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Fri, May 17, 13:08

aka_named_tuple.hh
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/**
* @file aka_tuple_tools.hh
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Fri Aug 11 2017
* @date last modification: Mon Jan 29 2018
*
* @brief iterator interfaces
*
*
* Copyright 2019 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_compatibilty_with_cpp_standard.hh"
#include "aka_str_hash.hh"
/* -------------------------------------------------------------------------- */
#include <iostream>
#include <tuple>
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_AKA_NAMED_TUPLE_HH
#define AKANTU_AKA_NAMED_TUPLE_HH
#ifndef AKANTU_ITERATORS_NAMESPACE
#define AKANTU_ITERATORS_NAMESPACE akantu
#endif
namespace AKANTU_ITERATORS_NAMESPACE {
namespace tuple {
using hash_type = uint64_t;
/* ------------------------------------------------------------------------ */
template <typename tag, typename type> struct named_tag {
using _tag = tag;
using _type = type;
template <typename T,
std::enable_if_t<not std::is_same_v<named_tag, T>> * = nullptr>
named_tag(T && value) : _value(std::forward<T>(value)) {}
type _value;
};
#if (defined(__GNUC__) || defined(__GNUG__))
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Weffc++"
#endif
namespace details {
template <typename tag> struct named_tag_proxy {
using _tag = tag;
template <typename T> auto operator=(T && value) -> decltype(auto) {
return named_tag<tag, T>{std::forward<T>(value)};
}
};
} // namespace details
#if (defined(__GNUC__) || defined(__GNUG__))
#pragma GCC diagnostic pop
#endif
template <typename CharT, CharT... chars> struct string_literal {
static constexpr tuple::hash_type hash =
hash::details::fnv1a<tuple::hash_type, CharT, chars...>();
using hash_type = std::integral_constant<tuple::hash_type, hash>;
};
/* ------------------------------------------------------------------------ */
template <typename T> struct is_named_tag : public std::false_type {};
template <typename tag>
struct is_named_tag<details::named_tag_proxy<tag>> : public std::true_type {};
template <typename tag, typename type>
struct is_named_tag<named_tag<tag, type>> : public std::true_type {};
template <typename T> constexpr bool is_named_tag_v = is_named_tag<T>::value;
/* ------------------------------------------------------------------------ */
template <class... Params>
struct named_tuple : public std::tuple<typename Params::_type...> {
using Index = int;
using Names_t = std::tuple<typename Params::_tag...>;
using parent = std::tuple<typename Params::_type...>;
named_tuple(Params &&... params)
: parent(std::forward<typename Params::_type>(params._value)...) {}
named_tuple(typename Params::_type &&... args)
: parent(std::forward<typename Params::_type>(args)...) {}
template <typename tag, Index Idx>
struct get_element_index_helper
: public std::integral_constant<
Index, (std::is_same_v<std::tuple_element_t<Idx, Names_t>, tag>)
? Idx
: get_element_index_helper<tag, Idx + 1>()> {};
template <typename tag>
struct get_element_index_helper<tag, sizeof...(Params)>
: public std::integral_constant<Index, -1> {};
template <typename NT>
static constexpr auto get_element_index() noexcept -> Index {
return get_element_index_helper<typename NT::_tag, 0>::value;
}
template <typename NT>
static constexpr auto get_element_index(NT && /*unused*/) noexcept
-> Index {
return get_element_index_helper<typename NT::_tag, 0>::value;
}
template <typename NT, std::enable_if_t<is_named_tag_v<NT>> * = nullptr>
inline constexpr auto get(NT && /*unused*/) noexcept -> decltype(auto) {
const auto index = get_element_index<NT>();
static_assert((index != Index(-1)), "wrong named_tag");
return (std::get<index>(*this));
}
template <typename NT, std::enable_if_t<is_named_tag_v<NT>> * = nullptr>
inline constexpr auto get(NT && /*unused*/) const noexcept
-> decltype(auto) {
const auto index = get_element_index<NT>();
static_assert((index != Index(-1)), "wrong named_tag");
return (std::get<index>(*this));
}
template <typename NT,
std::enable_if_t<is_named_tag<NT>::value> * = nullptr>
inline constexpr auto operator[](NT && name_tag) const noexcept
-> decltype(auto) {
return get(std::forward<NT>(name_tag));
}
template <typename NT,
std::enable_if_t<is_named_tag<NT>::value> * = nullptr>
inline static constexpr auto has(NT && /*unused*/) noexcept -> bool {
const auto index = get_element_index<NT>();
return (index != Index(-1));
}
template <typename NT,
std::enable_if_t<is_named_tag<NT>::value> * = nullptr>
static constexpr auto has() noexcept -> bool {
constexpr auto index = get_element_index<NT>();
return (index != Index(-1));
}
// template <hash_type HashCode> static constexpr auto has() noexcept ->
// bool {
// constexpr auto index =
// get_element_index_helper<std::integral_constant<hash_type,
// HashCode>,
// 0>::value;
// return (index != Index(-1));
// }
};
/* ---------------------------------------------------------------------- */
template <typename T> struct is_named_tuple : public std::false_type {};
template <typename... Params>
struct is_named_tuple<named_tuple<Params...>> : public std::true_type {};
template <typename T>
constexpr bool is_named_tuple_v = is_named_tuple<T>::value;
/* ---------------------------------------------------------------------- */
template <typename... Params>
constexpr auto make_named_tuple(Params &&... params) noexcept
-> named_tuple<Params...> {
return named_tuple<Params...>(std::forward<Params>(params)...);
}
template <typename tag>
constexpr auto make_named_tag() noexcept -> decltype(auto) {
return details::named_tag_proxy<tag>{};
}
template <typename Tag, class Tuple> constexpr auto has() -> bool {
return std::decay_t<Tuple>::template has<Tag>();
}
template <typename Tag, class Tuple>
constexpr auto has(Tag && /**/, Tuple && /**/) -> bool {
return has<std::decay_t<Tag>, std::decay_t<Tuple>>();
}
template <typename Tag, class Tuple> constexpr auto has(Tag && /**/) -> bool {
return has<std::decay_t<Tag>, std::decay_t<Tuple>>();
}
template <typename Param, typename Tuple,
std::enable_if_t<is_named_tag_v<Param>> * = nullptr>
constexpr auto get(Tuple && tuple) noexcept -> decltype(auto) {
return tuple.template get<typename Param::hash>();
}
template <std::size_t I, class Tuple> struct tuple_name_tag {
using type = std::decay_t<
std::tuple_element_t<I, typename std::decay_t<Tuple>::Names_t>>;
};
template <std::size_t I, class Tuple>
using tuple_name_tag_t = typename tuple_name_tag<I, Tuple>::type;
template <std::size_t I, class Tuple> struct tuple_element {
using type = std::tuple_element_t<I, typename Tuple::parent>;
};
template <std::size_t I, class Tuple>
using tuple_element_t = typename tuple_element<I, Tuple>::type;
namespace details {
template <class Tuple, std::size_t... Is>
void printTuple(std::ostream & stream, Tuple && /*tuple*/,
std::index_sequence<Is...> && /*unused*/) {
std::initializer_list<int>{
((stream << "{"
<< std::tuple_element_t<
Is, typename std::decay_t<Tuple>::Names_t>::value
<< "}"),
0)...};
}
} // namespace details
template <class... Params>
std::ostream & operator<<(std::ostream & stream,
const named_tuple<Params...> & tuple) {
details::printTuple(stream, tuple,
std::make_index_sequence<sizeof...(Params)>{});
return stream;
}
} // namespace tuple
#if defined(__INTEL_COMPILER)
// intel warnings here
#elif defined(__clang__)
// clang warnings here
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wgnu-string-literal-operator-template"
#elif (defined(__GNUC__) || defined(__GNUG__))
// gcc warnings here
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpedantic"
#endif
/// this is a GNU exstension
/// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3599.html
template <typename C, C... chars>
constexpr auto operator"" _n() -> decltype(auto) {
return tuple::make_named_tag<tuple::string_literal<C, chars...>>();
}
#if defined(__clang__)
#pragma clang diagnostic pop
#elif (defined(__GNUC__) || defined(__GNUG__))
#pragma GCC diagnostic pop
#endif
template <typename T> struct named_tuple_type {
static_assert(tuple::is_named_tuple_v<std::decay_t<T>>,
"T is not named_tuple type");
using type = std::decay_t<T>;
};
// just for readability
template <typename T> using named_tuple_t = typename named_tuple_type<T>::type;
} // namespace AKANTU_ITERATORS_NAMESPACE
namespace aka {
template <typename tag, typename type_>
struct size_type<AKANTU_ITERATORS_NAMESPACE::tuple::named_tag<tag, type_>> {
using type = typename std::decay_t<type_>::size_type;
};
} // namespace aka
/* -------------------------------------------------------------------------- */
#include <iterator>
/* -------------------------------------------------------------------------- */
namespace std {
template <typename tag, typename type>
struct iterator_traits<
::AKANTU_ITERATORS_NAMESPACE::tuple::named_tag<tag, type>>
: public iterator_traits<type> {};
template <class... Types>
struct tuple_size<AKANTU_ITERATORS_NAMESPACE::tuple::named_tuple<Types...>>
: std::integral_constant<std::size_t, sizeof...(Types)> {};
} // namespace std
#endif /* AKANTU_AKA_NAMED_TUPLE_HH */

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