Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 1 | #ifndef MOVEONLY_H |
| 2 | #define MOVEONLY_H |
| 3 | |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 4 | #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 5 | |
| 6 | #include <cstddef> |
| 7 | #include <functional> |
| 8 | |
| 9 | class MoveOnly |
| 10 | { |
| 11 | MoveOnly(const MoveOnly&); |
| 12 | MoveOnly& operator=(const MoveOnly&); |
| 13 | |
| 14 | int data_; |
| 15 | public: |
| 16 | MoveOnly(int data = 1) : data_(data) {} |
| 17 | MoveOnly(MoveOnly&& x) |
| 18 | : data_(x.data_) {x.data_ = 0;} |
| 19 | MoveOnly& operator=(MoveOnly&& x) |
| 20 | {data_ = x.data_; x.data_ = 0; return *this;} |
| 21 | |
| 22 | int get() const {return data_;} |
| 23 | |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 24 | bool operator==(const MoveOnly& x) const {return data_ == x.data_;} |
| 25 | bool operator< (const MoveOnly& x) const {return data_ < x.data_;} |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 26 | }; |
| 27 | |
| 28 | namespace std { |
| 29 | |
| 30 | template <> |
| 31 | struct hash<MoveOnly> |
| 32 | : public std::unary_function<MoveOnly, std::size_t> |
| 33 | { |
| 34 | std::size_t operator()(const MoveOnly& x) const {return x.get();} |
| 35 | }; |
| 36 | |
| 37 | } |
| 38 | |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 39 | #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 40 | |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 41 | #endif // MOVEONLY_H |