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 // shared_ptr(shared_ptr&& r); 15 16 #include <memory> 17 #include <cassert> 18 19 struct A 20 { 21 static int count; 22 23 A() {++count;} 24 A(const A&) {++count;} 25 ~A() {--count;} 26 }; 27 28 int A::count = 0; 29 30 int main() 31 { 32 { 33 std::shared_ptr<A> pA(new A); 34 assert(pA.use_count() == 1); 35 assert(A::count == 1); 36 { 37 A* p = pA.get(); 38 std::shared_ptr<A> pA2(std::move(pA)); 39 assert(A::count == 1); 40 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 41 assert(pA.use_count() == 0); 42 assert(pA2.use_count() == 1); 43 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 44 assert(pA.use_count() == 2); 45 assert(pA2.use_count() == 2); 46 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 47 assert(pA2.get() == p); 48 } 49 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 50 assert(pA.use_count() == 0); 51 assert(A::count == 0); 52 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 53 assert(pA.use_count() == 1); 54 assert(A::count == 1); 55 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 56 } 57 assert(A::count == 0); 58 { 59 std::shared_ptr<A> pA; 60 assert(pA.use_count() == 0); 61 assert(A::count == 0); 62 { 63 std::shared_ptr<A> pA2(std::move(pA)); 64 assert(A::count == 0); 65 assert(pA.use_count() == 0); 66 assert(pA2.use_count() == 0); 67 assert(pA2.get() == pA.get()); 68 } 69 assert(pA.use_count() == 0); 70 assert(A::count == 0); 71 } 72 assert(A::count == 0); 73 } 74
