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// The CI "Apple back-deployment with assertions enabled" needs a higher value
10// ADDITIONAL_COMPILE_FLAGS(has-fconstexpr-steps): -fconstexpr-steps=12712420
11
12// bitset<N> operator<<(size_t pos) const; // constexpr since C++23
13
14#include <bitset>
15#include <cassert>
16#include <cstddef>
17#include <vector>
18
19#include "../bitset_test_cases.h"
20#include "test_macros.h"
21
22template <std::size_t N>
23TEST_CONSTEXPR_CXX23 void test_left_shift() {
24 std::vector<std::bitset<N> > const cases = get_test_cases<N>();
25 for (std::size_t c = 0; c != cases.size(); ++c) {
26 for (std::size_t s = 0; s <= N+1; ++s) {
27 std::bitset<N> v1 = cases[c];
28 std::bitset<N> v2 = v1;
29 assert((v1 <<= s) == (v2 << s));
30 }
31 }
32}
33
34TEST_CONSTEXPR_CXX23 bool test() {
35 test_left_shift<0>();
36 test_left_shift<1>();
37 test_left_shift<31>();
38 test_left_shift<32>();
39 test_left_shift<33>();
40 test_left_shift<63>();
41 test_left_shift<64>();
42 test_left_shift<65>();
43
44 return true;
45}
46
47int main(int, char**) {
48 test();
49 test_left_shift<1000>(); // not in constexpr because of constexpr evaluation step limits
50#if TEST_STD_VER > 20
51 static_assert(test());
52#endif
53
54 return 0;
55}
56

source code of libcxx/test/std/utilities/template.bitset/bitset.members/left_shift.pass.cpp