libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace_extra.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
  10
  11 // <vector>
  12
  13 // template <class... Args> iterator emplace(const_iterator pos, Args&&... args);
  14
  15 #include <vector>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19 #include "min_allocator.h"
  20 #include "asan_testing.h"
  21
  22 TEST_CONSTEXPR_CXX20 bool tests() {
  23     {
  24         std::vector<int> v;
  25         v.reserve(3);
  26         assert(is_contiguous_container_asan_correct(v));
  27         v = { 1, 2, 3 };
  28         v.emplace(v.begin(), v.back());
  29         assert(v[0] == 3);
  30         assert(is_contiguous_container_asan_correct(v));
  31     }
  32     {
  33         std::vector<int> v;
  34         v.reserve(4);
  35         assert(is_contiguous_container_asan_correct(v));
  36         v = { 1, 2, 3 };
  37         v.emplace(v.begin(), v.back());
  38         assert(v[0] == 3);
  39         assert(is_contiguous_container_asan_correct(v));
  40     }
  41     {
  42         std::vector<int, min_allocator<int>> v;
  43         v.reserve(3);
  44         assert(is_contiguous_container_asan_correct(v));
  45         v = { 1, 2, 3 };
  46         v.emplace(v.begin(), v.back());
  47         assert(v[0] == 3);
  48         assert(is_contiguous_container_asan_correct(v));
  49     }
  50     {
  51         std::vector<int, min_allocator<int>> v;
  52         v.reserve(4);
  53         assert(is_contiguous_container_asan_correct(v));
  54         v = { 1, 2, 3 };
  55         v.emplace(v.begin(), v.back());
  56         assert(v[0] == 3);
  57         assert(is_contiguous_container_asan_correct(v));
  58     }
  59     {
  60       std::vector<int, safe_allocator<int>> v;
  61       v.reserve(3);
  62       assert(is_contiguous_container_asan_correct(v));
  63       v = {1, 2, 3};
  64       v.emplace(v.begin(), v.back());
  65       assert(v[0] == 3);
  66       assert(is_contiguous_container_asan_correct(v));
  67     }
  68     {
  69       std::vector<int, safe_allocator<int>> v;
  70       v.reserve(4);
  71       assert(is_contiguous_container_asan_correct(v));
  72       v = {1, 2, 3};
  73       v.emplace(v.begin(), v.back());
  74       assert(v[0] == 3);
  75       assert(is_contiguous_container_asan_correct(v));
  76     }
  77     {
  78         std::vector<int> v;
  79         v.reserve(8);
  80         std::size_t old_capacity = v.capacity();
  81         assert(old_capacity >= 8);
  82
  83         v.resize(4); // keep the existing capacity
  84         assert(v.capacity() == old_capacity);
  85
  86         v.emplace(v.cend(), 42);
  87         assert(v.size() == 5);
  88         assert(v.capacity() == old_capacity);
  89         assert(v[4] == 42);
  90     }
  91
  92     return true;
  93 }
  94
  95 int main(int, char**) {
  96     tests();
  97 #if TEST_STD_VER > 17
  98     static_assert(tests());
  99 #endif
 100     return 0;
 101 }