ceph/src/arrow/cpp/src/arrow/util/int128_internal.h

   1 // Licensed to the Apache Software Foundation (ASF) under one
   2 // or more contributor license agreements.  See the NOTICE file
   3 // distributed with this work for additional information
   4 // regarding copyright ownership.  The ASF licenses this file
   5 // to you under the Apache License, Version 2.0 (the
   6 // "License"); you may not use this file except in compliance
   7 // with the License.  You may obtain a copy of the License at
   8 //
   9 //   http://www.apache.org/licenses/LICENSE-2.0
  10 //
  11 // Unless required by applicable law or agreed to in writing,
  12 // software distributed under the License is distributed on an
  13 // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  14 // KIND, either express or implied.  See the License for the
  15 // specific language governing permissions and limitations
  16 // under the License.
  17 #pragma once
  18
  19 #include "arrow/util/config.h"
  20 #include "arrow/util/macros.h"
  21
  22 #ifndef ARROW_USE_NATIVE_INT128
  23 #include <boost/multiprecision/cpp_int.hpp>
  24 #endif
  25
  26 namespace arrow {
  27 namespace internal {
  28
  29 // NOTE: __int128_t and boost::multiprecision::int128_t are not interchangeable.
  30 // For example, __int128_t does not have any member function, and does not have
  31 // operator<<(std::ostream, __int128_t). On the other hand, the behavior of
  32 // boost::multiprecision::int128_t might be surprising with some configs (e.g.,
  33 // static_cast<uint64_t>(boost::multiprecision::uint128_t) might return
  34 // ~uint64_t{0} instead of the lower 64 bits of the input).
  35 // Try to minimize the usage of int128_t and uint128_t.
  36 #ifdef ARROW_USE_NATIVE_INT128
  37 using int128_t = __int128_t;
  38 using uint128_t = __uint128_t;
  39 #else
  40 using boost::multiprecision::int128_t;
  41 using boost::multiprecision::uint128_t;
  42 #endif
  43
  44 }  // namespace internal
  45 }  // namespace arrow