| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <memory> |
| |
| // shared_ptr |
| |
| // template<class T, class U> shared_ptr<T> const_pointer_cast(const shared_ptr<U>& r); |
| |
| #include <memory> |
| #include <type_traits> |
| #include <cassert> |
| |
| struct B |
| { |
| static int count; |
| |
| B() {++count;} |
| B(const B&) {++count;} |
| virtual ~B() {--count;} |
| }; |
| |
| int B::count = 0; |
| |
| struct A |
| : public B |
| { |
| static int count; |
| |
| A() {++count;} |
| A(const A&) {++count;} |
| ~A() {--count;} |
| }; |
| |
| int A::count = 0; |
| |
| int main() |
| { |
| { |
| const std::shared_ptr<const A> pA(new A); |
| std::shared_ptr<A> pB = std::const_pointer_cast<A>(pA); |
| assert(pB.get() == pA.get()); |
| assert(!pB.owner_before(pA) && !pA.owner_before(pB)); |
| } |
| { |
| const std::shared_ptr<const A> pA; |
| std::shared_ptr<A> pB = std::const_pointer_cast<A>(pA); |
| assert(pB.get() == pA.get()); |
| assert(!pB.owner_before(pA) && !pA.owner_before(pB)); |
| } |
| } |