TheRock/math-libs/libhipcxx/.upstream-tests/test/cuda/numeric/overflow.arithmetic/overflow_result.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the libcu++ 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
// SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//

// MIT License
//
// Modifications Copyright (C) 2026 Advanced Micro Devices, Inc. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
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// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// SOFTWARE.

#include <cuda/numeric>
#include <cuda/std/cassert>
#include <cuda/std/cstddef>
#include <cuda/std/type_traits>

#include "test_macros.h"

template <class T>
__host__ __device__ constexpr void test_member(const T&)
{}

template <class T>
__host__ __device__ constexpr void test_type()
{
  // 1. Test properties of overflow_result
  {
    static_assert(cuda::std::is_standard_layout_v<cuda::overflow_result<T>>);
    static_assert(cuda::std::is_trivially_default_constructible_v<cuda::overflow_result<T>>);
    static_assert(cuda::std::is_trivially_copyable_v<cuda::overflow_result<T>>);
    static_assert(cuda::std::is_trivially_copy_assignable_v<cuda::overflow_result<T>>);
    static_assert(cuda::std::is_trivially_move_constructible_v<cuda::overflow_result<T>>);
    static_assert(cuda::std::is_trivially_move_assignable_v<cuda::overflow_result<T>>);
    static_assert(cuda::std::is_trivially_destructible_v<cuda::overflow_result<T>>);
  }

  // 2. Test members and member types
  {
    cuda::overflow_result<T> r{};
    test_member(r.value);
    test_member(r.overflow);

    static_assert(cuda::std::is_same_v<decltype(r.value), T>);
    static_assert(cuda::std::is_same_v<decltype(r.overflow), bool>);

#if TEST_COMPILER(NVRTC) || defined(TEST_COMPILER_HIPRTC)
    assert(offsetof(cuda::overflow_result<T>, value) == 0);
    assert(offsetof(cuda::overflow_result<T>, overflow) > offsetof(cuda::overflow_result<T>, value));
#else // ^^^ TEST_COMPILER(NVRTC) ^^^ / vvv !TEST_COMPILER(NVRTC) vvv
    static_assert(offsetof(cuda::overflow_result<T>, value) == 0);
    static_assert(offsetof(cuda::overflow_result<T>, overflow) > offsetof(cuda::overflow_result<T>, value));
#endif // !TEST_COMPILER(NVRTC)
  }

  // 3. Test explicit bool conversion
  {
    static_assert(!cuda::std::is_convertible_v<cuda::overflow_result<T>, bool>);

    cuda::overflow_result<T> r{};
    r.overflow = false;
    assert(static_cast<bool>(r) == r.overflow);
    r.overflow = true;
    assert(static_cast<bool>(r) == r.overflow);
  }

  // 4. Test structured bindings
#if __cpp_structured_bindings >= 201606L
  {
    const auto [value, overflow] = cuda::overflow_result<T>{T(1), true};
    assert(value == T(1));
    assert(overflow == true);
  }
#endif // __cpp_structured_bindings >= 201606L
}

__host__ __device__ constexpr bool test()
{
  test_type<signed char>();
  test_type<unsigned char>();
  test_type<short>();
  test_type<unsigned short>();
  test_type<int>();
  test_type<unsigned int>();
  test_type<long>();
  test_type<unsigned long>();
  test_type<long long>();
  test_type<unsigned long long>();
#if _CCCL_HAS_INT128()
  test_type<__int128_t>();
  test_type<__uint128_t>();
#endif // _CCCL_HAS_INT128()

  return true;
}

int main(int arg, char** argv)
{
  test();
  static_assert(test());
  return 0;
}