libcxx/test/std/algorithms/algorithms.results/in_found_result.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 // template <class I>
  12 // struct in_found_result;
  13
  14 #include <algorithm>
  15 #include <cassert>
  16 #include <type_traits>
  17
  18 #include "MoveOnly.h"
  19
  20 struct A {
  21   explicit A(int);
  22 };
  23 // no implicit conversion
  24 static_assert(!std::is_constructible_v<std::ranges::in_found_result<A>, std::ranges::in_found_result<int>>);
  25
  26 struct B {
  27   B(const int&);
  28   B(int&&);
  29 };
  30 // implicit conversion
  31 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, std::ranges::in_found_result<int>>);
  32 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, std::ranges::in_found_result<int>&>);
  33 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, const std::ranges::in_found_result<int>>);
  34 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, const std::ranges::in_found_result<int>&>);
  35
  36 struct C {
  37   C(int&);
  38 };
  39 static_assert(!std::is_constructible_v<std::ranges::in_found_result<C>, std::ranges::in_found_result<int>&>);
  40
  41 // has to be convertible via const&
  42 static_assert(std::is_convertible_v<std::ranges::in_found_result<int>&, std::ranges::in_found_result<long>>);
  43 static_assert(std::is_convertible_v<const std::ranges::in_found_result<int>&, std::ranges::in_found_result<long>>);
  44 static_assert(std::is_convertible_v<std::ranges::in_found_result<int>&&, std::ranges::in_found_result<long>>);
  45 static_assert(std::is_convertible_v<const std::ranges::in_found_result<int>&&, std::ranges::in_found_result<long>>);
  46
  47 // should be move constructible
  48 static_assert(std::is_move_constructible_v<std::ranges::in_found_result<MoveOnly>>);
  49
  50 // should not be copy constructible
  51 static_assert(!std::is_copy_constructible_v<std::ranges::in_found_result<MoveOnly>>);
  52
  53 struct NotConvertible {};
  54 // conversions should not work if there is no conversion
  55 static_assert(!std::is_convertible_v<std::ranges::in_found_result<NotConvertible>, std::ranges::in_found_result<int>>);
  56
  57 static_assert(std::is_same_v<decltype(std::ranges::in_found_result<int>::in), int>);
  58 static_assert(std::is_same_v<decltype(std::ranges::in_found_result<int>::found), bool>);
  59
  60 template <class T>
  61 struct ConvertibleFrom {
  62   constexpr ConvertibleFrom(T c) : content{c} {}
  63   T content;
  64 };
  65
  66 constexpr bool test() {
  67   {
  68     std::ranges::in_found_result<double> res{10, true};
  69     assert(res.in == 10);
  70     assert(res.found == true);
  71     std::ranges::in_found_result<ConvertibleFrom<int>> res2 = res;
  72     assert(res2.in.content == 10);
  73     assert(res2.found == true);
  74   }
  75   {
  76     std::ranges::in_found_result<MoveOnly> res{MoveOnly{}, false};
  77     assert(res.in.get() == 1);
  78     assert(!res.found);
  79     auto res2 = std::move(res);
  80     assert(res2.in.get() == 1);
  81     assert(!res2.found);
  82     assert(res.in.get() == 0);
  83     assert(!res.found);
  84   }
  85   auto [in, found] = std::ranges::in_found_result<int>{2, false};
  86   assert(in == 2);
  87   assert(!found);
  88
  89   return true;
  90 }
  91
  92 int main(int, char**) {
  93   test();
  94   static_assert(test());
  95
  96   return 0;
  97 }