<commit_before>/*
 * Copyright 2017 Facebook, Inc.
 *
 * 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.
 */

/**
 * Various low-level, bit-manipulation routines.
 *
 * findFirstSet(x)  [constexpr]
 *    find first (least significant) bit set in a value of an integral type,
 *    1-based (like ffs()).  0 = no bits are set (x == 0)
 *
 * findLastSet(x)  [constexpr]
 *    find last (most significant) bit set in a value of an integral type,
 *    1-based.  0 = no bits are set (x == 0)
 *    for x != 0, findLastSet(x) == 1 + floor(log2(x))
 *
 * nextPowTwo(x)  [constexpr]
 *    Finds the next power of two >= x.
 *
 * isPowTwo(x)  [constexpr]
 *    return true iff x is a power of two
 *
 * popcount(x)
 *    return the number of 1 bits in x
 *
 * Endian
 *    convert between native, big, and little endian representation
 *    Endian::big(x)      big <-> native
 *    Endian::little(x)   little <-> native
 *    Endian::swap(x)     big <-> little
 *
 * BitIterator
 *    Wrapper around an iterator over an integral type that iterates
 *    over its underlying bits in MSb to LSb order
 *
 * findFirstSet(BitIterator begin, BitIterator end)
 *    return a BitIterator pointing to the first 1 bit in [begin, end), or
 *    end if all bits in [begin, end) are 0
 *
 * @author <NAME> (<EMAIL>)
 */

#pragma once

#if !defined(__clang__) && !(defined(_MSC_VER) && (_MSC_VER < 1900))
#define FOLLY_INTRINSIC_CONSTEXPR constexpr
#else
// GCC and MSVC 2015+ are the only compilers with
// intrinsics constexpr.
#define FOLLY_INTRINSIC_CONSTEXPR const
#endif

#include <cassert>
#include <cinttypes>
#include <cstdint>
#include <cstring>
#include <iterator><commit_msg>Add support for clang intrinsic constexpr<commit_after>/*
 * Copyright 2017 Facebook, Inc.
 *
 * 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.
 */

/**
 * Various low-level, bit-manipulation routines.
 *
 * findFirstSet(x)  [constexpr]
 *    find first (least significant) bit set in a value of an integral type,
 *    1-based (like ffs()).  0 = no bits are set (x == 0)
 *
 * findLastSet(x)  [constexpr]
 *    find last (most significant) bit set in a value of an integral type,
 *    1-based.  0 = no bits are set (x == 0)
 *    for x != 0, findLastSet(x) == 1 + floor(log2(x))
 *
 * nextPowTwo(x)  [constexpr]
 *    Finds the next power of two >= x.
 *
 * isPowTwo(x)  [constexpr]
 *    return true iff x is a power of two
 *
 * popcount(x)
 *    return the number of 1 bits in x
 *
 * Endian
 *    convert between native, big, and little endian representation
 *    Endian::big(x)      big <-> native
 *    Endian::little(x)   little <-> native
 *    Endian::swap(x)     big <-> little
 *
 * BitIterator
 *    Wrapper around an iterator over an integral type that iterates
 *    over its underlying bits in MSb to LSb order
 *
 * findFirstSet(BitIterator begin, BitIterator end)
 *    return a BitIterator pointing to the first 1 bit in [begin, end), or
 *    end if all bits in [begin, end) are 0
 *
 * @author <NAME> (<EMAIL>)
 */

#pragma once

// MSVC does not support intrinsics constexpr
#if defined(_MSC_VER)
#define FOLLY_INTRINSIC_CONSTEXPR const
#else
#define FOLLY_INTRINSIC_CONSTEXPR constexpr
#endif

#include <cassert>
#include <cinttypes>
#include <cstdint>
#include <cstring>
#include <iterator>
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