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aka_typelist.hh
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/**
* @file aka_typelist.hh
*
* @author Alejandro M. Aragón <alejandro.aragon@epfl.ch>
*
* @date creation: Fri Jan 04 2013
* @date last modification: Mon Jun 19 2017
*
* @brief Objects that support the visitor design pattern
*
* @section LICENSE
*
* Copyright (©) 2014-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef __AKANTU_TYPELIST_HH__
#define __AKANTU_TYPELIST_HH__
#include "aka_common.hh"
namespace akantu {
struct Empty_type {};
class Null_type {};
template <class T, class U> struct Typelist {
typedef T Head;
typedef U Tail;
};
template <typename T1 = Null_type, typename T2 = Null_type,
typename T3 = Null_type, typename T4 = Null_type,
typename T5 = Null_type, typename T6 = Null_type,
typename T7 = Null_type, typename T8 = Null_type,
typename T9 = Null_type, typename T10 = Null_type,
typename T11 = Null_type, typename T12 = Null_type,
typename T13 = Null_type, typename T14 = Null_type,
typename T15 = Null_type, typename T16 = Null_type,
typename T17 = Null_type, typename T18 = Null_type,
typename T19 = Null_type, typename T20 = Null_type>
struct MakeTypelist {
private:
typedef typename MakeTypelist<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12,
T13, T14, T15, T16, T17, T18, T19, T20>::Result
TailResult;
public:
typedef Typelist<T1, TailResult> Result;
};
template <> struct MakeTypelist<> { typedef Null_type Result; };
////////////////////////////////////////////////////////////////////////////////
// class template Length
// Computes the length of a typelist
// Invocation (TList is a typelist):
// Length<TList>::value
// returns a compile-time constant containing the length of TList, not counting
// the end terminator (which by convention is Null_type)
////////////////////////////////////////////////////////////////////////////////
template <class TList> struct Length;
template <> struct Length<Null_type> {
enum { value = 0 };
};
template <class T, class U> struct Length<Typelist<T, U>> {
enum { value = 1 + Length<U>::value };
};
////////////////////////////////////////////////////////////////////////////////
// class template TypeAt
// Finds the type at a given index in a typelist
// Invocation (TList is a typelist and index is a compile-time integral
// constant):
// TypeAt<TList, index>::Result
// returns the type in position 'index' in TList
// If you pass an out-of-bounds index, the result is a compile-time error
////////////////////////////////////////////////////////////////////////////////
template <class TList, unsigned int index> struct TypeAt;
template <class Head, class Tail> struct TypeAt<Typelist<Head, Tail>, 0> {
typedef Head Result;
};
template <class Head, class Tail, unsigned int i>
struct TypeAt<Typelist<Head, Tail>, i> {
typedef typename TypeAt<Tail, i - 1>::Result Result;
};
////////////////////////////////////////////////////////////////////////////////
// class template Erase
// Erases the first occurence, if any, of a type in a typelist
// Invocation (TList is a typelist and T is a type):
// Erase<TList, T>::Result
// returns a typelist that is TList without the first occurence of T
////////////////////////////////////////////////////////////////////////////////
template <class TList, class T> struct Erase;
template <class T> // Specialization 1
struct Erase<Null_type, T> {
typedef Null_type Result;
};
template <class T, class Tail> // Specialization 2
struct Erase<Typelist<T, Tail>, T> {
typedef Tail Result;
};
template <class Head, class Tail, class T> // Specialization 3
struct Erase<Typelist<Head, Tail>, T> {
typedef Typelist<Head, typename Erase<Tail, T>::Result> Result;
};
template <class TList, class T> struct IndexOf;
template <class T> struct IndexOf<Null_type, T> {
enum { value = -1 };
};
template <class T, class Tail> struct IndexOf<Typelist<T, Tail>, T> {
enum { value = 0 };
};
template <class Head, class Tail, class T>
struct IndexOf<Typelist<Head, Tail>, T> {
private:
enum { temp = IndexOf<Tail, T>::value };
public:
enum { value = (temp == -1 ? -1 : 1 + temp) };
};
} // namespace akantu
#endif /* __AKANTU_TYPELIST_HH__ */
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