/*!
* \file useif.h
* \brief Template meta-programming SFINAE helpers
*
* Copyright (C) 2018 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_useif_h__
#define __utl_meta_useif_h__
#include
#include
#include
/*!
* \ingroup meta
* \defgroup sfinae
* conditional use support header. This is a SFINAE wrapper
*/
//! @{
namespace utl {
namespace meta {
//! If same type resolves to _Ret, else SFINAE
template
using use_if_same_t = enable_if_t<
same_<_T1, _T2>::value, _Ret
>;
//! If not same type resolves to _Ret, else SFINAE
template
using use_if_not_same_t = enable_if_t<
!same_<_T1, _T2>::value, _Ret
>;
//! If any type (_T1 or _T2) type resolves to _Ret, else to SFINAE
template
using use_if_any_t = enable_if_t<
or_::value, T1
>;
//! If both type (_T1 and _T2) type resolves to _Ret, else to SFINAE
template
using use_if_all_t = enable_if_t<
and_::value, T1
>;
}}
//! @}
#endif /* __utl_meta_useif_h__ */