since most (all?) the math functions convert to double internally, // probably there would not be the hoped-for gain by using float here. // This follows the C-compatible conversion rules of pow, etc // where pow(int, float) is converted to pow(double, double). template
struct promote_arg { // If T is integral type, then promote to double. typedef typename mpl::if_
, double, T>::type type; }; template
struct promote_args_2 { // Promote, if necessary, & pick the wider of the two floating-point types. // for both parameter types, if integral promote to double. typedef typename promote_arg
::type T1P; // T1 perhaps promoted. typedef typename promote_arg
::type T2P; // T2 perhaps promoted. typedef typename mpl::if_< typename mpl::and_
, is_floating_point
>::type, // both T1P and T2P are floating-point? typename mpl::if_< typename mpl::or_
, is_same
>::type, // either long double? long double, // then result type is long double. typename mpl::if_< typename mpl::or_
, is_same
>::type, // either double? double, // result type is double. float // else result type is float. >::type >::type, // else one or the other is a user-defined type: typename mpl::if_< ::boost::is_convertible
, T2P, T1P>::type>::type type; }; // promote_arg2 template
struct promote_args { typedef typename promote_args_2< typename remove_cv
::type, typename promote_args_2< typename remove_cv
::type, typename promote_args_2< typename remove_cv
::type, typename promote_args_2< typename remove_cv
::type, typename promote_args_2< typename remove_cv
::type, typename remove_cv
::type >::type >::type >::type >::type >::type type; #ifdef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS // // Guard against use of long double if it's not supported: // BOOST_STATIC_ASSERT((0 == ::boost::is_same
::value)); #endif }; } // namespace tools } // namespace math } // namespace boost #endif // BOOST_MATH_PROMOTION_HPP
promotion.hpp
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