| 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 |
| 10 | |
| 11 | // <memory> |
| 12 | |
| 13 | // template <class ForwardIt> |
| 14 | // void uninitialized_default_construct(ForwardIt, ForwardIt); |
| 15 | |
| 16 | #include <memory> |
| 17 | #include <cstdlib> |
| 18 | #include <cassert> |
| 19 | |
| 20 | #include "test_macros.h" |
| 21 | #include "test_iterators.h" |
| 22 | |
| 23 | struct Counted { |
| 24 | static int count; |
| 25 | static int constructed; |
| 26 | static void reset() { count = constructed = 0; } |
| 27 | explicit Counted() { ++count; ++constructed; } |
| 28 | Counted(Counted const&) { assert(false); } |
| 29 | ~Counted() { assert(count > 0); --count; } |
| 30 | friend void operator&(Counted) = delete; |
| 31 | }; |
| 32 | int Counted::count = 0; |
| 33 | int Counted::constructed = 0; |
| 34 | |
| 35 | |
| 36 | struct ThrowsCounted { |
| 37 | static int count; |
| 38 | static int constructed; |
| 39 | static int throw_after; |
| 40 | static void reset() { throw_after = count = constructed = 0; } |
| 41 | explicit ThrowsCounted() { |
| 42 | ++constructed; |
| 43 | if (throw_after > 0 && --throw_after == 0) { |
| 44 | TEST_THROW(1); |
| 45 | } |
| 46 | ++count; |
| 47 | } |
| 48 | ThrowsCounted(ThrowsCounted const&) { assert(false); } |
| 49 | ~ThrowsCounted() { assert(count > 0); --count; } |
| 50 | friend void operator&(ThrowsCounted) = delete; |
| 51 | }; |
| 52 | int ThrowsCounted::count = 0; |
| 53 | int ThrowsCounted::constructed = 0; |
| 54 | int ThrowsCounted::throw_after = 0; |
| 55 | |
| 56 | void test_ctor_throws() |
| 57 | { |
| 58 | #ifndef TEST_HAS_NO_EXCEPTIONS |
| 59 | using It = forward_iterator<ThrowsCounted*>; |
| 60 | const int N = 5; |
| 61 | alignas(ThrowsCounted) char pool[sizeof(ThrowsCounted)*N] = {}; |
| 62 | ThrowsCounted* p = (ThrowsCounted*)pool; |
| 63 | try { |
| 64 | ThrowsCounted::throw_after = 4; |
| 65 | std::uninitialized_default_construct_n(It(p), N); |
| 66 | assert(false); |
| 67 | } catch (...) {} |
| 68 | assert(ThrowsCounted::count == 0); |
| 69 | assert(ThrowsCounted::constructed == 4); // Fourth construction throws |
| 70 | #endif |
| 71 | } |
| 72 | |
| 73 | void test_counted() |
| 74 | { |
| 75 | using It = forward_iterator<Counted*>; |
| 76 | const int N = 5; |
| 77 | alignas(Counted) char pool[sizeof(Counted)*N] = {}; |
| 78 | Counted* p = (Counted*)pool; |
| 79 | It e = std::uninitialized_default_construct_n(It(p), 1); |
| 80 | assert(e == It(p+1)); |
| 81 | assert(Counted::count == 1); |
| 82 | assert(Counted::constructed == 1); |
| 83 | e = std::uninitialized_default_construct_n(It(p+1), 4); |
| 84 | assert(e == It(p+N)); |
| 85 | assert(Counted::count == 5); |
| 86 | assert(Counted::constructed == 5); |
| 87 | std::destroy(first: p, last: p+N); |
| 88 | assert(Counted::count == 0); |
| 89 | } |
| 90 | |
| 91 | int main(int, char**) |
| 92 | { |
| 93 | test_counted(); |
| 94 | test_ctor_throws(); |
| 95 | |
| 96 | return 0; |
| 97 | } |
| 98 |