libcxx/test/std/algorithms/algorithms.results/min_max_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 I1, class I2>
  12 // struct min_max_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::min_max_result<A>, std::ranges::min_max_result<int>>);
  25
  26 struct B {
  27   B(int);
  28 };
  29 // implicit conversion
  30 static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, std::ranges::min_max_result<int>>);
  31 static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, std::ranges::min_max_result<int>&>);
  32 static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, const std::ranges::min_max_result<int>>);
  33 static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, const std::ranges::min_max_result<int>&>);
  34
  35 struct C {
  36   C(int&);
  37 };
  38 static_assert(!std::is_constructible_v<std::ranges::min_max_result<C>, std::ranges::min_max_result<int>&>);
  39
  40 // has to be convertible via const&
  41 static_assert(std::is_convertible_v<std::ranges::min_max_result<int>&, std::ranges::min_max_result<long>>);
  42 static_assert(std::is_convertible_v<const std::ranges::min_max_result<int>&, std::ranges::min_max_result<long>>);
  43 static_assert(std::is_convertible_v<std::ranges::min_max_result<int>&&, std::ranges::min_max_result<long>>);
  44 static_assert(std::is_convertible_v<const std::ranges::min_max_result<int>&&, std::ranges::min_max_result<long>>);
  45
  46 // should be move constructible
  47 static_assert(std::is_move_constructible_v<std::ranges::min_max_result<MoveOnly>>);
  48
  49 // should not be copy constructible
  50 static_assert(!std::is_copy_constructible_v<std::ranges::min_max_result<MoveOnly>>);
  51
  52 struct NotConvertible {};
  53 // conversions should not work if there is no conversion
  54 static_assert(!std::is_convertible_v<std::ranges::min_max_result<NotConvertible>, std::ranges::min_max_result<int>>);
  55
  56 template <class T>
  57 struct ConvertibleFrom {
  58   constexpr ConvertibleFrom(T c) : content{c} {}
  59   T content;
  60 };
  61
  62 constexpr bool test() {
  63   {
  64     std::ranges::min_max_result<double> res{10, 1};
  65     assert(res.min == 10);
  66     assert(res.max == 1);
  67     std::ranges::min_max_result<ConvertibleFrom<int>> res2 = res;
  68     assert(res2.min.content == 10);
  69     assert(res2.max.content == 1);
  70   }
  71   {
  72     std::ranges::min_max_result<MoveOnly> res{MoveOnly{}, MoveOnly{}};
  73     assert(res.min.get() == 1);
  74     assert(res.max.get() == 1);
  75     auto res2 = std::move(res);
  76     assert(res.min.get() == 0);
  77     assert(res.max.get() == 0);
  78     assert(res2.min.get() == 1);
  79     assert(res2.max.get() == 1);
  80   }
  81   {
  82     auto [min, max] = std::ranges::min_max_result<int>{1, 2};
  83     assert(min == 1);
  84     assert(max == 2);
  85   }
  86
  87   return true;
  88 }
  89
  90 int main(int, char**) {
  91   test();
  92   static_assert(test());
  93
  94   return 0;
  95 }