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/* -*- mode: C++; indent-tabs-mode: nil; -*-
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*
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* This file is a part of LEMON, a generic C++ optimization library.
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*
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* Copyright (C) 2003-2008
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* Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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* (Egervary Research Group on Combinatorial Optimization, EGRES).
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*
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* Permission to use, modify and distribute this software is granted
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* provided that this copyright notice appears in all copies. For
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* precise terms see the accompanying LICENSE file.
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*
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* This software is provided "AS IS" with no warranty of any kind,
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* express or implied, and with no claim as to its suitability for any
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* purpose.
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*
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*/
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// This file contains a modified version of the enable_if library from BOOST.
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// See the appropriate copyright notice below.
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// Boost enable_if library
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// Copyright 2003 (c) The Trustees of Indiana University.
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// Use, modification, and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Authors: Jaakko Jarvi (jajarvi at osl.iu.edu)
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// Jeremiah Willcock (jewillco at osl.iu.edu)
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// Andrew Lumsdaine (lums at osl.iu.edu)
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#ifndef LEMON_BITS_UTILITY_H
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#define LEMON_BITS_UTILITY_H
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///\file
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///\brief Miscellaneous basic utilities
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///
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///\todo Please rethink the organisation of the basic files like this.
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///E.g. this file might be merged with invalid.h.
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namespace lemon
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{
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/// Basic type for defining "tags". A "YES" condition for \c enable_if.
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/// Basic type for defining "tags". A "YES" condition for \c enable_if.
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///
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///\sa False
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///
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/// \todo This should go to a separate "basic_types.h" (or something)
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/// file.
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struct True {
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///\e
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static const bool value = true;
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};
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/// Basic type for defining "tags". A "NO" condition for \c enable_if.
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/// Basic type for defining "tags". A "NO" condition for \c enable_if.
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///
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///\sa True
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struct False {
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///\e
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static const bool value = false;
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};
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struct InvalidType {
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};
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template <typename T>
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struct Wrap {
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const T &value;
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Wrap(const T &t) : value(t) {}
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};
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/**************** dummy class to avoid ambiguity ****************/
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template<int T> struct dummy { dummy(int) {} };
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/**************** enable_if from BOOST ****************/
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template <typename Type, typename T = void>
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struct exists {
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typedef T type;
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};
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template <bool B, class T = void>
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struct enable_if_c {
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typedef T type;
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};
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template <class T>
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struct enable_if_c<false, T> {};
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template <class Cond, class T = void>
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struct enable_if : public enable_if_c<Cond::value, T> {};
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template <bool B, class T>
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struct lazy_enable_if_c {
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typedef typename T::type type;
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};
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template <class T>
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struct lazy_enable_if_c<false, T> {};
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template <class Cond, class T>
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struct lazy_enable_if : public lazy_enable_if_c<Cond::value, T> {};
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template <bool B, class T = void>
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struct disable_if_c {
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typedef T type;
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};
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template <class T>
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struct disable_if_c<true, T> {};
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template <class Cond, class T = void>
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struct disable_if : public disable_if_c<Cond::value, T> {};
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template <bool B, class T>
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struct lazy_disable_if_c {
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typedef typename T::type type;
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};
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template <class T>
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struct lazy_disable_if_c<true, T> {};
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template <class Cond, class T>
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struct lazy_disable_if : public lazy_disable_if_c<Cond::value, T> {};
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} // namespace lemon
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#endif
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