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Copy pathfunction_equal.hpp
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161 lines (140 loc) · 4.83 KB
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/*==============================================================================
Copyright (c) 2005-2010 Joel de Guzman
Copyright (c) 2010 Thomas Heller
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_CORE_FUNCTION_EQUAL_HPP
#define BOOST_PHOENIX_CORE_FUNCTION_EQUAL_HPP
#include <boost/phoenix/core/limits.hpp>
#include <boost/is_placeholder.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/phoenix/core/terminal.hpp>
#include <boost/proto/matches.hpp>
#ifndef BOOST_PHOENIX_NO_VARIADIC_FUNCTION_EQUAL
# include <boost/phoenix/core/detail/index_sequence.hpp>
#endif
namespace boost
{
template <typename> class weak_ptr;
}
namespace boost { namespace phoenix
{
template <typename>
struct actor;
namespace detail
{
struct compare
: proto::callable
{
typedef bool result_type;
template <typename A0, typename A1>
result_type operator()(A0 const & a0, A1 const & a1) const
{
return a0 == a1;
}
// hard wiring reference_wrapper and weak_ptr here ...
// **TODO** find out why boost bind does this ...
template <typename A0, typename A1>
result_type
operator()(
reference_wrapper<A0> const & a0
, reference_wrapper<A1> const & a1
) const
{
return a0.get_pointer() == a1.get_pointer();
}
template <typename A0, typename A1>
result_type
operator()(weak_ptr<A0> const & a0, weak_ptr<A1> const & a1) const
{
return !(a0 < a1) && !(a1 < a0);
}
};
struct function_equal_otherwise;
struct function_equal_
: proto::when<
proto::if_<
proto::matches<proto::_, proto::_state>()
, proto::or_<
proto::when<
proto::terminal<proto::_>
, compare(
proto::_value
, proto::call<
proto::_value(proto::_state)
>
)
>
, proto::otherwise<function_equal_otherwise(proto::_, proto::_state)>
>
, proto::call<function_equal_otherwise()>
>
>
{};
struct function_equal_otherwise
: proto::callable
{
typedef bool result_type;
result_type operator()() const
{
return false;
}
#ifdef BOOST_PHOENIX_NO_VARIADIC_FUNCTION_EQUAL
template <typename Expr1>
result_type operator()(Expr1 const& e1, Expr1 const& e2) const
{
return
this->evaluate(
e1
, e2
, typename proto::arity_of<Expr1>::type()
);
}
private:
#include <boost/phoenix/core/detail/cpp03/function_equal.hpp>
#else
template <typename Expr1>
result_type operator()(Expr1 const& e1, Expr1 const& e2) const
{
return
this->evaluate(
e1
, e2
, typename make_index_sequence<proto::arity_of<Expr1>::value>::type()
);
}
private:
template <typename Expr1>
result_type
evaluate(Expr1 const& /*e1*/, Expr1 const& /*e2*/, index_sequence<>) const
{
return true;
}
template <typename Expr1, std::size_t Head, std::size_t... Tail>
result_type
evaluate(Expr1 const& e1, Expr1 const& e2, index_sequence<Head, Tail...>) const
{
return
function_equal_()(proto::child_c<Head>(e1), proto::child_c<Head>(e2)) &&
this->evaluate(
e1
, e2
, index_sequence<Tail...>()
);
}
#endif
};
}
template <typename Expr1, typename Expr2>
inline bool function_equal_impl(actor<Expr1> const& a1, actor<Expr2> const& a2)
{
return detail::function_equal_()(a1, a2);
}
template <typename Expr1, typename Expr2>
inline bool function_equal(actor<Expr1> const& a1, actor<Expr2> const& a2)
{
return function_equal_impl(a1, a2);
}
}}
#endif