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 // <memory> 11 12 // shared_ptr 13 14 // Example move-only deleter 15 16 #ifndef DELETER_H 17 #define DELETER_H 18 19 #include <type_traits> 20 #include <cassert> 21 22 struct test_deleter_base 23 { 24 static int count; 25 static int dealloc_count; 26 }; 27 28 int test_deleter_base::count = 0; 29 int test_deleter_base::dealloc_count = 0; 30 31 template <class T> 32 class test_deleter 33 : public test_deleter_base 34 { 35 int state_; 36 37 public: 38 test_deleter()39 test_deleter() : state_(0) {++count;} test_deleter(int s)40 explicit test_deleter(int s) : state_(s) {++count;} test_deleter(const test_deleter & d)41 test_deleter(const test_deleter& d) 42 : state_(d.state_) {++count;} ~test_deleter()43 ~test_deleter() {assert(state_ >= 0); --count; state_ = -1;} 44 state()45 int state() const {return state_;} set_state(int i)46 void set_state(int i) {state_ = i;} 47 operator()48 void operator()(T* p) {assert(state_ >= 0); ++dealloc_count; delete p;} 49 }; 50 51 template <class T> 52 void swap(test_deleter<T> & x,test_deleter<T> & y)53swap(test_deleter<T>& x, test_deleter<T>& y) 54 { 55 test_deleter<T> t(std::move(x)); 56 x = std::move(y); 57 y = std::move(t); 58 } 59 60 #endif // DELETER_H 61