traits.hpp

boost库提供标准的C++ API 配合dev c++使用,功能更加强大

//
//  Copyright (c) 2000-2002
//  Joerg Walter, Mathias Koch
//
//  Permission to use, copy, modify, distribute and sell this software
//  and its documentation for any purpose is hereby granted without fee,
//  provided that the above copyright notice appear in all copies and
//  that both that copyright notice and this permission notice appear
//  in supporting documentation.  The authors make no representations
//  about the suitability of this software for any purpose.
//  It is provided "as is" without express or implied warranty.
//
//  The authors gratefully acknowledge the support of
//  GeNeSys mbH & Co. KG in producing this work.
//

#ifndef BOOST_UBLAS_TRAITS_H
#define BOOST_UBLAS_TRAITS_H

#include <algorithm>
#include <cmath>
#include <complex>

#include <boost/numeric/ublas/config.hpp>

// Promote traits borrowed from Todd Veldhuizen

namespace boost { namespace numeric { namespace ublas {

    template<class T>
    struct type_traits {
        typedef type_traits<T> self_type;
        typedef T value_type;
        typedef const T &const_reference;
        typedef T &reference;
        typedef T real_type;
        typedef T precision_type;

        BOOST_STATIC_CONSTANT (std::size_t, plus_complexity = 0);
        BOOST_STATIC_CONSTANT (std::size_t, multiplies_complexity = 0);

        static
        BOOST_UBLAS_INLINE
        real_type real (const_reference) {
            external_logic ().raise ();
            return 0;
        }
        static
        BOOST_UBLAS_INLINE
        real_type imag (const_reference) {
            external_logic ().raise ();
            return 0;
        }
        static
        BOOST_UBLAS_INLINE
        value_type conj (const_reference) {
            external_logic ().raise ();
            return 0;
        }

        static
        BOOST_UBLAS_INLINE
        real_type abs (const_reference) {
            external_logic ().raise ();
            return 0;
        }
        static
        BOOST_UBLAS_INLINE
        value_type sqrt (const_reference) {
            external_logic ().raise ();
            return 0;
        }

        static
        BOOST_UBLAS_INLINE
        real_type norm_1 (const_reference t) {
            // Oops, should have known that!
            return type_traits<real_type>::abs (self_type::real (t)) +
                   type_traits<real_type>::abs (self_type::imag (t));
        }
        static
        BOOST_UBLAS_INLINE
        real_type norm_2 (const_reference t) {
            return self_type::abs (t);
        }
        static
        BOOST_UBLAS_INLINE
        real_type norm_inf (const_reference t) {
            // Oops, should have known that!
            return std::max (type_traits<real_type>::abs (self_type::real (t)),
                             type_traits<real_type>::abs (self_type::imag (t)));
        }

        static
        BOOST_UBLAS_INLINE
        bool equals (const_reference t1, const_reference t2) {
            return self_type::norm_inf (t1 - t2) < BOOST_UBLAS_TYPE_CHECK_EPSILON *
                   std::max (std::max (self_type::norm_inf (t1),
                                       self_type::norm_inf (t2)),
                             BOOST_UBLAS_TYPE_CHECK_MIN);
        }
    };

    template<>
    struct type_traits<float> {
        typedef type_traits<float> self_type;
        typedef float value_type;
#ifndef BOOST_UBLAS_CONST_REFERENCE_AS_VALUE
        typedef const float &const_reference;
#else
        typedef float const_reference;
#endif
        typedef float &reference;
        typedef float real_type;
        typedef double precision_type;

        BOOST_STATIC_CONSTANT (std::size_t, plus_complexity = 1);
        BOOST_STATIC_CONSTANT (std::size_t, multiplies_complexity = 1);

        static
        BOOST_UBLAS_INLINE
        real_type real (const_reference t) {
                return t;
        }
        static
        BOOST_UBLAS_INLINE
        real_type imag (const_reference t) {
                return 0;
        }
        static
        BOOST_UBLAS_INLINE
        value_type conj (const_reference t) {
                return t;
        }

        static
        BOOST_UBLAS_INLINE
        real_type abs (const_reference t) {
#if defined (BOOST_NO_STDC_NAMESPACE) || defined (BOOST_UBLAS_NO_CMATH)
            return ::fabsf (t);
#else
            return std::abs (t);
#endif
        }
        static
        BOOST_UBLAS_INLINE
        value_type sqrt (const_reference t) {
#if defined (BOOST_NO_STDC_NAMESPACE) || defined (BOOST_UBLAS_NO_CMATH)
            return ::sqrtf (t);
#else
            return std::sqrt (t);
#endif
        }

        static
        BOOST_UBLAS_INLINE
        real_type norm_1 (const_reference t) {
            return self_type::abs (t);
        }
        static
        BOOST_UBLAS_INLINE
        real_type norm_2 (const_reference t) {
            return self_type::abs (t);
        }
        static
        BOOST_UBLAS_INLINE
        real_type norm_inf (const_reference t) {
            return self_type::abs (t);
        }

        static
        BOOST_UBLAS_INLINE
        bool equals (const_reference t1, const_reference t2) {
            return self_type::norm_inf (t1 - t2) < BOOST_UBLAS_TYPE_CHECK_EPSILON *
                   std::max (std::max (self_type::norm_inf (t1),
                                       self_type::norm_inf (t2)),
                             BOOST_UBLAS_TYPE_CHECK_MIN);
        }
    };
    template<>
    struct type_traits<double> {
        typedef type_traits<double> self_type;
        typedef double value_type;
#ifndef BOOST_UBLAS_CONST_REFERENCE_AS_VALUE
        typedef const double &const_reference;
#else
        typedef double const_reference;
#endif
        typedef double &reference;
        typedef double real_type;
#ifndef BOOST_UBLAS_USE_LONG_DOUBLE
        typedef double precision_type;
#else
        typedef long double precision_type;
#endif

        BOOST_STATIC_CONSTANT (std::size_t, plus_complexity = 1);
        BOOST_STATIC_CONSTANT (std::size_t, multiplies_complexity = 1);

        static
        BOOST_UBLAS_INLINE
        real_type real (const_reference t) {
                return t;
        }
        static
        BOOST_UBLAS_INLINE
        real_type imag (const_reference t) {
                return 0;
        }
        static
        BOOST_UBLAS_INLINE
        value_type conj (const_reference t) {
                return t;
        }

        static
        BOOST_UBLAS_INLINE
        real_type abs (const_reference t) {
#if defined (BOOST_NO_STDC_NAMESPACE) || defined (BOOST_UBLAS_NO_CMATH)
            return ::fabs (t);
#else
            return std::abs (t);
#endif
        }
        static
        BOOST_UBLAS_INLINE
        value_type sqrt (const_reference t) {
#if defined (BOOST_NO_STDC_NAMESPACE) || defined (BOOST_UBLAS_NO_CMATH)
            return ::sqrt (t);
#else
            return std::sqrt (t);
#endif
        }

        static
        BOOST_UBLAS_INLINE
        real_type norm_1 (const_reference t) {
            return self_type::abs (t);
        }
        static
        BOOST_UBLAS_INLINE
        real_type norm_2 (const_reference t) {
            return self_type::abs (t);
        }
        static
        BOOST_UBLAS_INLINE
        real_type norm_inf (const_reference t) {
            return self_type::abs (t);
        }

        static
        BOOST_UBLAS_INLINE
        bool equals (const_reference t1, const_reference t2) {
            return self_type::norm_inf (t1 - t2) < BOOST_UBLAS_TYPE_CHECK_EPSILON *
                   std::max (std::max (self_type::norm_inf (t1),
                                       self_type::norm_inf (t2)),
                             BOOST_UBLAS_TYPE_CHECK_MIN);
        }
    };
#ifdef BOOST_UBLAS_USE_LONG_DOUBLE
    template<>
    struct type_traits<long double> {
        typedef type_traits<long double> self_type;
        typedef long double value_type;
#ifndef BOOST_UBLAS_CONST_REFERENCE_AS_VALUE
        typedef const long double &const_reference;
#else
        typedef long double const_reference;
#endif
        typedef long double &reference;
        typedef long double real_type;
        typedef long double precision_type;

        BOOST_STATIC_CONSTANT (std::size_t, plus_complexity = 1);
        BOOST_STATIC_CONSTANT (std::size_t, multiplies_complexity = 1);

        static
        BOOST_UBLAS_INLINE
        real_type real (const_reference t) {
                return t;
        }
        static
        BOOST_UBLAS_INLINE
        real_type imag (const_reference t) {
                return 0;
        }
        static
        BOOST_UBLAS_INLINE
        value_type conj (const_reference t) {
                return t;
        }

        static
        BOOST_UBLAS_INLINE
        real_type abs (const_reference t) {
#if defined (BOOST_NO_STDC_NAMESPACE) || defined (BOOST_UBLAS_NO_CMATH)
            return ::fabsl (t);
#else
            return std::abs (t);
#endif
        }
        static
        BOOST_UBLAS_INLINE
        value_type sqrt (const_reference t) {
#if defined (BOOST_NO_STDC_NAMESPACE) || defined (BOOST_UBLAS_NO_CMATH)
            return ::sqrtl (t);
#else
            return std::sqrt (t);
#endif
        }

        static
        BOOST_UBLAS_INLINE
        real_type norm_1 (const_reference t) {
            return self_type::abs (t);
        }
        static
        BOOST_UBLAS_INLINE
        real_type norm_2 (const_reference t) {
            return self_type::abs (t);
        }
        static
        BOOST_UBLAS_INLINE
        real_type norm_inf (const_reference t) {
            return self_type::abs (t);
        }

        static
        BOOST_UBLAS_INLINE
        bool equals (const_reference t1, const_reference t2) {
            return self_type::norm_inf (t1 - t2) < BOOST_UBLAS_TYPE_CHECK_EPSILON *
                   std::max (std::max (self_type::norm_inf (t1),
                                       self_type::norm_inf (t2)),
                             BOOST_UBLAS_TYPE_CHECK_MIN);
        }
    };
#endif

    template<>
    struct type_traits<std::complex<float> > {
        typedef type_traits<std::complex<float> > self_type;
        typedef std::complex<float> value_type;
        typedef const std::complex<float> &const_reference;
        typedef std::complex<float> &reference;
        typedef float real_type;
        typedef std::complex<double> precision_type;

        BOOST_STATIC_CONSTANT (std::size_t, plus_complexity = 2);
        BOOST_STATIC_CONSTANT (std::size_t, multiplies_complexity = 6);

        static
        BOOST_UBLAS_INLINE
        real_type real (const_reference t) {
                // return t.real ();
                return std::real (t);
        }
        static
        BOOST_UBLAS_INLINE
        real_type imag (const_reference t) {
                // return t.imag ();
                return std::imag (t);
        }
        static
        BOOST_UBLAS_INLINE
        value_type conj (const_reference t) {
                // return t.conj ();
                return std::conj (t);
        }

        static
        BOOST_UBLAS_INLINE
        real_type abs (const_reference t) {
                return std::abs (t);
        }
        static
        BOOST_UBLAS_INLINE
        value_type sqrt (const_reference t) {