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/*=============================================================================
Copyright (c) 2001-2014 Joel de Guzman
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)
==============================================================================*/
#if !defined(BOOST_SPIRIT_X3_VARIANT_AUGUST_6_2011_0859AM)
#define BOOST_SPIRIT_X3_VARIANT_AUGUST_6_2011_0859AM
#include <boost/variant.hpp>
#include <boost/mpl/list.hpp>
#include <boost/type_traits/is_base_of.hpp>
#include <type_traits>
///////////////////////////////////////////////////////////////////////////////
namespace boost { namespace spirit { namespace x3
{
template <typename T>
class forward_ast
{
public:
typedef T type;
public:
forward_ast() : p_(new T) {}
forward_ast(forward_ast const& operand)
: p_(new T(operand.get())) {}
forward_ast(forward_ast&& operand)
: p_(operand.p_)
{
operand.p_ = 0;
}
forward_ast(T const& operand)
: p_(new T(operand)) {}
forward_ast(T&& operand)
: p_(new T(std::move(operand))) {}
~forward_ast()
{
boost::checked_delete(p_);
}
forward_ast& operator=(forward_ast const& rhs)
{
assign(rhs.get());
return *this;
}
void swap(forward_ast& operand) BOOST_NOEXCEPT
{
T* temp = operand.p_;
operand.p_ = p_;
p_ = temp;
}
forward_ast& operator=(T const& rhs)
{
assign(rhs);
return *this;
}
forward_ast& operator=(forward_ast&& rhs) BOOST_NOEXCEPT
{
swap(rhs);
return *this;
}
forward_ast& operator=(T&& rhs)
{
get() = std::move(rhs);
return *this;
}
T& get() { return *get_pointer(); }
const T& get() const { return *get_pointer(); }
T* get_pointer() { return p_; }
const T* get_pointer() const { return p_; }
operator T const&() const { return this->get(); }
operator T&() { return this->get(); }
private:
void assign(const T& rhs)
{
this->get() = rhs;
}
T* p_;
};
// function template swap
//
// Swaps two forward_ast<T> objects of the same type T.
//
template <typename T>
inline void swap(forward_ast<T>& lhs, forward_ast<T>& rhs) BOOST_NOEXCEPT
{
lhs.swap(rhs);
}
namespace detail
{
template <typename T>
struct remove_forward : mpl::identity<T>
{};
template <typename T>
struct remove_forward<forward_ast<T>> : mpl::identity<T>
{};
}
template <typename ...Types>
struct variant
{
// tell spirit that this is an adapted variant
struct adapted_variant_tag;
using variant_type = boost::variant<Types...>;
using types = mpl::list<typename detail::remove_forward<Types>::type...>;
using base_type = variant; // The current instantiation
template<typename T>
using non_self_t // used only for SFINAE checks below
= std::enable_if_t<!(std::is_base_of<base_type
,std::remove_reference_t<T>
>
::value)
>;
variant() : var() {}
template <typename T, class = non_self_t<T>>
explicit variant(T const& rhs)
: var(rhs) {}
template <typename T, class = non_self_t<T>>
explicit variant(T&& rhs)
: var(std::forward<T>(rhs)) {}
variant(variant const& rhs)
: var(rhs.var) {}
variant(variant& rhs)
: var(rhs.var) {}
variant(variant&& rhs)
: var(std::forward<variant_type>(rhs.var)) {}
variant& operator=(variant const& rhs)
{
var = rhs.get();
return *this;
}
variant& operator=(variant&& rhs)
{
var = std::forward<variant_type>(rhs.get());
return *this;
}
template <typename T, class = non_self_t<T>>
variant& operator=(T const& rhs)
{
var = rhs;
return *this;
}
template <typename T, class = non_self_t<T>>
variant& operator=(T&& rhs)
{
var = std::forward<T>(rhs);
return *this;
}
template <typename F>
typename F::result_type apply_visitor(F const& v)
{
return var.apply_visitor(v);
}
template <typename F>
typename F::result_type apply_visitor(F const& v) const
{
return var.apply_visitor(v);
}
template <typename F>
typename F::result_type apply_visitor(F& v)
{
return var.apply_visitor(v);
}
template <typename F>
typename F::result_type apply_visitor(F& v) const
{
return var.apply_visitor(v);
}
variant_type const& get() const
{
return var;
}
variant_type& get()
{
return var;
}
variant_type var;
};
}}}
namespace boost
{
template <typename T, typename ...Types>
inline T const&
get(boost::spirit::x3::variant<Types...> const& x)
{
return boost::get<T>(x.get());
}
template <typename T, typename ...Types>
inline T&
get(boost::spirit::x3::variant<Types...>& x)
{
return boost::get<T>(x.get());
}
template <typename T, typename ...Types>
inline T const*
get(boost::spirit::x3::variant<Types...> const* x)
{
return boost::get<T>(&x->get());
}
template <typename T, typename ...Types>
inline T*
get(boost::spirit::x3::variant<Types...>* x)
{
return boost::get<T>(&x->get());
}
}
#endif
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