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// Copyright (c) 2014
// INRIA Saclay-Ile de France (France)
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1.1/NewKernel_d/include/CGAL/typeset.h $
// $Id: include/CGAL/typeset.h 08b27d3db14 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s) : Marc Glisse
#ifndef CGAL_TYPESET_H
#define CGAL_TYPESET_H
#include <CGAL/config.h>
#include <type_traits>
// Sometimes using tuple just to list types is overkill (takes forever to
// instantiate).
namespace CGAL {
template<class...> struct typeset;
template<class H,class...U> struct typeset<H,U...> {
typedef H head;
typedef typeset<U...> tail;
typedef typeset type;
template<class X> using contains = typename
std::conditional<
std::is_same<H,X>::value,
std::true_type,
typename tail::template contains<X>
>::type;
template<class X> using add = typename
std::conditional<
contains<X>::value,
typeset<H,U...>,
typeset<H,U...,X>
>::type;
};
template<> struct typeset<> {
typedef typeset type;
template<class X> using contains = std::false_type;
template<class X> using add = typeset<X>;
};
struct typeset_all {
typedef typeset_all type;
template<class X> using contains = std::true_type;
template<class X> using add = typeset_all;
};
template<class T1, class T2> struct typeset_union_ :
typeset_union_<typename T1::template add<typename T2::head>::type, typename T2::tail>
{};
template<class T> struct typeset_union_ <T, typeset<> > : T {};
template<class T> struct typeset_union_ <T, typeset_all > : typeset_all {};
template<class T1, class T2>
struct typeset_intersection_ {
typedef typename T1::head H;
typedef typename typeset_intersection_<typename T1::tail,T2>::type U;
typedef typename
std::conditional<T2::template contains<H>::value,
typename U::template add<H>::type, U>::type type;
};
template<class T> struct typeset_intersection_<typeset<>, T> : typeset<> {};
template<class T> struct typeset_intersection_<typeset_all, T> : T {};
template<class T1, class T2>
using typeset_union = typename typeset_union_<T1,T2>::type;
template<class T1, class T2>
using typeset_intersection = typename typeset_intersection_<T1,T2>::type;
}
#endif
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