1 // Copyright 2017 The Chromium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_TEST_MOVE_ONLY_INT_H_ 6 #define BASE_TEST_MOVE_ONLY_INT_H_ 7 8 namespace base { 9 10 // A move-only class that holds an integer. This is designed for testing 11 // containers. See also CopyOnlyInt. 12 class MoveOnlyInt { 13 public: data_(data)14 explicit MoveOnlyInt(int data = 1) : data_(data) {} MoveOnlyInt(MoveOnlyInt && other)15 MoveOnlyInt(MoveOnlyInt&& other) : data_(other.data_) { other.data_ = 0; } 16 17 MoveOnlyInt(const MoveOnlyInt&) = delete; 18 MoveOnlyInt& operator=(const MoveOnlyInt&) = delete; 19 ~MoveOnlyInt()20 ~MoveOnlyInt() { data_ = 0; } 21 22 MoveOnlyInt& operator=(MoveOnlyInt&& other) { 23 data_ = other.data_; 24 other.data_ = 0; 25 return *this; 26 } 27 28 friend bool operator==(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) { 29 return lhs.data_ == rhs.data_; 30 } 31 32 friend bool operator!=(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) { 33 return !operator==(lhs, rhs); 34 } 35 36 friend bool operator<(const MoveOnlyInt& lhs, int rhs) { 37 return lhs.data_ < rhs; 38 } 39 40 friend bool operator<(int lhs, const MoveOnlyInt& rhs) { 41 return lhs < rhs.data_; 42 } 43 44 friend bool operator<(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) { 45 return lhs.data_ < rhs.data_; 46 } 47 48 friend bool operator>(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) { 49 return rhs < lhs; 50 } 51 52 friend bool operator<=(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) { 53 return !(rhs < lhs); 54 } 55 56 friend bool operator>=(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) { 57 return !(lhs < rhs); 58 } 59 data()60 int data() const { return data_; } 61 62 private: 63 volatile int data_; 64 }; 65 66 } // namespace base 67 68 #endif // BASE_TEST_MOVE_ONLY_INT_H_ 69