/*!
* \file logical.h
* \brief Template meta-programming logic operator and type relations.
*
* Copyright (C) 2018-2019 Christos Choutouridis
*
* This program 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.
*
* This program 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 this program. If not, see .
*/
#ifndef __utl_meta_logical_h__
#define __utl_meta_logical_h__
#include
#include
/*!
* \ingroup meta
* \defgroup logic
* logic operator and type relations support header
*/
//! @{
namespace utl {
namespace meta{
/*!
* Logical relation for types
*/
//! @{
//! Negate the *bool* constant parameter
template
using not_c = bool_;
//! not
template
using not_ = not_c<_Tp::type::value>;
//! OR implementation
//! @{
namespace detail {
template struct _or_;
template<>
struct _or_<> : false_ { };
template
struct _or_<_T1> : _T1 { };
template
struct _or_ <_T1, _T2>
: if_<_T1, _T1, _T2> { };
template
struct _or_<_T1, _T2, _T3, _Tn...>
: if_<_T1, _T1, _or_<_T2, _T3, _Tn...>> { };
}
template
using or_ = eval>;
//! @}
//! AND implementation
//! @{
namespace detail {
template struct _and_;
template<>
struct _and_<>
: true_ { };
template
struct _and_ <_T1>
: _T1 { };
template
struct _and_<_T1, _T2>
: if_<_T1, _T2, _T1> { };
template
struct _and_<_T1, _T2, _T3, _Tn...>
: if_<_T1, _and_<_T2, _T3, _Tn...>, _T1> { };
}
template
using and_ = eval>;
//! @}
//! same
//! @{
template
struct same_ : false_ { };
template
struct same_ <_Tp, _Tp> : true_ { };
//! @}
//! not same
//! @{
template
using not_same_ = not_>>;
//! @}
//! @}
}}
//! @}
#endif /* __utl_meta_logical_h__ */