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Editing: lazy_operator.hpp

////////////////////////////////////////////////////////////////////////////
// lazy operator.hpp
//
// Build lazy operations for Phoenix equivalents for FC++
//
// These are equivalents of the Boost FC++ functoids in operator.hpp
//
// Implemented so far:
//
// make_pair
// plus minus multiplies divides modulus
// negate equal not_equal greater less
// greater_equal less_equal positive
// logical_and logical_or
// logical_not min max inc dec
//
// These are not from the FC++ operator.hpp but were made for testing purposes.
//
// identity (renamed id)
// sin
//
// These are now being modified to use boost::phoenix::function
// so that they are available for use as arguments.
// Types are being defined in capitals e.g. Id id;
////////////////////////////////////////////////////////////////////////////
/*=============================================================================
    Copyright (c) 2000-2003 Brian McNamara and Yannis Smaragdakis
    Copyright (c) 2001-2007 Joel de Guzman
    Copyright (c) 2015 John Fletcher

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)
==============================================================================*/

#ifndef BOOST_PHOENIX_FUNCTION_LAZY_OPERATOR
#define BOOST_PHOENIX_FUNCTION_LAZY_OPERATOR

#include <cmath>
#include <cstdlib>
#include <boost/phoenix/core.hpp>
#include <boost/phoenix/function.hpp>
#include <boost/function.hpp>

namespace boost {

namespace phoenix {

//////////////////////////////////////////////////////////////////////
// a_unique_type_for_nil
//////////////////////////////////////////////////////////////////////

// This may need to be moved elsewhere to define reuser.
   struct a_unique_type_for_nil {
     bool operator==( a_unique_type_for_nil ) const { return true; }
     bool operator< ( a_unique_type_for_nil ) const { return false; }
     typedef a_unique_type_for_nil value_type;
   };
    // This maybe put into a namespace.
   a_unique_type_for_nil NIL;

//////////////////////////////////////////////////////////////////////
// lazy_exception - renamed from fcpp_exception.
//////////////////////////////////////////////////////////////////////

#ifndef BOOST_PHOENIX_NO_LAZY_EXCEPTIONS
   struct lazy_exception : public std::exception {
       const char* s;
       lazy_exception( const char* ss ) : s(ss) {}
       const char* what() const throw() { return s; }
   };
#endif

//////////////////////////////////////////////////////////////////////

// in ref_count.hpp in BoostFC++
   typedef unsigned int RefCountType;

namespace impl {

// Implemented early, moved from lazy_signature.hpp
      template <class T>
      struct remove_RC
      {
          typedef typename boost::remove_reference<T>::type TT;
          typedef typename boost::remove_const<TT>::type type;
      };

struct XId
      {
        template <typename Sig>
        struct result;

template <typename This, typename A0>
        struct result<This(A0)>
           : boost::remove_reference<A0>
        {};

template <typename A0>
        A0 operator()(A0 const & a0) const
        {
            return a0;
        }

};

}

typedef boost::phoenix::function<impl::XId> Id;
    Id id;

#ifdef BOOST_RESULT_OF_USE_TR1
    // Experiment following examples in
    // phoenix/stl/container/container.hpp

namespace result_of {

template <
          typename Arg1
        , typename Arg2
      >
      class make_pair
      {
      public:
        typedef typename impl::remove_RC<Arg1>::type Arg1Type;
        typedef typename impl::remove_RC<Arg2>::type Arg2Type;
        typedef std::pair<Arg1Type,Arg2Type> type;
        typedef std::pair<Arg1Type,Arg2Type> result_type;
      };
    }
#endif

namespace impl
  {

struct XMake_pair {

#ifdef BOOST_RESULT_OF_USE_TR1
       template <typename Sig>
       struct result;
       // This fails with -O2 unless refs are removed from A1 and A2.
       template <typename This, typename A0, typename A1>
       struct result<This(A0, A1)>
       {
         typedef typename result_of::make_pair<A0,A1>::type type;
       };
#else
       template <typename Sig>
       struct result;

template <typename This, typename A0, typename A1>
       struct result<This(A0, A1)>
         : boost::remove_reference<std::pair<A0, A1> >
       {};
      
#endif

template <typename A0, typename A1>
#ifdef BOOST_RESULT_OF_USE_TR1
       typename result<XMake_pair(A0,A1)>::type
#else
       std::pair<A0, A1>
#endif
       operator()(A0 const & a0, A1 const & a1) const
       {
          return std::make_pair(a0,a1);
       }

};
  }

typedef boost::phoenix::function<impl::XMake_pair> Make_pair;
  Make_pair make_pair;

namespace impl
  {

// For now I will leave the return type deduction as it is.
    // I want to look at bringing in the sort of type deduction for
    // mixed types which I have in FC++.
    // Also I could look at the case where one of the arguments is
    // another functor or a Phoenix placeholder.
    struct XPlus
    {
        template <typename Sig>
        struct result;

template <typename This, typename A0, typename A1>
        struct result<This(A0, A1)>
             : boost::remove_reference<A0>
        {};

template <typename This, typename A0, typename A1, typename A2>
        struct result<This(A0, A1, A2)>
             : boost::remove_reference<A0>
        {};

template <typename A0, typename A1>
        A0 operator()(A0 const & a0, A1 const & a1) const
        {
          //A0 res = a0 + a1;
          //return res;
          return a0 + a1;
        }

template <typename A0, typename A1, typename A2>
        A0 operator()(A0 const & a0, A1 const & a1, A2 const & a2) const
        {
            return a0 + a1 + a2;
        }
    };

struct XMinus
    {
        template <typename Sig>
        struct result;

template <typename This, typename A0, typename A1>
        struct result<This(A0, A1)>
           : boost::remove_reference<A0>
        {};

template <typename A0, typename A1>
        A0 operator()(A0 const & a0, A1 const & a1) const
        {
            return a0 - a1;
        }

};

struct XMultiplies
    {
        template <typename Sig>
        struct result;

template <typename This, typename A0, typename A1>
        struct result<This(A0, A1)>
           : boost::remove_reference<A0>
        {};

template <typename A0, typename A1>
        A0 operator()(A0 const & a0, A1 const & a1) const
        {
            return a0 * a1;
        }

};

struct XDivides
    {
        template <typename Sig>
        struct result;

template <typename This, typename A0, typename A1>
        struct result<This(A0, A1)>
           : boost::remove_reference<A0>
        {};

template <typename A0, typename A1>
        A0 operator()(A0 const & a0, A1 const & a1) const
        {
            return a0 / a1;
        }

};

struct XModulus
    {
        template <typename Sig>
        struct result;

template <typename This, typename A0, typename A1>
        struct result<This(A0, A1)>
          : boost::remove_reference<A0>
        {};

template <typename A0, typename A1>
        A0 operator()(A0 const & a0, A1 const & a1) const
        {
            return a0 % a1;
        }

};

struct XNegate
    {
        template <typename Sig>
        struct result;

template <typename This, typename A0>
        struct result<This(A0)>
           : boost::remove_reference<A0>
        {};

template <typename A0>
        A0 operator()(A0 const & a0) const
        {
            return -a0;
        }
    };

struct XEqual
    {
        template <typename Sig>
        struct result;