libcxx/test/support/MoveOnly.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef MOVEONLY_H
  10 #define MOVEONLY_H
  11
  12 #include "test_macros.h"
  13
  14 #if TEST_STD_VER >= 11
  15
  16 #include <cstddef>
  17 #include <functional>
  18
  19 class MoveOnly
  20 {
  21     MoveOnly(const MoveOnly&);
  22     MoveOnly& operator=(const MoveOnly&);
  23
  24     int data_;
  25 public:
  26     constexpr MoveOnly(int data = 1) : data_(data) {}
  27     TEST_CONSTEXPR_CXX14 MoveOnly(MoveOnly&& x)
  28         : data_(x.data_) {x.data_ = 0;}
  29     TEST_CONSTEXPR_CXX14 MoveOnly& operator=(MoveOnly&& x)
  30         {data_ = x.data_; x.data_ = 0; return *this;}
  31
  32     constexpr int get() const {return data_;}
  33
  34     constexpr bool operator==(const MoveOnly& x) const {return data_ == x.data_;}
  35     constexpr bool operator< (const MoveOnly& x) const {return data_ <  x.data_;}
  36     TEST_CONSTEXPR_CXX14 MoveOnly operator+(const MoveOnly& x) const
  37         { return MoveOnly{data_ + x.data_}; }
  38     TEST_CONSTEXPR_CXX14 MoveOnly operator*(const MoveOnly& x) const
  39         { return MoveOnly{data_ * x.data_}; }
  40 };
  41
  42 namespace std {
  43
  44 template <>
  45 struct hash<MoveOnly>
  46 {
  47     typedef MoveOnly argument_type;
  48     typedef size_t result_type;
  49     constexpr std::size_t operator()(const MoveOnly& x) const {return x.get();}
  50 };
  51
  52 }
  53
  54 #endif  // TEST_STD_VER >= 11
  55
  56 #endif  // MOVEONLY_H