test/std/utilities/meta/meta.trans/meta.trans.other/aligned_union.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
//
//===----------------------------------------------------------------------===//

// type_traits

// aligned_union<size_t Len, class ...Types>

//  Issue 3034 added:
//  The member typedef type shall be a trivial standard-layout type.

#include <type_traits>

#include "test_macros.h"

int main(int, char**)
{
    {
    typedef std::aligned_union<10, char >::type T1;
#if TEST_STD_VER > 11
    ASSERT_SAME_TYPE(T1, std::aligned_union_t<10, char>);
#endif
    static_assert(std::is_trivial<T1>::value, "");
    static_assert(std::is_standard_layout<T1>::value, "");
    static_assert(std::alignment_of<T1>::value == 1, "");
    static_assert(sizeof(T1) == 10, "");
    }
    {
    typedef std::aligned_union<10, short >::type T1;
#if TEST_STD_VER > 11
    ASSERT_SAME_TYPE(T1, std::aligned_union_t<10, short>);
#endif
    static_assert(std::is_trivial<T1>::value, "");
    static_assert(std::is_standard_layout<T1>::value, "");
    static_assert(std::alignment_of<T1>::value == 2, "");
    static_assert(sizeof(T1) == 10, "");
    }
    {
    typedef std::aligned_union<10, int >::type T1;
#if TEST_STD_VER > 11
    ASSERT_SAME_TYPE(T1, std::aligned_union_t<10, int>);
#endif
    static_assert(std::is_trivial<T1>::value, "");
    static_assert(std::is_standard_layout<T1>::value, "");
    static_assert(std::alignment_of<T1>::value == 4, "");
    static_assert(sizeof(T1) == 12, "");
    }
    {
    typedef std::aligned_union<10, double >::type T1;
#if TEST_STD_VER > 11
    ASSERT_SAME_TYPE(T1, std::aligned_union_t<10, double>);
#endif
    static_assert(std::is_trivial<T1>::value, "");
    static_assert(std::is_standard_layout<T1>::value, "");
    static_assert(std::alignment_of<T1>::value == 8, "");
    static_assert(sizeof(T1) == 16, "");
    }
    {
    typedef std::aligned_union<10, short, char >::type T1;
#if TEST_STD_VER > 11
    ASSERT_SAME_TYPE(T1, std::aligned_union_t<10, short, char>);
#endif
    static_assert(std::is_trivial<T1>::value, "");
    static_assert(std::is_standard_layout<T1>::value, "");
    static_assert(std::alignment_of<T1>::value == 2, "");
    static_assert(sizeof(T1) == 10, "");
    }
    {
    typedef std::aligned_union<10, char, short >::type T1;
#if TEST_STD_VER > 11
    ASSERT_SAME_TYPE(T1, std::aligned_union_t<10, char, short>);
#endif
    static_assert(std::is_trivial<T1>::value, "");
    static_assert(std::is_standard_layout<T1>::value, "");
    static_assert(std::alignment_of<T1>::value == 2, "");
    static_assert(sizeof(T1) == 10, "");
    }
    {
    typedef std::aligned_union<2, int, char, short >::type T1;
#if TEST_STD_VER > 11
    ASSERT_SAME_TYPE(T1, std::aligned_union_t<2, int, char, short>);
#endif
    static_assert(std::is_trivial<T1>::value, "");
    static_assert(std::is_standard_layout<T1>::value, "");
    static_assert(std::alignment_of<T1>::value == 4, "");
    static_assert(sizeof(T1) == 4, "");
    }
    {
    typedef std::aligned_union<2, char, int, short >::type T1;
#if TEST_STD_VER > 11
    ASSERT_SAME_TYPE(T1, std::aligned_union_t<2, char, int, short>);
#endif
    static_assert(std::is_trivial<T1>::value, "");
    static_assert(std::is_standard_layout<T1>::value, "");
    static_assert(std::alignment_of<T1>::value == 4, "");
    static_assert(sizeof(T1) == 4, "");
    }
    {
    typedef std::aligned_union<2, char, short, int >::type T1;
#if TEST_STD_VER > 11
    ASSERT_SAME_TYPE(T1, std::aligned_union_t<2, char, short, int>);
#endif
    static_assert(std::is_trivial<T1>::value, "");
    static_assert(std::is_standard_layout<T1>::value, "");
    static_assert(std::alignment_of<T1>::value == 4, "");
    static_assert(sizeof(T1) == 4, "");
    }

  return 0;
}