107 lines
3.1 KiB
C++
107 lines
3.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <algorithm>
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// template<ForwardIterator Iter, class T>
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// requires OutputIterator<Iter, const T&>
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// constexpr void // constexpr after C++17
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// fill(Iter first, Iter last, const T& value);
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#include <algorithm>
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#include <array>
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#include <cassert>
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#include <cstddef>
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#include <vector>
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#include "test_macros.h"
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#include "test_iterators.h"
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template <class Iter, class Container>
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TEST_CONSTEXPR_CXX20 void
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test(Container in, size_t from, size_t to, typename Container::value_type value, Container expected) {
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std::fill(Iter(in.data() + from), Iter(in.data() + to), value);
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assert(in == expected);
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}
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template <class T>
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struct Test {
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template <class Iter>
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TEST_CONSTEXPR_CXX20 void operator()() {
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{
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std::array<T, 4> in = {1, 2, 3, 4};
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std::array<T, 4> expected = {5, 5, 5, 5};
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test<Iter>(in, 0, 4, 5, expected);
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}
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{
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std::array<T, 4> in = {1, 2, 3, 4};
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std::array<T, 4> expected = {1, 5, 5, 4};
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test<Iter>(in, 1, 3, 5, expected);
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}
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}
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};
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TEST_CONSTEXPR_CXX20 bool test() {
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types::for_each(types::forward_iterator_list<char*>(), Test<char>());
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types::for_each(types::forward_iterator_list<int*>(), Test<int>());
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{ // test vector<bool>::iterator optimization
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{ // simple case
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std::vector<bool> in(4, false);
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std::vector<bool> expected(4, true);
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std::fill(in.begin(), in.end(), true);
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assert(in == expected);
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}
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{ // partial byte in the front is not filled
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std::vector<bool> in(8, false);
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std::vector<bool> expected(8, true);
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expected[0] = false;
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expected[1] = false;
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std::fill(in.begin() + 2, in.end(), true);
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assert(in == expected);
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}
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{ // partial byte in the back is not filled
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std::vector<bool> in(8, false);
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std::vector<bool> expected(8, true);
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expected[6] = false;
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expected[7] = false;
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std::fill(in.begin(), in.end() - 2, true);
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assert(in == expected);
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}
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{ // partial byte in the front and back is not filled
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std::vector<bool> in(16, false);
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std::vector<bool> expected(16, true);
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expected[0] = false;
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expected[1] = false;
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expected[14] = false;
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expected[15] = false;
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std::fill(in.begin() + 2, in.end() - 2, true);
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assert(in == expected);
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}
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{ // only a few bits of a byte are set
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std::vector<bool> in(8, false);
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std::vector<bool> expected(8, true);
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expected[0] = false;
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expected[1] = false;
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expected[6] = false;
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expected[7] = false;
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std::fill(in.begin() + 2, in.end() - 2, true);
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assert(in == expected);
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}
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}
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return true;
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}
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int main(int, char**) {
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test();
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#if TEST_STD_VER >= 20
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static_assert(test());
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#endif
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return 0;
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}
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