libcxx/test/libcxx/ranges/range.factories/range.istream.view/no_unique_address.compile.pass.cpp


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//===----------------------------------------------------------------------===//
//
// 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: no-localization
// UNSUPPORTED: c++03, c++11, c++14, c++17
// XFAIL: msvc && clang-17

// Test the libc++ extension that the value stored in `std::ranges::istream_view` has been marked
// as _LIBCPP_NO_UNIQUE_ADDRESS

#include <istream>
#include <ranges>

struct Empty {
  friend std::istream& operator>>(std::istream& i, Empty const&) { return i; }
};

static_assert(sizeof(std::ranges::istream_view<Empty>) == sizeof(void*));