third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/get_deleter.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
//
//===----------------------------------------------------------------------===//

// <memory>

// unique_ptr

// test get_deleter()

#include <memory>
#include <cassert>
#include <type_traits>

#include "test_macros.h"

struct Deleter {
  TEST_CONSTEXPR_CXX23 Deleter() {}

  TEST_CONSTEXPR_CXX23 void operator()(void*) const {}

  TEST_CONSTEXPR_CXX23 int test() { return 5; }
  TEST_CONSTEXPR_CXX23 int test() const { return 6; }
};

template <bool IsArray>
TEST_CONSTEXPR_CXX23 void test_basic() {
  typedef typename std::conditional<IsArray, int[], int>::type VT;
  {
    std::unique_ptr<int, Deleter> p;
    assert(p.get_deleter().test() == 5);
  }
  {
    const std::unique_ptr<VT, Deleter> p;
    assert(p.get_deleter().test() == 6);
  }
  {
    typedef std::unique_ptr<VT, const Deleter&> UPtr;
    const Deleter d;
    UPtr p(nullptr, d);
    const UPtr& cp = p;
    ASSERT_SAME_TYPE(decltype(p.get_deleter()), const Deleter&);
    ASSERT_SAME_TYPE(decltype(cp.get_deleter()), const Deleter&);
    assert(p.get_deleter().test() == 6);
    assert(cp.get_deleter().test() == 6);
  }
  {
    typedef std::unique_ptr<VT, Deleter&> UPtr;
    Deleter d;
    UPtr p(nullptr, d);
    const UPtr& cp = p;
    ASSERT_SAME_TYPE(decltype(p.get_deleter()), Deleter&);
    ASSERT_SAME_TYPE(decltype(cp.get_deleter()), Deleter&);
    assert(p.get_deleter().test() == 5);
    assert(cp.get_deleter().test() == 5);
  }
}

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

  return true;
}

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

  return 0;
}