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(const 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 std::shared_ptr<A> pA2(pA); 38 assert(A::count == 1); 39 assert(pA.use_count() == 2); 40 assert(pA2.use_count() == 2); 41 assert(pA2.get() == pA.get()); 42 } 43 assert(pA.use_count() == 1); 44 assert(A::count == 1); 45 } 46 assert(A::count == 0); 47 { 48 std::shared_ptr<A> pA; 49 assert(pA.use_count() == 0); 50 assert(A::count == 0); 51 { 52 std::shared_ptr<A> pA2(pA); 53 assert(A::count == 0); 54 assert(pA.use_count() == 0); 55 assert(pA2.use_count() == 0); 56 assert(pA2.get() == pA.get()); 57 } 58 assert(pA.use_count() == 0); 59 assert(A::count == 0); 60 } 61 assert(A::count == 0); 62 } 63
