xref: /llvm-project/libcxx/test/std/utilities/template.bitset/bitset.members/left_shift.pass.cpp (revision 56ae3568ead3beea5629ad20695f38d1e5ef26dc)
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 
22 template <std::size_t N>
test_left_shift()23 TEST_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 
test()34 TEST_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 
main(int,char **)47 int 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