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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_ALLOCATOR_DISPATCHER_TESTING_TOOLS_H_
#define BASE_ALLOCATOR_DISPATCHER_TESTING_TOOLS_H_
#include <array>
#include <tuple>
#include <utility>
namespace base::allocator::dispatcher::testing {
namespace internal {
template <size_t Size, typename Type, typename... AppendedTypes>
struct DefineTupleFromSingleType {
using type = typename DefineTupleFromSingleType<Size - 1,
Type,
AppendedTypes...,
Type>::type;
};
template <typename Type, typename... AppendedTypes>
struct DefineTupleFromSingleType<0, Type, AppendedTypes...> {
using type = std::tuple<AppendedTypes...>;
};
} // namespace internal
template <size_t Size, typename Type>
struct DefineTupleFromSingleType {
using type = typename internal::DefineTupleFromSingleType<Size, Type>::type;
};
template <typename Type, size_t Size, size_t... Indices>
typename internal::DefineTupleFromSingleType<Size, Type*>::type
CreateTupleOfPointers(std::array<Type, Size>& items,
std::index_sequence<Indices...>) {
return std::make_tuple((&items[Indices])...);
}
template <typename Type, size_t Size>
typename internal::DefineTupleFromSingleType<Size, Type*>::type
CreateTupleOfPointers(std::array<Type, Size>& items) {
return CreateTupleOfPointers(items, std::make_index_sequence<Size>{});
}
} // namespace base::allocator::dispatcher::testing
#endif // BASE_ALLOCATOR_DISPATCHER_TESTING_TOOLS_H_
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