////////////////////////////////////////////////////////////////////////////
// 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;
template <typename This, typename A0, typename A1>
struct result<This(A0,A1)>
{
typedef bool type;
};
template <typename A0, typename A1>
bool operator()(A0 const & a0, A1 const & a1) const
{
return a0 == a1;
}
};
struct XNot_equal
{
template <typename Sig>
struct result;
template <typename This, typename A0, typename A1>
struct result<This(A0,A1)>
{
typedef bool type;
};
template <typename A0, typename A1>
bool operator()(A0 const & a0, A1 const & a1) const
{
return a0 != a1;
}
};
struct XGreater
{
template <typename Sig>
struct result;
template <typename This, typename A0, typename A1>
struct result<This(A0,A1)>
{
typedef bool type;
};
template <typename A0, typename A1>
bool operator()(A0 const & a0, A1 const & a1) const
{
return a0 > a1;
}
};
struct XLess
{
template <typename Sig>
struct result;
template <typename This, typename A0, typename A1>
struct result<This(A0,A1)>
{
typedef bool type;
};
template <typename A0, typename A1>
bool operator()(A0 const & a0, A1 const & a1) const
{
return a0 < a1;
}
};
struct XGreater_equal
{
template <typename Sig>
struct result;
template <typename This, typename A0, typename A1>
struct result<This(A0,A1)>
{
typedef bool type;
};
template <typename A0, typename A1>
bool operator()(A0 const & a0, A1 const & a1) const
{
return a0 >= a1;
}
};
struct XLess_equal
{
template <typename Sig>
struct result;
template <typename This, typename A0, typename A1>
struct result<This(A0,A1)>
{
typedef bool type;
};
template <typename A0, typename A1>
bool operator()(A0 const & a0, A1 const & a1) const
{
return a0 <= a1;
}
};
struct XPositive
{
template <typename Sig>
struct result;
template <typename This, typename A0>
struct result<This(A0)>
{
typedef bool type;
};
template <typename A0>
bool operator()(A0 const & a0) const
{
return a0 >= A0(0);
}
};
struct XLogical_and
{
template <typename Sig>
struct result;
template <typename This, typename A0, typename A1>
struct result<This(A0,A1)>
{
typedef bool type;
};
template <typename A0, typename A1>
bool operator()(A0 const & a0, A1 const & a1) const
{
return a0 && a1;
}
};
struct XLogical_or
{
template <typename Sig>
struct result;
template <typename This, typename A0, typename A1>
struct result<This(A0,A1)>
{
typedef bool type;
};
template <typename A0, typename A1>
bool operator()(A0 const & a0, A1 const & a1) const
{
return a0 || a1;
}
};
struct XLogical_not
{
template <typename Sig>
struct result;
template <typename This, typename A0>
struct result<This(A0)>
{
typedef bool type;
};
template <typename A0>
bool operator()(A0 const & a0) const
{
return !a0;
}
};
struct XMin
{
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
{
if ( a0 < a1 ) return a0; else return a1;
}
};
struct XMax
{
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
{
if ( a0 < a1 ) return a1; else return a0;
}
};
struct XInc
{
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 + 1;
}
};
struct XDec
{
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 - 1;
}
};
struct XSin
{
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 std::sin(a0);
}
};
// Example of templated struct.
// How do I make it callable?
template <typename Result>
struct what {
typedef Result result_type;
Result operator()(Result const & r) const
{
return r;
}
// what is not complete - error.
//static boost::function1<Result,Result> res = what<Result>();
};
template <typename Result>
struct what0 {
typedef Result result_type;
Result operator()() const
{
return Result(100);
}
};
template <class Result, class F>
class MonomorphicWrapper0 /* : public c_fun_type<Res> */
{
F f;
public:
typedef Result result_type;
MonomorphicWrapper0( const F& g ) : f(g) {}
Result operator()() const {
return f();
}
};
}
/////////////////////////////////////////////////////////
// Look at this. How to use Phoenix with a templated
// struct. First adapt with boost::function and then
// convert that to Phoenix!!
// I have not found out how to do it directly.
/////////////////////////////////////////////////////////
boost::function1<int, int > what_int = impl::what<int>();
typedef boost::function1<int,int> fun1_int_int;
typedef boost::function0<int> fun0_int;
boost::function0<int> what0_int = impl::what0<int>();
BOOST_PHOENIX_ADAPT_FUNCTION(int,what,what_int,1)
BOOST_PHOENIX_ADAPT_FUNCTION_NULLARY(int,what0,what0_int)
// And this shows how to make them into argument callable functions.
typedef boost::phoenix::function<fun1_int_int> What_arg;
typedef boost::phoenix::function<fun0_int> What0_arg;
What_arg what_arg(what_int);
What0_arg what0_arg(what0_int);
// To use these as arguments they have to be defined like this.
typedef boost::phoenix::function<impl::XPlus> Plus;
typedef boost::phoenix::function<impl::XMinus> Minus;
typedef boost::phoenix::function<impl::XMultiplies> Multiplies;
typedef boost::phoenix::function<impl::XDivides> Divides;
typedef boost::phoenix::function<impl::XModulus> Modulus;
typedef boost::phoenix::function<impl::XNegate> Negate;
typedef boost::phoenix::function<impl::XEqual> Equal;
typedef boost::phoenix::function<impl::XNot_equal> Not_equal;
typedef boost::phoenix::function<impl::XGreater> Greater;
typedef boost::phoenix::function<impl::XLess> Less;
typedef boost::phoenix::function<impl::XGreater_equal> Greater_equal;
typedef boost::phoenix::function<impl::XLess_equal> Less_equal;
typedef boost::phoenix::function<impl::XPositive> Positive;
typedef boost::phoenix::function<impl::XLogical_and> Logical_and;
typedef boost::phoenix::function<impl::XLogical_or> Logical_or;
typedef boost::phoenix::function<impl::XLogical_not> Logical_not;
typedef boost::phoenix::function<impl::XMax> Max;
typedef boost::phoenix::function<impl::XMin> Min;
typedef boost::phoenix::function<impl::XInc> Inc;
typedef boost::phoenix::function<impl::XDec> Dec;
typedef boost::phoenix::function<impl::XSin> Sin;
Plus plus;
Minus minus;
Multiplies multiplies;
Divides divides;
Modulus modulus;
Negate negate;
Equal equal;
Not_equal not_equal;
Greater greater;
Less less;
Greater_equal greater_equal;
Less_equal less_equal;
Positive positive;
Logical_and logical_and;
Logical_or logical_or;
Logical_not logical_not;
Max max;
Min min;
Inc inc;
Dec dec;
Sin sin;
}
}
#endif