libcxx/test/std/containers/sequences/vector/vector.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 // <vector>
  10 // UNSUPPORTED: c++98, c++03, c++11, c++14
  11 // UNSUPPORTED: libcpp-no-deduction-guides
  12
  13
  14 // template <class InputIterator, class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>>
  15 //    deque(InputIterator, InputIterator, Allocator = Allocator())
  16 //    -> deque<typename iterator_traits<InputIterator>::value_type, Allocator>;
  17 //
  18
  19
  20 #include <vector>
  21 #include <iterator>
  22 #include <cassert>
  23 #include <cstddef>
  24 #include <climits> // INT_MAX
  25
  26 #include "test_macros.h"
  27 #include "test_iterators.h"
  28 #include "test_allocator.h"
  29
  30 struct A {};
  31
  32 int main(int, char**)
  33 {
  34
  35 //  Test the explicit deduction guides
  36     {
  37     const int arr[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
  38     std::vector vec(std::begin(arr), std::end(arr));
  39
  40     static_assert(std::is_same_v<decltype(vec), std::vector<int>>, "");
  41     assert(std::equal(vec.begin(), vec.end(), std::begin(arr), std::end(arr)));
  42     }
  43
  44     {
  45     const long arr[] = {INT_MAX, 1L, 2L, 3L };
  46     std::vector vec(std::begin(arr), std::end(arr), std::allocator<long>());
  47     static_assert(std::is_same_v<decltype(vec)::value_type, long>, "");
  48     assert(vec.size() == 4);
  49     assert(vec[0] == INT_MAX);
  50     assert(vec[1] == 1L);
  51     assert(vec[2] == 2L);
  52     }
  53
  54 //  Test the implicit deduction guides
  55
  56     {
  57 //  We don't expect this one to work.
  58 //  std::vector vec(std::allocator<int>()); // vector (allocator &)
  59     }
  60
  61     {
  62     std::vector vec(1, A{}); // vector (size_type, T)
  63     static_assert(std::is_same_v<decltype(vec)::value_type, A>, "");
  64     static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<A>>, "");
  65     assert(vec.size() == 1);
  66     }
  67
  68     {
  69     std::vector vec(1, A{}, test_allocator<A>()); // vector (size_type, T, allocator)
  70     static_assert(std::is_same_v<decltype(vec)::value_type, A>, "");
  71     static_assert(std::is_same_v<decltype(vec)::allocator_type, test_allocator<A>>, "");
  72     assert(vec.size() == 1);
  73     }
  74
  75     {
  76     std::vector vec{1U, 2U, 3U, 4U, 5U}; // vector(initializer-list)
  77     static_assert(std::is_same_v<decltype(vec)::value_type, unsigned>, "");
  78     assert(vec.size() == 5);
  79     assert(vec[2] == 3U);
  80     }
  81
  82     {
  83     std::vector vec({1.0, 2.0, 3.0, 4.0}, test_allocator<double>()); // vector(initializer-list, allocator)
  84     static_assert(std::is_same_v<decltype(vec)::value_type, double>, "");
  85     static_assert(std::is_same_v<decltype(vec)::allocator_type, test_allocator<double>>, "");
  86     assert(vec.size() == 4);
  87     assert(vec[3] == 4.0);
  88     }
  89
  90     {
  91     std::vector<long double> source;
  92     std::vector vec(source); // vector(vector &)
  93     static_assert(std::is_same_v<decltype(vec)::value_type, long double>, "");
  94     static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<long double>>, "");
  95     assert(vec.size() == 0);
  96     }
  97
  98
  99 //  A couple of vector<bool> tests, too!
 100     {
 101     std::vector vec(3, true); // vector(initializer-list)
 102     static_assert(std::is_same_v<decltype(vec)::value_type, bool>, "");
 103     static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<bool>>, "");
 104     assert(vec.size() == 3);
 105     assert(vec[0] && vec[1] && vec[2]);
 106     }
 107
 108     {
 109     std::vector<bool> source;
 110     std::vector vec(source); // vector(vector &)
 111     static_assert(std::is_same_v<decltype(vec)::value_type, bool>, "");
 112     static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<bool>>, "");
 113     assert(vec.size() == 0);
 114     }
 115
 116   return 0;
 117 }