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meta: A simple meta functionality added. (Untested)

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Christos Houtouridis 5 years ago
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7 changed files with 445 additions and 0 deletions
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  1. +48
    -0
      include/utl/meta/bool.h
  2. +64
    -0
      include/utl/meta/if.h
  3. +54
    -0
      include/utl/meta/integral.h
  4. +100
    -0
      include/utl/meta/logical.h
  5. +64
    -0
      include/utl/meta/sfinae.h
  6. +63
    -0
      include/utl/meta/void.h
  7. +52
    -0
      include/utl/meta/void_t.h

+ 48
- 0
include/utl/meta/bool.h View File

@@ -0,0 +1,48 @@
/*!
* \file bool.h
* \brief Template meta-programming bool integral constant
*
* 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 <http://www.gnu.org/licenses/>.
*/
#ifndef __utl_meta_bool_h__
#define __utl_meta_bool_h__
#include <utl/impl/version.h>
#include <utl/meta/integral.h>
/*!
* \ingroup meta
* \defgroup bool
* boolean constant type support header
*/
//! @{
namespace utl {
//! bool_ type
template<bool _v>
using bool_ = integral_<bool, _v>;
//! The type used as a compile-time boolean with true value.
typedef bool_<true> true_;
//! The type used as a compile-time boolean with false value.
typedef bool_<false> false_;
}
//! @}
#endif /* __utl_meta_bool_h__ */

+ 64
- 0
include/utl/meta/if.h View File

@@ -0,0 +1,64 @@
/*!
* \file if.h
* \brief Template meta-programming conditional 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 <http://www.gnu.org/licenses/>.
*/
#ifndef __utl_meta_if_h__
#define __utl_meta_if_h__
#include <utl/impl/version.h>
/*!
* \ingroup meta
* \defgroup if
* conditional type support header
*/
//! @{
namespace utl {
//! if_
//! @{
template <bool _C, typename _T1, typename _T2>
struct if_ {
typedef _T1 type;
};
template <typename _T1, typename _T2>
struct if_ <false, _T1, _T2> {
typedef _T2 type;
};
//! @}
//! enable_if
//! @{
template <bool, typename _Tp = void>
struct enable_if { };
// Partial specialization for true.
template<typename _Tp>
struct enable_if <true, _Tp> {
typedef _Tp type;
};
//! Alias template for enable_if
template<bool _C, typename _Tp = void>
using enable_if_t = typename enable_if<_C, _Tp>::type;
//! @}
}
//! @}
#endif /* __utl_meta_if_h__ */

+ 54
- 0
include/utl/meta/integral.h View File

@@ -0,0 +1,54 @@
/*!
* \file integral.h
* \brief Template meta-programming integral constant
*
* 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 <http://www.gnu.org/licenses/>.
*/
#ifndef __utl_meta_integral_h__
#define __utl_meta_integral_h__
#include <utl/impl/version.h>
/*!
* \ingroup meta
* \defgroup integral
* integral constand support header
*/
//! @{
namespace utl {
//! integral_constant
template <typename _Tp, _Tp _v>
struct integral_ {
using value_type = _Tp;
using type = integral_<_Tp, _v>;
constexpr operator value_type() const {
return value;
}
constexpr value_type operator()() const {
return value;
}
static constexpr _Tp value = _v;
};
template<typename _Tp, _Tp _v>
constexpr _Tp integral_<_Tp, _v>::value;
}
//!@}
#endif /* __utl_meta_integral_h__ */

+ 100
- 0
include/utl/meta/logical.h View File

@@ -0,0 +1,100 @@
/*!
* \file logical.h
* \brief Template meta-programming logic operator and type relations.
*
* 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 <http://www.gnu.org/licenses/>.
*/
#ifndef __utl_meta_logical_h__
#define __utl_meta_logical_h__
#include <utl/impl/version.h>
#include <utl/meta/bool.h>
#include <utl/meta/if.h>
/*!
* \ingroup meta
* \defgroup logic
* logic operator and type relations support header
*/
//! @{
namespace utl {
//! NOT implementation
template<bool C_>
struct not_ : bool_<!C_> { };
//! OR implementation
//! @{
template<typename...> struct or_;
template<>
struct or_<>
: false_ { };
template<typename _T1>
struct or_<_T1>
: _T1 { };
template<typename _T1, typename _T2>
struct or_ <_T1, _T2>
: if_<_T1::value, _T1, _T2>::type { };
template<typename _T1, typename _T2, typename _T3, typename... _Tn>
struct or_<_T1, _T2, _T3, _Tn...>
: if_<_T1::value, _T1, or_<_T2, _T3, _Tn...>>::type { };
//! @}
//! AND implementation
//! @{
template<typename...> struct and_;
template<>
struct and_<>
: true_ { };
template<typename _T1>
struct and_ <_T1>
: _T1 { };
template<typename _T1, typename _T2>
struct and_<_T1, _T2>
: if_<_T1::value, _T2, _T1>::type { };
template<typename _T1, typename _T2, typename _T3, typename... _Tn>
struct and_<_T1, _T2, _T3, _Tn...>
: if_<_T1::value, and_<_T2, _T3, _Tn...>, _T1>::type { };
//! @}
//! same
//! @{
template<typename _T1, typename _T2>
struct same_ : false_ { };
template<typename _Tp>
struct same_ <_Tp, _Tp> : true_ { };
//! @}
//! not same
//! @{
template<typename _T1, typename _T2>
struct not_same_ : true_ { };
template<typename _Tp>
struct not_same_ <_Tp, _Tp> : false_ { };
//! @}
}
#endif /* __utl_meta_logical_h__ */

+ 64
- 0
include/utl/meta/sfinae.h View File

@@ -0,0 +1,64 @@
/*!
* \file use.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 <http://www.gnu.org/licenses/>.
*/
#ifndef __utl_meta_use_h__
#define __utl_meta_use_h__
#include <utl/impl/version.h>
#include <utl/meta/logical.h>
/*!
* \ingroup meta
* \defgroup use
* conditional use support header. This is a SFINAE helper
*/
//! @{
namespace utl {
//! If same type resolves to _Ret, else to SFINAE
//! @{
template <typename _Tp1, typename _Tp2, typename _Ret>
struct use_if_same_ {
using type = enable_if_t <
same_<_Tp1, _Tp2>::value,
_Ret
>;
};
template <typename _Tp1, typename _Tp2, typename _Ret>
using use_if_same_t = typename use_if_same_<_Tp1, _Tp2, _Ret>::type;
//! @}
//! If same type resolves to SFINAE, else to _Ret
//! @{
template <typename _Tp1, typename _Tp2, typename _Ret>
struct discard_if_same_ {
using type = enable_if_t <
!same_<_Tp1, _Tp2>::value,
_Ret
>;
};
template <typename _Tp1, typename _Tp2, typename _Ret>
using discard_if_same_t = typename discard_if_same_<_Tp1, _Tp2, _Ret>::type;
//! @}
}
//! @}
#endif /* __utl_meta_use_h__ */

+ 63
- 0
include/utl/meta/void.h View File

@@ -0,0 +1,63 @@
/*!
* \file void.h
* \brief Template meta-programming void 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 <http://www.gnu.org/licenses/>.
*/
#ifndef __utl_meta_void_h__
#define __utl_meta_void_h__
#include <utl/impl/version.h>
#include <utl/meta/bool.h>
/*! \ingroup meta
* \defgroup void
* void_ support header
*/
//! @{
namespace utl {
/*!
* Like boost::mpl we made void_ a complete type to allow it to be
* instantiated so that it can be passed in as an object that can be
* used to select an overloaded function.
*/
struct void_ {
typedef void_ type;
};
template<typename _Tp>
struct is_void_
: false_ { };
template<>
struct is_void_ <void_>
: true_ { };
template<typename _Tp>
struct is_not_void_
: true_ { };
template<>
struct is_not_void_<void_>
: false_ { };
}
//!@}
#endif /* __utl_meta_void_h__ */

+ 52
- 0
include/utl/meta/void_t.h View File

@@ -0,0 +1,52 @@
/*!
* \file void_t.h
* \brief Template meta-programming 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 <http://www.gnu.org/licenses/>.
*/
#ifndef __utl_meta_void_t_h__
#define __utl_meta_void_t_h__
#include <utl/impl/version.h>
//! \ingroup meta
//! \defgroup void_t
//! A void_t implementation for utl
//! @{
namespace utl {
/*!
* Utility meta-function that maps a sequence of any types to the type void
* \note The idea is:
* template <typename ...>
* using void_t = void;
*
* Until CWG 1558 (a C++14 defect), unused parameters in alias templates were not
* guaranteed to ensure SFINAE and could be ignored, so earlier compilers require
* a more complex definition of void_t, such as the following implementation
* https://en.cppreference.com
*/
template<typename... _Ts>
struct void_impl {
typedef void type;
};
//! The actual void_t type alias
template<typename... _Ts>
using void_t = typename void_impl<_Ts...>::type;
}
//! @}
#endif /* __utl_meta_void_t_h__ */

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