88 lines
2.3 KiB
Plaintext
88 lines
2.3 KiB
Plaintext
|
//-----------------------------------------------------------------------------
|
||
|
|
// boost variant/detail/enable_recursive_fwd.hpp header file
|
||
|
|
// See http://www.boost.org for updates, documentation, and revision history.
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
//
|
||
|
|
// Copyright (c) 2003
|
||
|
|
// Eric Friedman
|
||
|
|
//
|
||
|
|
// 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_DETAIL_ENABLE_RECURSIVE_FWD_HPP
|
||
|
|
#define BOOST_VARIANT_DETAIL_ENABLE_RECURSIVE_FWD_HPP
|
||
|
|
|
||
|
|
#include <boost/mpl/aux_/config/ctps.hpp>
|
||
|
|
|
||
|
|
#include <boost/mpl/bool_fwd.hpp>
|
||
|
|
|
||
|
|
# include <boost/mpl/bool.hpp>
|
||
|
|
|
||
|
|
namespace boost {
|
||
|
|
namespace detail { namespace variant {
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// (detail) tag recursive_flag
|
||
|
|
//
|
||
|
|
// Signifies that the variant should perform recursive substituion.
|
||
|
|
//
|
||
|
|
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
struct recursive_flag
|
||
|
|
{
|
||
|
|
typedef T type;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// (detail) metafunction is_recursive_flag
|
||
|
|
//
|
||
|
|
// Signifies that the variant should perform recursive substituion.
|
||
|
|
//
|
||
|
|
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
struct is_recursive_flag
|
||
|
|
: mpl::false_
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
struct is_recursive_flag< recursive_flag<T> >
|
||
|
|
: mpl::true_
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// (detail) metafunction enable_recursive
|
||
|
|
//
|
||
|
|
// Attempts recursive_variant_ tag substitution, wrapping with
|
||
|
|
// boost::recursive_wrapper if substituion occurs w/ non-indirect result
|
||
|
|
// (i.e., not a reference or pointer) *and* NoWrapper is false_.
|
||
|
|
//
|
||
|
|
template <
|
||
|
|
typename T
|
||
|
|
, typename RecursiveVariant
|
||
|
|
, typename NoWrapper = mpl::false_
|
||
|
|
>
|
||
|
|
struct enable_recursive;
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// (detail) metafunction class quoted_enable_recursive
|
||
|
|
//
|
||
|
|
// Same behavior as enable_recursive metafunction (see above).
|
||
|
|
//
|
||
|
|
template <
|
||
|
|
typename RecursiveVariant
|
||
|
|
, typename NoWrapper = mpl::false_
|
||
|
|
>
|
||
|
|
struct quoted_enable_recursive;
|
||
|
|
|
||
|
|
}} // namespace detail::variant
|
||
|
|
} // namespace boost
|
||
|
|
|
||
|
|
#endif // BOOST_VARIANT_DETAIL_ENABLE_RECURSIVE_FWD_HPP
|