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//-----------------------------------------------------------------------------
// boost variant/recursive_wrapper.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2002-2003
// Eric Friedman, Itay Maman
//
// 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_VARIANT_RECURSIVE_WRAPPER_HPP
#define BOOST_VARIANT_RECURSIVE_WRAPPER_HPP
#include "boost/variant/recursive_wrapper_fwd.hpp"
#include "boost/checked_delete.hpp"
namespace boost {
//////////////////////////////////////////////////////////////////////////
// class template recursive_wrapper
//
// See docs and recursive_wrapper_fwd.hpp for more information.
//
template <typename T>
class recursive_wrapper
{
public: // typedefs
typedef T type;
private: // representation
T* p_;
public: // structors
~recursive_wrapper();
recursive_wrapper();
recursive_wrapper(const recursive_wrapper& operand);
recursive_wrapper(const T& operand);
private: // helpers, for modifiers (below)
void assign(const T& rhs);
public: // modifiers
recursive_wrapper& operator=(const recursive_wrapper& rhs)
{
assign( rhs.get() );
return *this;
}
recursive_wrapper& operator=(const T& rhs)
{
assign( rhs );
return *this;
}
void swap(recursive_wrapper& operand)
{
T* temp = operand.p_;
operand.p_ = p_;
p_ = temp;
}
public: // queries
T& get() { return *get_pointer(); }
const T& get() const { return *get_pointer(); }
T* get_pointer() { return p_; }
const T* get_pointer() const { return p_; }
};
template <typename T>
recursive_wrapper<T>::~recursive_wrapper()
{
boost::checked_delete(p_);
}
template <typename T>
recursive_wrapper<T>::recursive_wrapper()
: p_(new T)
{
}
template <typename T>
recursive_wrapper<T>::recursive_wrapper(const recursive_wrapper& operand)
: p_(new T( operand.get() ))
{
}
template <typename T>
recursive_wrapper<T>::recursive_wrapper(const T& operand)
: p_(new T(operand))
{
}
template <typename T>
void recursive_wrapper<T>::assign(const T& rhs)
{
this->get() = rhs;
}
// function template swap
//
// Swaps two recursive_wrapper<T> objects of the same type T.
//
template <typename T>
inline void swap(recursive_wrapper<T>& lhs, recursive_wrapper<T>& rhs)
{
lhs.swap(rhs);
}
} // namespace boost
#endif // BOOST_VARIANT_RECURSIVE_WRAPPER_HPP
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