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
10
11#include <algorithm>
12#include <cstddef>
13#include <deque>
14#include <iterator>
15#include <list>
16#include <string>
17#include <vector>
18
19#include "benchmark/benchmark.h"
20#include "../../GenerateInput.h"
21
22int main(int argc, char** argv) {
23 auto std_reverse_copy = [](auto first, auto last, auto out) { return std::reverse_copy(first, last, out); };
24
25 // {std,ranges}::reverse_copy(normal container)
26 {
27 auto bm = []<class Container>(std::string name, auto reverse_copy) {
28 benchmark::RegisterBenchmark(name, [reverse_copy](auto& st) {
29 std::size_t const size = st.range(0);
30 using ValueType = typename Container::value_type;
31 Container c;
32 std::generate_n(std::back_inserter(c), size, [] { return Generate<ValueType>::random(); });
33
34 std::vector<ValueType> out(size);
35
36 for ([[maybe_unused]] auto _ : st) {
37 benchmark::DoNotOptimize(c);
38 benchmark::DoNotOptimize(out);
39 auto result = reverse_copy(c.begin(), c.end(), out.begin());
40 benchmark::DoNotOptimize(result);
41 }
42 })->Range(8, 1 << 15);
43 };
44 bm.operator()<std::vector<int>>(name: "std::reverse_copy(vector<int>)", reverse_copy: std_reverse_copy);
45 bm.operator()<std::deque<int>>(name: "std::reverse_copy(deque<int>)", reverse_copy: std_reverse_copy);
46 bm.operator()<std::list<int>>(name: "std::reverse_copy(list<int>)", reverse_copy: std_reverse_copy);
47 bm.operator()<std::vector<int>>("rng::reverse_copy(vector<int>)", std::ranges::reverse_copy);
48 bm.operator()<std::deque<int>>("rng::reverse_copy(deque<int>)", std::ranges::reverse_copy);
49 bm.operator()<std::list<int>>("rng::reverse_copy(list<int>)", std::ranges::reverse_copy);
50 }
51
52 benchmark::Initialize(&argc, argv);
53 benchmark::RunSpecifiedBenchmarks();
54 benchmark::Shutdown();
55 return 0;
56}
57

source code of libcxx/test/benchmarks/algorithms/modifying/reverse_copy.bench.cpp