Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: /// \file vector.hpp
Chris@16: ///
Chris@16: //  Copyright 2005 Eric Niebler. Distributed under the Boost
Chris@16: //  Software License, Version 1.0. (See accompanying file
Chris@16: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_NUMERIC_FUNCTIONAL_VECTOR_HPP_EAN_12_12_2005
Chris@16: #define BOOST_NUMERIC_FUNCTIONAL_VECTOR_HPP_EAN_12_12_2005
Chris@16: 
Chris@16: #ifdef BOOST_NUMERIC_FUNCTIONAL_HPP_INCLUDED
Chris@16: # error Include this file before boost/accumulators/numeric/functional.hpp
Chris@16: #endif
Chris@16: 
Chris@16: #include <vector>
Chris@16: #include <functional>
Chris@16: #include <boost/assert.hpp>
Chris@16: #include <boost/mpl/and.hpp>
Chris@16: #include <boost/mpl/not.hpp>
Chris@16: #include <boost/utility/enable_if.hpp>
Chris@16: #include <boost/type_traits/is_same.hpp>
Chris@16: #include <boost/type_traits/is_scalar.hpp>
Chris@16: #include <boost/type_traits/remove_const.hpp>
Chris@16: #include <boost/typeof/std/vector.hpp>
Chris@16: #include <boost/accumulators/numeric/functional_fwd.hpp>
Chris@16: 
Chris@16: namespace boost { namespace numeric
Chris@16: {
Chris@16:     namespace operators
Chris@16:     {
Chris@16:         namespace acc_detail
Chris@16:         {
Chris@16:             template<typename Fun>
Chris@16:             struct make_vector
Chris@16:             {
Chris@16:                 typedef std::vector<typename Fun::result_type> type;
Chris@16:             };
Chris@16:         }
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // Handle vector<Left> / Right where Right is a scalar.
Chris@16:         template<typename Left, typename Right>
Chris@16:         typename lazy_enable_if<
Chris@16:             is_scalar<Right>
Chris@16:           , acc_detail::make_vector<functional::divides<Left, Right> >
Chris@16:         >::type
Chris@16:         operator /(std::vector<Left> const &left, Right const &right)
Chris@16:         {
Chris@16:             typedef typename functional::divides<Left, Right>::result_type value_type;
Chris@16:             std::vector<value_type> result(left.size());
Chris@16:             for(std::size_t i = 0, size = result.size(); i != size; ++i)
Chris@16:             {
Chris@16:                 result[i] = numeric::divides(left[i], right);
Chris@16:             }
Chris@16:             return result;
Chris@16:         }
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // Handle vector<Left> / vector<Right>.
Chris@16:         template<typename Left, typename Right>
Chris@16:         std::vector<typename functional::divides<Left, Right>::result_type>
Chris@16:         operator /(std::vector<Left> const &left, std::vector<Right> const &right)
Chris@16:         {
Chris@16:             typedef typename functional::divides<Left, Right>::result_type value_type;
Chris@16:             std::vector<value_type> result(left.size());
Chris@16:             for(std::size_t i = 0, size = result.size(); i != size; ++i)
Chris@16:             {
Chris@16:                 result[i] = numeric::divides(left[i], right[i]);
Chris@16:             }
Chris@16:             return result;
Chris@16:         }
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // Handle vector<Left> * Right where Right is a scalar.
Chris@16:         template<typename Left, typename Right>
Chris@16:         typename lazy_enable_if<
Chris@16:             is_scalar<Right>
Chris@16:           , acc_detail::make_vector<functional::multiplies<Left, Right> >
Chris@16:         >::type
Chris@16:         operator *(std::vector<Left> const &left, Right const &right)
Chris@16:         {
Chris@16:             typedef typename functional::multiplies<Left, Right>::result_type value_type;
Chris@16:             std::vector<value_type> result(left.size());
Chris@16:             for(std::size_t i = 0, size = result.size(); i != size; ++i)
Chris@16:             {
Chris@16:                 result[i] = numeric::multiplies(left[i], right);
Chris@16:             }
Chris@16:             return result;
Chris@16:         }
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // Handle Left * vector<Right> where Left is a scalar.
Chris@16:         template<typename Left, typename Right>
Chris@16:         typename lazy_enable_if<
Chris@16:             is_scalar<Left>
Chris@16:           , acc_detail::make_vector<functional::multiplies<Left, Right> >
Chris@16:         >::type
Chris@16:         operator *(Left const &left, std::vector<Right> const &right)
Chris@16:         {
Chris@16:             typedef typename functional::multiplies<Left, Right>::result_type value_type;
Chris@16:             std::vector<value_type> result(right.size());
Chris@16:             for(std::size_t i = 0, size = result.size(); i != size; ++i)
Chris@16:             {
Chris@16:                 result[i] = numeric::multiplies(left, right[i]);
Chris@16:             }
Chris@16:             return result;
Chris@16:         }
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // Handle vector<Left> * vector<Right>
Chris@16:         template<typename Left, typename Right>
Chris@16:         std::vector<typename functional::multiplies<Left, Right>::result_type>
Chris@16:         operator *(std::vector<Left> const &left, std::vector<Right> const &right)
Chris@16:         {
Chris@16:             typedef typename functional::multiplies<Left, Right>::result_type value_type;
Chris@16:             std::vector<value_type> result(left.size());
Chris@16:             for(std::size_t i = 0, size = result.size(); i != size; ++i)
Chris@16:             {
Chris@16:                 result[i] = numeric::multiplies(left[i], right[i]);
Chris@16:             }
Chris@16:             return result;
Chris@16:         }
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // Handle vector<Left> + vector<Right>
Chris@16:         template<typename Left, typename Right>
Chris@16:         std::vector<typename functional::plus<Left, Right>::result_type>
Chris@16:         operator +(std::vector<Left> const &left, std::vector<Right> const &right)
Chris@16:         {
Chris@16:             typedef typename functional::plus<Left, Right>::result_type value_type;
Chris@16:             std::vector<value_type> result(left.size());
Chris@16:             for(std::size_t i = 0, size = result.size(); i != size; ++i)
Chris@16:             {
Chris@16:                 result[i] = numeric::plus(left[i], right[i]);
Chris@16:             }
Chris@16:             return result;
Chris@16:         }
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // Handle vector<Left> - vector<Right>
Chris@16:         template<typename Left, typename Right>
Chris@16:         std::vector<typename functional::minus<Left, Right>::result_type>
Chris@16:         operator -(std::vector<Left> const &left, std::vector<Right> const &right)
Chris@16:         {
Chris@16:             typedef typename functional::minus<Left, Right>::result_type value_type;
Chris@16:             std::vector<value_type> result(left.size());
Chris@16:             for(std::size_t i = 0, size = result.size(); i != size; ++i)
Chris@16:             {
Chris@16:                 result[i] = numeric::minus(left[i], right[i]);
Chris@16:             }
Chris@16:             return result;
Chris@16:         }
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // Handle vector<Left> += vector<Left>
Chris@16:         template<typename Left>
Chris@16:         std::vector<Left> &
Chris@16:         operator +=(std::vector<Left> &left, std::vector<Left> const &right)
Chris@16:         {
Chris@16:             BOOST_ASSERT(left.size() == right.size());
Chris@16:             for(std::size_t i = 0, size = left.size(); i != size; ++i)
Chris@16:             {
Chris@16:                 numeric::plus_assign(left[i], right[i]);
Chris@16:             }
Chris@16:             return left;
Chris@16:         }
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // Handle -vector<Arg>
Chris@16:         template<typename Arg>
Chris@16:         std::vector<typename functional::unary_minus<Arg>::result_type>
Chris@16:         operator -(std::vector<Arg> const &arg)
Chris@16:         {
Chris@16:             typedef typename functional::unary_minus<Arg>::result_type value_type;
Chris@16:             std::vector<value_type> result(arg.size());
Chris@16:             for(std::size_t i = 0, size = result.size(); i != size; ++i)
Chris@16:             {
Chris@16:                 result[i] = numeric::unary_minus(arg[i]);
Chris@16:             }
Chris@16:             return result;
Chris@16:         }
Chris@16:     }
Chris@16: 
Chris@16:     namespace functional
Chris@16:     {
Chris@16:         struct std_vector_tag;
Chris@16: 
Chris@16:         template<typename T, typename Al>
Chris@16:         struct tag<std::vector<T, Al> >
Chris@16:         {
Chris@16:             typedef std_vector_tag type;
Chris@16:         };
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // element-wise min of std::vector
Chris@16:         template<typename Left, typename Right>
Chris@16:         struct min_assign<Left, Right, std_vector_tag, std_vector_tag>
Chris@16:           : std::binary_function<Left, Right, void>
Chris@16:         {
Chris@16:             void operator ()(Left &left, Right &right) const
Chris@16:             {
Chris@16:                 BOOST_ASSERT(left.size() == right.size());
Chris@16:                 for(std::size_t i = 0, size = left.size(); i != size; ++i)
Chris@16:                 {
Chris@16:                     if(numeric::less(right[i], left[i]))
Chris@16:                     {
Chris@16:                         left[i] = right[i];
Chris@16:                     }
Chris@16:                 }
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // element-wise max of std::vector
Chris@16:         template<typename Left, typename Right>
Chris@16:         struct max_assign<Left, Right, std_vector_tag, std_vector_tag>
Chris@16:           : std::binary_function<Left, Right, void>
Chris@16:         {
Chris@16:             void operator ()(Left &left, Right &right) const
Chris@16:             {
Chris@16:                 BOOST_ASSERT(left.size() == right.size());
Chris@16:                 for(std::size_t i = 0, size = left.size(); i != size; ++i)
Chris@16:                 {
Chris@16:                     if(numeric::greater(right[i], left[i]))
Chris@16:                     {
Chris@16:                         left[i] = right[i];
Chris@16:                     }
Chris@16:                 }
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         // partial specialization for std::vector.
Chris@16:         template<typename Left, typename Right>
Chris@16:         struct fdiv<Left, Right, std_vector_tag, void>
Chris@16:           : mpl::if_<
Chris@16:                 are_integral<typename Left::value_type, Right>
Chris@16:               , divides<Left, double const>
Chris@16:               , divides<Left, Right>
Chris@16:             >::type
Chris@16:         {};
Chris@16: 
Chris@16:         // promote
Chris@16:         template<typename To, typename From>
Chris@16:         struct promote<To, From, std_vector_tag, std_vector_tag>
Chris@16:           : std::unary_function<From, To>
Chris@16:         {
Chris@16:             To operator ()(From &arr) const
Chris@16:             {
Chris@16:                 typename remove_const<To>::type res(arr.size());
Chris@16:                 for(std::size_t i = 0, size = arr.size(); i != size; ++i)
Chris@16:                 {
Chris@16:                     res[i] = numeric::promote<typename To::value_type>(arr[i]);
Chris@16:                 }
Chris@16:                 return res;
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         template<typename ToFrom>
Chris@16:         struct promote<ToFrom, ToFrom, std_vector_tag, std_vector_tag>
Chris@16:           : std::unary_function<ToFrom, ToFrom>
Chris@16:         {
Chris@16:             ToFrom &operator ()(ToFrom &tofrom) const
Chris@16:             {
Chris@16:                 return tofrom;
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // functional::as_min
Chris@16:         template<typename T>
Chris@16:         struct as_min<T, std_vector_tag>
Chris@16:           : std::unary_function<T, typename remove_const<T>::type>
Chris@16:         {
Chris@16:             typename remove_const<T>::type operator ()(T &arr) const
Chris@16:             {
Chris@16:                 return 0 == arr.size()
Chris@16:                   ? T()
Chris@16:                   : T(arr.size(), numeric::as_min(arr[0]));
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // functional::as_max
Chris@16:         template<typename T>
Chris@16:         struct as_max<T, std_vector_tag>
Chris@16:           : std::unary_function<T, typename remove_const<T>::type>
Chris@16:         {
Chris@16:             typename remove_const<T>::type operator ()(T &arr) const
Chris@16:             {
Chris@16:                 return 0 == arr.size()
Chris@16:                   ? T()
Chris@16:                   : T(arr.size(), numeric::as_max(arr[0]));
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // functional::as_zero
Chris@16:         template<typename T>
Chris@16:         struct as_zero<T, std_vector_tag>
Chris@16:           : std::unary_function<T, typename remove_const<T>::type>
Chris@16:         {
Chris@16:             typename remove_const<T>::type operator ()(T &arr) const
Chris@16:             {
Chris@16:                 return 0 == arr.size()
Chris@16:                   ? T()
Chris@16:                   : T(arr.size(), numeric::as_zero(arr[0]));
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////////////
Chris@16:         // functional::as_one
Chris@16:         template<typename T>
Chris@16:         struct as_one<T, std_vector_tag>
Chris@16:           : std::unary_function<T, typename remove_const<T>::type>
Chris@16:         {
Chris@16:             typename remove_const<T>::type operator ()(T &arr) const
Chris@16:             {
Chris@16:                 return 0 == arr.size()
Chris@16:                   ? T()
Chris@16:                   : T(arr.size(), numeric::as_one(arr[0]));
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:     } // namespace functional
Chris@16: 
Chris@16: }} // namespace boost::numeric
Chris@16: 
Chris@16: #endif
Chris@16: