libcxx/test/std/algorithms/algorithms.results/no_unique_address.compile.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10
  11 // clang-cl and cl currently don't support [[no_unique_address]]
  12 // XFAIL: msvc
  13
  14 // [algorithms.results]/1
  15 //   Each of the class templates specified in this subclause has the template parameters,
  16 //   data members, and special members specified below, and has no base classes or members
  17 //   other than those specified.
  18
  19 #include <algorithm>
  20
  21 #include "test_macros.h"
  22
  23 struct Empty {};
  24 struct Empty2 {};
  25
  26 static_assert(sizeof(std::ranges::in_fun_result<Empty, int>) == sizeof(int));
  27 static_assert(sizeof(std::ranges::in_fun_result<int, Empty>) == sizeof(int));
  28 static_assert(sizeof(std::ranges::in_fun_result<Empty, Empty>) == 2);
  29
  30 static_assert(sizeof(std::ranges::in_in_result<Empty, int>) == sizeof(int));
  31 static_assert(sizeof(std::ranges::in_in_result<int, Empty>) == sizeof(int));
  32 static_assert(sizeof(std::ranges::in_in_result<Empty, Empty>) == 2);
  33
  34 static_assert(sizeof(std::ranges::in_out_result<Empty, int>) == sizeof(int));
  35 static_assert(sizeof(std::ranges::in_out_result<int, Empty>) == sizeof(int));
  36 static_assert(sizeof(std::ranges::in_out_result<Empty, Empty2>) == sizeof(char));
  37
  38 static_assert(sizeof(std::ranges::in_in_out_result<Empty, int, int>) == 2 * sizeof(int));
  39 static_assert(sizeof(std::ranges::in_in_out_result<int, Empty, int>) == 2 * sizeof(int));
  40 static_assert(sizeof(std::ranges::in_in_out_result<int, int, Empty>) == 2 * sizeof(int));
  41 static_assert(sizeof(std::ranges::in_in_out_result<char, Empty, Empty>) == 2);
  42 static_assert(sizeof(std::ranges::in_in_out_result<Empty, char, Empty>) == 2);
  43 static_assert(sizeof(std::ranges::in_in_out_result<Empty, Empty, char>) == 2);
  44 static_assert(sizeof(std::ranges::in_in_out_result<int, Empty, Empty2>) == sizeof(int));
  45 static_assert(sizeof(std::ranges::in_in_out_result<Empty, Empty, Empty>) == 3);
  46
  47 static_assert(sizeof(std::ranges::in_out_out_result<Empty, int, int>) == 2 * sizeof(int));
  48 static_assert(sizeof(std::ranges::in_out_out_result<int, Empty, int>) == 2 * sizeof(int));
  49 static_assert(sizeof(std::ranges::in_out_out_result<int, int, Empty>) == 2 * sizeof(int));
  50 static_assert(sizeof(std::ranges::in_out_out_result<char, Empty, Empty>) == 2);
  51 static_assert(sizeof(std::ranges::in_out_out_result<Empty, char, Empty>) == 2);
  52 static_assert(sizeof(std::ranges::in_out_out_result<Empty, Empty, char>) == 2);
  53 static_assert(sizeof(std::ranges::in_out_out_result<int, Empty, Empty2>) == sizeof(int));
  54 static_assert(sizeof(std::ranges::in_out_out_result<Empty, Empty, Empty>) == 3);
  55
  56 // In min_max_result both elements have the same type, so they can't have the same address.
  57 // So the only way to test that [[no_unique_address]] is used is to have it in another struct
  58 struct MinMaxNoUniqueAddress {
  59   int a;
  60   TEST_NO_UNIQUE_ADDRESS std::ranges::min_max_result<Empty> b;
  61   int c;
  62 };
  63
  64 static_assert(sizeof(std::ranges::min_max_result<Empty>) == 2);
  65 static_assert(sizeof(MinMaxNoUniqueAddress) == 8);
  66
  67 static_assert(sizeof(std::ranges::in_found_result<Empty>) == sizeof(bool));