weak_ptr.pass.cpp revision f5256e16dfc425c1d466f6308d4026d529ce9e0b
1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// <memory> 11 12// weak_ptr 13 14// weak_ptr(const weak_ptr& r); 15 16#include <memory> 17#include <type_traits> 18#include <cassert> 19 20struct B 21{ 22 static int count; 23 24 B() {++count;} 25 B(const B&) {++count;} 26 virtual ~B() {--count;} 27}; 28 29int B::count = 0; 30 31struct A 32 : public B 33{ 34 static int count; 35 36 A() {++count;} 37 A(const A&) {++count;} 38 ~A() {--count;} 39}; 40 41int A::count = 0; 42 43struct C 44{ 45 static int count; 46 47 C() {++count;} 48 C(const C&) {++count;} 49 virtual ~C() {--count;} 50}; 51 52int C::count = 0; 53 54int main() 55{ 56 { 57 const std::shared_ptr<A> ps(new A); 58 const std::weak_ptr<A> pA(ps); 59 assert(pA.use_count() == 1); 60 assert(B::count == 1); 61 assert(A::count == 1); 62 { 63 std::weak_ptr<A> pB(pA); 64 assert(B::count == 1); 65 assert(A::count == 1); 66 assert(pB.use_count() == 1); 67 assert(pA.use_count() == 1); 68 } 69 assert(pA.use_count() == 1); 70 assert(B::count == 1); 71 assert(A::count == 1); 72 } 73 assert(B::count == 0); 74 assert(A::count == 0); 75 { 76 std::weak_ptr<A> pA; 77 assert(pA.use_count() == 0); 78 assert(B::count == 0); 79 assert(A::count == 0); 80 { 81 std::weak_ptr<A> pB(pA); 82 assert(B::count == 0); 83 assert(A::count == 0); 84 assert(pB.use_count() == 0); 85 assert(pA.use_count() == 0); 86 } 87 assert(pA.use_count() == 0); 88 assert(B::count == 0); 89 assert(A::count == 0); 90 } 91 assert(B::count == 0); 92 assert(A::count == 0); 93} 94