libcxx/test/std/containers/container.adaptors/stack/stack.cons/deduct.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 // <stack>
  10 // UNSUPPORTED: c++03, c++11, c++14
  11
  12 // template<class Container>
  13 //   stack(Container) -> stack<typename Container::value_type, Container>;
  14 //
  15 // template<class Container, class Allocator>
  16 //   stack(Container, Allocator) -> stack<typename Container::value_type, Container>;
  17 //
  18 // template<ranges::input_range R>
  19 //   stack(from_range_t, R&&) -> stack<ranges::range_value_t<R>>; // since C++23
  20 //
  21 // template<ranges::input_range R, class Allocator>
  22 //   stack(from_range_t, R&&, Allocator)
  23 //     -> stack<ranges::range_value_t<R>, deque<ranges::range_value_t<R>, Allocator>>; // since C++23
  24
  25 #include <array>
  26 #include <stack>
  27 #include <deque>
  28 #include <vector>
  29 #include <list>
  30 #include <iterator>
  31 #include <cassert>
  32 #include <cstddef>
  33 #include <climits> // INT_MAX
  34
  35 #include "deduction_guides_sfinae_checks.h"
  36 #include "test_macros.h"
  37 #include "test_iterators.h"
  38 #include "test_allocator.h"
  39
  40 struct A {};
  41
  42 int main(int, char**)
  43 {
  44
  45 //  Test the explicit deduction guides
  46     {
  47     std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
  48     std::stack stk(v);
  49
  50     static_assert(std::is_same_v<decltype(stk), std::stack<int, std::vector<int>>>, "");
  51     assert(stk.size() == v.size());
  52     assert(stk.top() == v.back());
  53     }
  54
  55     {
  56     std::list<long, test_allocator<long>> l{10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
  57     std::stack stk(l, test_allocator<long>(0,2)); // different allocator
  58     static_assert(std::is_same_v<decltype(stk)::container_type, std::list<long, test_allocator<long>>>, "");
  59     static_assert(std::is_same_v<decltype(stk)::value_type, long>, "");
  60     assert(stk.size() == 10);
  61     assert(stk.top() == 19);
  62 //  I'd like to assert that we've gotten the right allocator in the stack, but
  63 //  I don't know how to get at the underlying container.
  64     }
  65
  66 //  Test the implicit deduction guides
  67
  68     {
  69 //  We don't expect this one to work - no way to implicitly get value_type
  70 //  std::stack stk(std::allocator<int>()); // stack (allocator &)
  71     }
  72
  73     {
  74     std::stack<A> source;
  75     std::stack stk(source); // stack(stack &)
  76     static_assert(std::is_same_v<decltype(stk)::value_type, A>, "");
  77     static_assert(std::is_same_v<decltype(stk)::container_type, std::deque<A>>, "");
  78     assert(stk.size() == 0);
  79     }
  80
  81     {
  82         typedef short T;
  83         typedef test_allocator<T> Alloc;
  84         typedef std::list<T, Alloc> Cont;
  85         typedef test_allocator<int> ConvertibleToAlloc;
  86         static_assert(std::uses_allocator_v<Cont, ConvertibleToAlloc> &&
  87                       !std::is_same_v<typename Cont::allocator_type, ConvertibleToAlloc>);
  88
  89         {
  90         Cont cont;
  91         std::stack stk(cont, Alloc(2));
  92         static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
  93         }
  94
  95         {
  96         Cont cont;
  97         std::stack stk(cont, ConvertibleToAlloc(2));
  98         static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
  99         }
 100
 101         {
 102         Cont cont;
 103         std::stack stk(std::move(cont), Alloc(2));
 104         static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
 105         }
 106
 107         {
 108         Cont cont;
 109         std::stack stk(std::move(cont), ConvertibleToAlloc(2));
 110         static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
 111         }
 112     }
 113
 114     {
 115         typedef short T;
 116         typedef test_allocator<T> Alloc;
 117         typedef std::list<T, Alloc> Cont;
 118         typedef test_allocator<int> ConvertibleToAlloc;
 119         static_assert(std::uses_allocator_v<Cont, ConvertibleToAlloc> &&
 120                       !std::is_same_v<typename Cont::allocator_type, ConvertibleToAlloc>);
 121
 122         {
 123         std::stack<T, Cont> source;
 124         std::stack stk(source, Alloc(2));
 125         static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
 126         }
 127
 128         {
 129         std::stack<T, Cont> source;
 130         std::stack stk(source, ConvertibleToAlloc(2));
 131         static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
 132         }
 133
 134         {
 135         std::stack<T, Cont> source;
 136         std::stack stk(std::move(source), Alloc(2));
 137         static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
 138         }
 139
 140         {
 141         std::stack<T, Cont> source;
 142         std::stack stk(std::move(source), ConvertibleToAlloc(2));
 143         static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
 144         }
 145     }
 146
 147 #if TEST_STD_VER >= 23
 148     {
 149         typedef short T;
 150         typedef test_allocator<T> Alloc;
 151         std::list<T> a;
 152         {
 153         std::stack s(a.begin(), a.end());
 154         static_assert(std::is_same_v<decltype(s), std::stack<T>>);
 155         }
 156         {
 157         std::stack s(a.begin(), a.end(), Alloc());
 158         static_assert(std::is_same_v<decltype(s), std::stack<T, std::deque<T, Alloc>>>);
 159         }
 160     }
 161
 162     {
 163       {
 164         std::stack c(std::from_range, std::array<int, 0>());
 165         static_assert(std::is_same_v<decltype(c), std::stack<int>>);
 166       }
 167
 168       {
 169         using Alloc = test_allocator<int>;
 170         std::stack c(std::from_range, std::array<int, 0>(), Alloc());
 171         static_assert(std::is_same_v<decltype(c), std::stack<int, std::deque<int, Alloc>>>);
 172       }
 173     }
 174 #endif
 175
 176     ContainerAdaptorDeductionGuidesSfinaeAway<std::stack, std::stack<int>>();
 177
 178     return 0;
 179 }