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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
#ifdef _MSC_VER
#pragma once
#endif
// Boost type traits:
#include <boost/math/tools/config.hpp>
#include <boost/type_traits/is_floating_point.hpp> // for boost::is_floating_point;
#include <boost/type_traits/is_integral.hpp> // for boost::is_integral
#include <boost/type_traits/is_convertible.hpp> // for boost::is_convertible
#include <boost/type_traits/is_same.hpp>// for boost::is_same
#include <boost/type_traits/remove_cv.hpp>// for boost::remove_cv
// Boost Template meta programming:
#include <boost/mpl/if.hpp> // for boost::mpl::if_c.
#include <boost/mpl/and.hpp> // for boost::mpl::if_c.
#include <boost/mpl/or.hpp> // for boost::mpl::if_c.
#include <boost/mpl/not.hpp> // for boost::mpl::if_c.
#ifdef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
#include <boost/static_assert.hpp>
#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 <class T>
struct promote_arg
{ // If T is integral type, then promote to double.
typedef typename mpl::if_<is_integral<T>, double, T>::type type;
};
// These full specialisations reduce mpl::if_ usage and speed up
// compilation:
template <> struct promote_arg<float> { typedef float type; };
template <> struct promote_arg<double>{ typedef double type; };
template <> struct promote_arg<long double> { typedef long double type; };
template <> struct promote_arg<int> { typedef double type; };
template <class T1, class T2>
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<T1>::type T1P; // T1 perhaps promoted.
typedef typename promote_arg<T2>::type T2P; // T2 perhaps promoted.
typedef typename mpl::if_<
typename mpl::and_<is_floating_point<T1P>, is_floating_point<T2P> >::type, // both T1P and T2P are floating-point?
typename mpl::if_< typename mpl::or_<is_same<long double, T1P>, is_same<long double, T2P> >::type, // either long double?
long double, // then result type is long double.
typename mpl::if_< typename mpl::or_<is_same<double, T1P>, is_same<double, T2P> >::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_< typename mpl::and_<mpl::not_<is_floating_point<T2P> >, ::boost::is_convertible<T1P, T2P> >, T2P, T1P>::type>::type type;
}; // promote_arg2
// These full specialisations reduce mpl::if_ usage and speed up
// compilation:
template <> struct promote_args_2<float, float> { typedef float type; };
template <> struct promote_args_2<double, double>{ typedef double type; };
template <> struct promote_args_2<long double, long double> { typedef long double type; };
template <> struct promote_args_2<int, int> { typedef double type; };
template <> struct promote_args_2<int, float> { typedef double type; };
template <> struct promote_args_2<float, int> { typedef double type; };
template <> struct promote_args_2<int, double> { typedef double type; };
template <> struct promote_args_2<double, int> { typedef double type; };
template <> struct promote_args_2<int, long double> { typedef long double type; };
template <> struct promote_args_2<long double, int> { typedef long double type; };
template <> struct promote_args_2<float, double> { typedef double type; };
template <> struct promote_args_2<double, float> { typedef double type; };
template <> struct promote_args_2<float, long double> { typedef long double type; };
template <> struct promote_args_2<long double, float> { typedef long double type; };
template <> struct promote_args_2<double, long double> { typedef long double type; };
template <> struct promote_args_2<long double, double> { typedef long double type; };
template <class T1, class T2=float, class T3=float, class T4=float, class T5=float, class T6=float>
struct promote_args
{
typedef typename promote_args_2<
typename remove_cv<T1>::type,
typename promote_args_2<
typename remove_cv<T2>::type,
typename promote_args_2<
typename remove_cv<T3>::type,
typename promote_args_2<
typename remove_cv<T4>::type,
typename promote_args_2<
typename remove_cv<T5>::type, typename remove_cv<T6>::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<type, long double>::value));
#endif
};
} // namespace tools
} // namespace math
} // namespace boost
#endif // BOOST_MATH_PROMOTION_HPP
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