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Differential D135548 Diff 468702 libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/dynamic_pointer_cast.pass.cpp

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libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/dynamic_pointer_cast.pass.cpp

//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
// //
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information. // See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// //
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
// <memory> // <memory>
// shared_ptr // shared_ptr
// template<class T, class U> shared_ptr<T> dynamic_pointer_cast(const shared_ptr<U>& r); // template<class T, class U> shared_ptr<T> dynamic_pointer_cast(const shared_ptr<U>& r) noexcept;
// template<class T, class U> shared_ptr<T> dynamic_pointer_cast(shared_ptr<U>&& r) noexcept;
// UNSUPPORTED: no-rtti // UNSUPPORTED: no-rtti
#include <cassert>
#include <memory> #include <memory>
#include <type_traits> #include <type_traits>
#include <cassert> #include <utility>
#include "test_macros.h" #include "test_macros.h"
struct B struct B
{ {
static int count; static int count;
B() {++count;} B() {++count;}
Show All 14 Lines
}; };
int A::count = 0; int A::count = 0;
int main(int, char**) int main(int, char**)
{ {
{ {
const std::shared_ptr<B> pB(new A); const std::shared_ptr<B> pB(new A);
ASSERT_NOEXCEPT(std::dynamic_pointer_cast<A>(pB));
std::shared_ptr<A> pA = std::dynamic_pointer_cast<A>(pB); std::shared_ptr<A> pA = std::dynamic_pointer_cast<A>(pB);
assert(pA.get() == pB.get()); assert(pA.get() == pB.get());
assert(!pB.owner_before(pA) && !pA.owner_before(pB)); assert(!pB.owner_before(pA) && !pA.owner_before(pB));
} }
{ {
const std::shared_ptr<B> pB(new B); const std::shared_ptr<B> pB(new B);
std::shared_ptr<A> pA = std::dynamic_pointer_cast<A>(pB); std::shared_ptr<A> pA = std::dynamic_pointer_cast<A>(pB);
assert(pA.get() == 0); assert(pA.get() == 0);
assert(pA.use_count() == 0); assert(pA.use_count() == 0);
} }
#if TEST_STD_VER > 14 #if TEST_STD_VER > 14
{ {
const std::shared_ptr<B[8]> pB(new B[8]); const std::shared_ptr<B[8]> pB(new B[8]);
std::shared_ptr<A[8]> pA = std::dynamic_pointer_cast<A[8]>(pB); std::shared_ptr<A[8]> pA = std::dynamic_pointer_cast<A[8]>(pB);
assert(pA.get() == 0); assert(pA.get() == 0);
assert(pA.use_count() == 0); assert(pA.use_count() == 0);
} }
#endif // TEST_STD_VER > 14 #endif // TEST_STD_VER > 14
#if TEST_STD_VER > 20
{
A* pA_raw = new A;
std::shared_ptr<B> pB(pA_raw);
ASSERT_NOEXCEPT(std::dynamic_pointer_cast<A>(std::move(pB)));
std::shared_ptr<A> pA = std::dynamic_pointer_cast<A>(std::move(pB));
assert(pB.get() == nullptr);
assert(pA.get() == pA_raw);
assert(pA.use_count() == 1);
}
#endif // TEST_STD_VER > 20
return 0; return 0;
} }