folly/folly/compression/Select64.cpp

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * 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.
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#include <folly/compression/Select64.h>

#include <cstdint>
#include <utility>

#include <folly/ConstexprMath.h>
#include <folly/Portability.h>
#include <folly/Utility.h>

namespace folly {
namespace detail {

namespace {

constexpr std::uint8_t selectInByte(std::size_t i, std::size_t j) { … }

template <std::size_t... I, std::size_t J>
constexpr auto makeSelectInByteNestedArray(
    std::index_sequence<I...>, index_constant<J>) { … }

template <typename Is, std::size_t... J>
constexpr auto makeSelectInByteArray(Is is, std::index_sequence<J...>) { … }

} // namespace

FOLLY_STORAGE_CONSTEXPR std::array<std::array<std::uint8_t, 256>, 8> const
    kSelectInByte = …;

} // namespace detail
} // namespace folly