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aka_compatibilty_with_cpp_standard.hh
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/**
* @file aka_compatibilty_with_cpp_standard.hh
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Fri Jun 18 2010
* @date last modification: Wed Jan 10 2018
*
* @brief The content of this file is taken from the possible implementations
* on
* http://en.cppreference.com
*
* @section LICENSE
*
* Copyright (©) 2010-2018 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/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "aka_static_if.hh"
/* -------------------------------------------------------------------------- */
#include <tuple>
#include <type_traits>
#include <utility>
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_AKA_COMPATIBILTY_WITH_CPP_STANDARD_HH
#define AKANTU_AKA_COMPATIBILTY_WITH_CPP_STANDARD_HH
namespace aka {
/* -------------------------------------------------------------------------- */
// Part taken from C++14
#if __cplusplus < 201402L
template <bool B, class T = void>
using enable_if_t = typename enable_if<B, T>::type;
#else
template <bool B, class T = void> using enable_if_t = std::enable_if_t<B, T>;
#endif
/* -------------------------------------------------------------------------- */
// Part taken from C++17
#if __cplusplus < 201703L
/* -------------------------------------------------------------------------- */
// bool_constant
template <bool B> using bool_constant = std::integral_constant<bool, B>;
namespace {
template <bool B> constexpr bool bool_constant_v = bool_constant<B>::value;
}
/* -------------------------------------------------------------------------- */
// conjunction
template <class...> struct conjunction : std::true_type {};
template <class B1> struct conjunction<B1> : B1 {};
template <class B1, class... Bn>
struct conjunction<B1, Bn...>
: std::conditional_t<bool(B1::value), conjunction<Bn...>, B1> {};
/* -------------------------------------------------------------------------- */
// disjunction
template <class...> struct disjunction : std::false_type {};
template <class B1> struct disjunction<B1> : B1 {};
template <class B1, class... Bn>
struct disjunction<B1, Bn...>
: std::conditional_t<bool(B1::value), B1, disjunction<Bn...>> {};
/* -------------------------------------------------------------------------- */
// negations
template <class B> struct negation : bool_constant<!bool(B::value)> {};
/* -------------------------------------------------------------------------- */
// invoke
namespace detail {
template <class T> struct is_reference_wrapper : std::false_type {};
template <class U>
struct is_reference_wrapper<std::reference_wrapper<U>> : std::true_type {};
template <class T, class Type, class T1, class... Args>
decltype(auto) INVOKE(Type T::*f, T1 &&t1, Args &&... args) {
static_if(std::is_member_function_pointer<decltype(f)>{})
.then_([&](auto &&f) {
static_if(std::is_base_of<T, std::decay_t<T1>>{})
.then_([&](auto &&f) {
return (std::forward<T1>(t1).*f)(std::forward<Args>(args)...);
})
.elseif(is_reference_wrapper<std::decay_t<T1>>{})([&](auto &&f) {
return (t1.get().*f)(std::forward<Args>(args)...);
})
.else_([&](auto &&f) {
return ((*std::forward<T1>(t1)).*f)(std::forward<Args>(args)...);
})(std::forward<decltype(f)>(f));
})
.else_([&](auto &&f) {
static_assert(std::is_member_object_pointer<decltype(f)>::value,
"f is not a member object");
static_assert(sizeof...(args) == 0, "f takes arguments");
static_if(std::is_base_of<T, std::decay_t<T1>>{})
.then_([&](auto &&f) { return std::forward<T1>(t1).*f; })
.elseif(std::is_base_of<T, std::decay_t<T1>>{})(
[&](auto &&f) { return t1.get().*f; })
.else_([&](auto &&f) { return (*std::forward<T1>(t1)).*f; })(
std::forward<decltype(f)>(f));
})(std::forward<decltype(f)>(f));
}
template <class F, class... Args>
decltype(auto) INVOKE(F &&f, Args &&... args) {
return std::forward<F>(f)(std::forward<Args>(args)...);
}
} // namespace detail
template <class F, class... Args>
decltype(auto) invoke(F &&f, Args &&... args) {
return detail::INVOKE(std::forward<F>(f), std::forward<Args>(args)...);
}
/* -------------------------------------------------------------------------- */
// apply
namespace detail {
template <class F, class Tuple, std::size_t... Is>
constexpr decltype(auto) apply_impl(F &&f, Tuple &&t,
std::index_sequence<Is...>) {
return invoke(std::forward<F>(f), std::get<Is>(std::forward<Tuple>(t))...);
}
} // namespace detail
/* -------------------------------------------------------------------------- */
template <class F, class Tuple>
constexpr decltype(auto) apply(F &&f, Tuple &&t) {
return detail::apply_impl(
std::forward<F>(f), std::forward<Tuple>(t),
std::make_index_sequence<std::tuple_size<std::decay_t<Tuple>>::value>{});
}
/* -------------------------------------------------------------------------- */
// count_if
template <class InputIt, class UnaryPredicate>
typename std::iterator_traits<InputIt>::difference_type
count_if(InputIt first, InputIt last, UnaryPredicate p) {
typename std::iterator_traits<InputIt>::difference_type ret = 0;
for (; first != last; ++first) {
if (p(*first)) {
ret++;
}
}
return ret;
}
#else
template <bool B> using bool_constant = std::bool_constant<B>;
template <bool B> using bool_constant_v = std::bool_constant_v<B>;
template <class... Args> using conjunction = std::conjunction<Args...>;
template <class... Args> using disjunction = std::disjunction<Args...>;
template <class B> using negation = std::negation<B>;
using invoke = std::invoke;
using apply = std::apply;
using count_if = std::count_if;
#endif
} // namespace aka
#endif /* AKANTU_AKA_COMPATIBILTY_WITH_CPP_STANDARD_HH */

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