llvm/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03

// Self assignment post-conditions are tested.
// ADDITIONAL_COMPILE_FLAGS(gcc-style-warnings): -Wno-self-move

// <memory>

// unique_ptr

// Test unique_ptr move assignment

// test move assignment.  Should only require a MoveConstructible deleter, or if
//    deleter is a reference, not even that.

#include <memory>
#include <utility>
#include <cassert>

#include "test_macros.h"
#include "deleter_types.h"
#include "unique_ptr_test_helper.h"

struct GenericDeleter {
  void operator()(void*) const;
};

template <bool IsArray>
TEST_CONSTEXPR_CXX23 void test_basic() {
  typedef typename std::conditional<IsArray, A[], A>::type VT;
  const int expect_alive = IsArray ? 5 : 1;
  {
    std::unique_ptr<VT> s1(newValue<VT>(expect_alive));
    A* p = s1.get();
    std::unique_ptr<VT> s2(newValue<VT>(expect_alive));
    if (!TEST_IS_CONSTANT_EVALUATED)
      assert(A::count == (expect_alive * 2));
    s2 = std::move(s1);
    if (!TEST_IS_CONSTANT_EVALUATED)
      assert(A::count == expect_alive);
    assert(s2.get() == p);
    assert(s1.get() == 0);
  }
  if (!TEST_IS_CONSTANT_EVALUATED)
    assert(A::count == 0);
  {
    std::unique_ptr<VT, Deleter<VT> > s1(newValue<VT>(expect_alive),
                                         Deleter<VT>(5));
    A* p = s1.get();
    std::unique_ptr<VT, Deleter<VT> > s2(newValue<VT>(expect_alive));
    if (!TEST_IS_CONSTANT_EVALUATED)
      assert(A::count == (expect_alive * 2));
    s2 = std::move(s1);
    assert(s2.get() == p);
    assert(s1.get() == 0);
    if (!TEST_IS_CONSTANT_EVALUATED)
      assert(A::count == expect_alive);
    assert(s2.get_deleter().state() == 5);
    assert(s1.get_deleter().state() == 0);
  }
  if (!TEST_IS_CONSTANT_EVALUATED)
    assert(A::count == 0);
  {
    CDeleter<VT> d1(5);
    std::unique_ptr<VT, CDeleter<VT>&> s1(newValue<VT>(expect_alive), d1);
    A* p = s1.get();
    CDeleter<VT> d2(6);
    std::unique_ptr<VT, CDeleter<VT>&> s2(newValue<VT>(expect_alive), d2);
    s2 = std::move(s1);
    assert(s2.get() == p);
    assert(s1.get() == 0);
    if (!TEST_IS_CONSTANT_EVALUATED)
      assert(A::count == expect_alive);
    assert(d1.state() == 5);
    assert(d2.state() == 5);
  }
  if (!TEST_IS_CONSTANT_EVALUATED)
    assert(A::count == 0);
  {
    std::unique_ptr<VT> s(newValue<VT>(expect_alive));
    A* p = s.get();
    s = std::move(s);
    if (!TEST_IS_CONSTANT_EVALUATED)
      assert(A::count == expect_alive);
    assert(s.get() == p);
  }
  if (!TEST_IS_CONSTANT_EVALUATED)
    assert(A::count == 0);
}

template <bool IsArray>
TEST_CONSTEXPR_CXX23 void test_sfinae() {
  typedef typename std::conditional<IsArray, int[], int>::type VT;
  {
    typedef std::unique_ptr<VT> U;
    static_assert(!std::is_assignable<U, U&>::value, "");
    static_assert(!std::is_assignable<U, const U&>::value, "");
    static_assert(!std::is_assignable<U, const U&&>::value, "");
    static_assert(std::is_nothrow_assignable<U, U&&>::value, "");
  }
  {
    typedef std::unique_ptr<VT, GenericDeleter> U;
    static_assert(!std::is_assignable<U, U&>::value, "");
    static_assert(!std::is_assignable<U, const U&>::value, "");
    static_assert(!std::is_assignable<U, const U&&>::value, "");
    static_assert(std::is_nothrow_assignable<U, U&&>::value, "");
  }
  {
    typedef std::unique_ptr<VT, NCDeleter<VT>&> U;
    static_assert(!std::is_assignable<U, U&>::value, "");
    static_assert(!std::is_assignable<U, const U&>::value, "");
    static_assert(!std::is_assignable<U, const U&&>::value, "");
    static_assert(std::is_nothrow_assignable<U, U&&>::value, "");
  }
  {
    typedef std::unique_ptr<VT, const NCDeleter<VT>&> U;
    static_assert(!std::is_assignable<U, U&>::value, "");
    static_assert(!std::is_assignable<U, const U&>::value, "");
    static_assert(!std::is_assignable<U, const U&&>::value, "");
    static_assert(std::is_nothrow_assignable<U, U&&>::value, "");
  }
}

TEST_CONSTEXPR_CXX23 bool test() {
  {
    test_basic</*IsArray*/ false>();
    test_sfinae<false>();
  }
  {
    test_basic</*IsArray*/ true>();
    test_sfinae<true>();
  }

  return true;
}

int main(int, char**) {
  test();
#if TEST_STD_VER >= 23
  static_assert(test());
#endif

  return 0;
}