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/**
* Copyright © 2018 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <boost/asio/spawn.hpp>
#include <boost/callable_traits.hpp>
#include <cstdint>
#include <map>
#include <memory>
#include <string>
#include <tuple>
#include <type_traits>
#include <vector>
namespace ipmi
{
struct Context;
namespace utility
{
/**
* @brief a utility template to extract the args after N from a tuple
*
* Given a tuple of type <T1, ...TN, TN+1, ...>, provide type = tuple<TN+1,...>
*/
template <std::size_t N, typename FirstArg, typename... Rest>
struct StripFirstArgs;
template <std::size_t N, typename FirstArg, typename... Rest>
struct StripFirstArgs<N, std::tuple<FirstArg, Rest...>>
: StripFirstArgs<N - 1, std::tuple<Rest...>>
{
};
template <typename FirstArg, typename... Rest>
struct StripFirstArgs<0, std::tuple<FirstArg, Rest...>>
{
using type = std::tuple<FirstArg, Rest...>;
};
template <std::size_t N>
struct StripFirstArgs<N, std::tuple<>>
{
using type = std::tuple<>;
};
/**
* @brief a utility template to extract the remaining args from a tuple
*
* Given a tuple of type <T1, T2,...>, provide type = tuple<T2,...>
*/
template <typename T>
using StripFirstArg = StripFirstArgs<1, T>;
/**
* @brief a utility template to find the number of non-special arguments
*
* Given a tuple, count the args after the first special args
*/
template <typename FirstArg, typename... Rest>
struct NonIpmiArgsCount;
template <>
struct NonIpmiArgsCount<std::tuple<>>
{
constexpr static std::size_t size()
{
return 0;
}
};
template <typename FirstArg, typename... OtherArgs>
struct NonIpmiArgsCount<std::tuple<FirstArg, OtherArgs...>>
{
constexpr static std::size_t size()
{
if constexpr (std::is_same<FirstArg, ipmi::Context>::value ||
std::is_same<FirstArg, boost::asio::yield_context>::value)
{
return 1 + NonIpmiArgsCount<std::tuple<OtherArgs...>>::size();
}
else
{
return NonIpmiArgsCount<std::tuple<OtherArgs...>>::size();
}
}
};
/**
* @brief a utility template to find the type of the first arg
*
* Given a tuple, provide the type of the first element
*/
template <typename T>
struct GetFirstArg
{
using type = void;
};
template <typename FirstArg, typename... Rest>
struct GetFirstArg<std::tuple<FirstArg, Rest...>>
{
using type = FirstArg;
};
/**
* @brief a utility template to remove const and reference from types
*
* Given a tuple, provide the type of the first element
*/
template <typename... Args>
struct DecayTuple;
template <typename... Args>
struct DecayTuple<std::tuple<Args...>>
{
using type = std::tuple<typename std::decay<Args>::type...>;
};
/** @brief Convert T[N] to T* if is_same<Tbase,T>
*
* @tparam Tbase - The base type expected.
* @tparam T - The type to convert.
*/
template <typename Tbase, typename T>
using ArrayToPtr_t = typename std::conditional_t<
std::is_array<T>::value,
std::conditional_t<std::is_same<Tbase, std::remove_extent_t<T>>::value,
std::add_pointer_t<std::remove_extent_t<T>>, T>,
T>;
/** @brief Downcast type submembers.
*
* This allows std::tuple and std::pair members to be downcast to their
* non-const, nonref versions of themselves to limit duplication in template
* specializations
*
* 1. Remove references.
* 2. Remove 'const' and 'volatile'.
* 3. Convert 'char[N]' to 'char*'.
*/
template <typename T>
struct DowncastMembers
{
using type = T;
};
template <typename... Args>
struct DowncastMembers<std::pair<Args...>>
{
using type = std::pair<utility::ArrayToPtr_t<
char, std::remove_cv_t<std::remove_reference_t<Args>>>...>;
};
template <typename... Args>
struct DowncastMembers<std::tuple<Args...>>
{
using type = std::tuple<utility::ArrayToPtr_t<
char, std::remove_cv_t<std::remove_reference_t<Args>>>...>;
};
template <typename T>
using DowncastMembers_t = typename DowncastMembers<T>::type;
/** @brief Convert some C++ types to others for 'TypeId' conversion purposes.
*
* Similar C++ types have the same dbus type-id, so 'downcast' those to limit
* duplication in TypeId template specializations.
*
* 1. Remove references.
* 2. Remove 'const' and 'volatile'.
* 3. Convert 'char[N]' to 'char*'.
*/
template <typename T>
struct TypeIdDowncast
{
using type = utility::ArrayToPtr_t<
char, DowncastMembers_t<std::remove_cv_t<std::remove_reference_t<T>>>>;
};
template <typename T>
using TypeIdDowncast_t = typename TypeIdDowncast<T>::type;
/** @brief Detect if a type is a tuple
*
*/
template <typename>
struct is_tuple : std::false_type
{
};
template <typename... T>
struct is_tuple<std::tuple<T...>> : std::true_type
{
};
} // namespace utility
} // namespace ipmi
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