libcxx/test/std/containers/sequences/vector/vector.modifiers/append_range.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, c++20
  10 // ADDITIONAL_COMPILE_FLAGS(has-fconstexpr-steps): -fconstexpr-steps=2000000
  11
  12 // template<container-compatible-range<T> R>
  13 //   constexpr void append_range(R&& rg); // C++23
  14
  15 #include <vector>
  16
  17 #include "../../insert_range_sequence_containers.h"
  18 #include "asan_testing.h"
  19 #include "test_macros.h"
  20
  21 // Tested cases:
  22 // - different kinds of insertions (appending an {empty/one-element/mid-sized/long range} into an
  23 //   {empty/one-element/full} container);
  24 // - appending move-only elements;
  25 // - an exception is thrown when copying the elements or when allocating new elements.
  26 constexpr bool test() {
  27   static_assert(test_constraints_append_range<std::vector, int, double>());
  28
  29   for_all_iterators_and_allocators<int, const int*>([]<class Iter, class Sent, class Alloc>() {
  30     test_sequence_append_range<std::vector<int, Alloc>, Iter, Sent>([]([[maybe_unused]] auto&& c) {
  31       LIBCPP_ASSERT(c.__invariants());
  32       LIBCPP_ASSERT(is_contiguous_container_asan_correct(c));
  33     });
  34   });
  35   test_sequence_append_range_move_only<std::vector>();
  36
  37   { // Vector may or may not need to reallocate because of the insertion -- make sure to test both cases.
  38     { // Ensure reallocation happens.
  39       int in[] = {-1, -2, -3, -4, -5, -6, -7, -8, -9, -10};
  40       std::vector<int> v = {1, 2, 3, 4, 5, 6, 7, 8};
  41       v.shrink_to_fit();
  42       assert(v.capacity() < v.size() + std::ranges::size(in));
  43
  44       v.append_range(in);
  45       assert(std::ranges::equal(v, std::array{1, 2, 3, 4, 5, 6, 7, 8, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10}));
  46     }
  47
  48     { // Ensure no reallocation happens.
  49       int in[] = {-1, -2, -3, -4, -5, -6, -7, -8, -9, -10};
  50       std::vector<int> v = {1, 2, 3, 4, 5, 6, 7, 8};
  51       v.reserve(v.size() + std::ranges::size(in));
  52       assert(v.capacity() >= v.size() + std::ranges::size(in));
  53
  54       v.append_range(in);
  55       assert(std::ranges::equal(v, std::array{1, 2, 3, 4, 5, 6, 7, 8, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10}));
  56     }
  57   }
  58
  59   return true;
  60 }
  61
  62 int main(int, char**) {
  63   test();
  64   static_assert(test());
  65
  66   test_append_range_exception_safety_throwing_copy<std::vector>();
  67   test_append_range_exception_safety_throwing_allocator<std::vector, int>();
  68
  69   return 0;
  70 }