1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef MOVEONLY_H 11 #define MOVEONLY_H 12 13 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 14 15 #include <cstddef> 16 #include <functional> 17 18 class MoveOnly 19 { 20 MoveOnly(const MoveOnly&); 21 MoveOnly& operator=(const MoveOnly&); 22 23 int data_; 24 public: 25 MoveOnly(int data = 1) : data_(data) {} 26 MoveOnly(MoveOnly&& x) 27 : data_(x.data_) {x.data_ = 0;} 28 MoveOnly& operator=(MoveOnly&& x) 29 {data_ = x.data_; x.data_ = 0; return *this;} 30 31 int get() const {return data_;} 32 33 bool operator==(const MoveOnly& x) const {return data_ == x.data_;} 34 bool operator< (const MoveOnly& x) const {return data_ < x.data_;} 35 }; 36 37 namespace std { 38 39 template <> 40 struct hash<MoveOnly> 41 : public std::unary_function<MoveOnly, std::size_t> 42 { 43 std::size_t operator()(const MoveOnly& x) const {return x.get();} 44 }; 45 46 } 47 48 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 49 50 #endif // MOVEONLY_H 51
