| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| |
| // <memory> |
| |
| // template <nothrow-forward-iterator ForwardIterator, class T> |
| // requires constructible_from<iter_value_t<ForwardIterator>, const T&> |
| // ForwardIterator ranges::uninitialized_fill_n(ForwardIterator first, iter_difference_t<ForwardIterator> n); |
| |
| #include <algorithm> |
| #include <cassert> |
| #include <iterator> |
| #include <memory> |
| #include <ranges> |
| #include <type_traits> |
| |
| #include "../buffer.h" |
| #include "../counted.h" |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| // TODO(varconst): consolidate the ADL checks into a single file. |
| // Because this is a variable and not a function, it's guaranteed that ADL won't be used. However, |
| // implementations are allowed to use a different mechanism to achieve this effect, so this check is |
| // libc++-specific. |
| LIBCPP_STATIC_ASSERT(std::is_class_v<decltype(std::ranges::uninitialized_fill_n)>); |
| |
| struct NotConvertibleFromInt {}; |
| static_assert(!std::is_invocable_v<decltype(std::ranges::uninitialized_fill_n), NotConvertibleFromInt*, std::size_t, int>); |
| |
| int main(int, char**) { |
| constexpr int value = 42; |
| Counted x(value); |
| Counted::reset(); |
| auto pred = [](const Counted& e) { return e.value == value; }; |
| |
| // An empty range -- no default constructors should be invoked. |
| { |
| Buffer<Counted, 1> buf; |
| |
| std::ranges::uninitialized_fill_n(buf.begin(), 0, x); |
| assert(Counted::current_objects == 0); |
| assert(Counted::total_objects == 0); |
| } |
| |
| // A range containing several objects. |
| { |
| constexpr int N = 5; |
| Buffer<Counted, N> buf; |
| |
| std::ranges::uninitialized_fill_n(buf.begin(), N, x); |
| assert(Counted::current_objects == N); |
| assert(Counted::total_objects == N); |
| assert(std::all_of(buf.begin(), buf.end(), pred)); |
| |
| std::destroy(buf.begin(), buf.end()); |
| Counted::reset(); |
| } |
| |
| // Any existing values should be overwritten by value constructors. |
| { |
| constexpr int N = 5; |
| int buffer[N] = {value, value, value, value, value}; |
| |
| std::ranges::uninitialized_fill_n(buffer, 1, 0); |
| assert(buffer[0] == 0); |
| assert(buffer[1] == value); |
| |
| std::ranges::uninitialized_fill_n(buffer, N, 0); |
| assert(buffer[0] == 0); |
| assert(buffer[1] == 0); |
| assert(buffer[2] == 0); |
| assert(buffer[3] == 0); |
| assert(buffer[4] == 0); |
| } |
| |
| // An exception is thrown while objects are being created -- the existing objects should stay |
| // valid. (iterator, sentinel) overload. |
| #ifndef TEST_HAS_NO_EXCEPTIONS |
| { |
| constexpr int N = 5; |
| Buffer<Counted, N> buf; |
| |
| Counted::throw_on = 3; // When constructing the fourth object. |
| try { |
| std::ranges::uninitialized_fill_n(buf.begin(), N, x); |
| } catch (...) { |
| } |
| assert(Counted::current_objects == 0); |
| assert(Counted::total_objects == 3); |
| |
| std::destroy(buf.begin(), buf.begin() + 3); |
| Counted::reset(); |
| } |
| #endif // TEST_HAS_NO_EXCEPTIONS |
| |
| // Works with const iterators. |
| { |
| constexpr int N = 5; |
| Buffer<Counted, N> buf; |
| |
| std::ranges::uninitialized_fill_n(buf.cbegin(), N, x); |
| assert(Counted::current_objects == N); |
| assert(Counted::total_objects == N); |
| assert(std::all_of(buf.begin(), buf.end(), pred)); |
| |
| std::destroy(buf.begin(), buf.end()); |
| Counted::reset(); |
| } |
| |
| return 0; |
| } |