62 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// ADDITIONAL_COMPILE_FLAGS(has-fconstexpr-steps): -fconstexpr-steps=1500000010 11// bitset<N>& operator<<=(size_t pos); // constexpr since C++2312 13#include <bitset>14#include <cassert>15#include <cstddef>16#include <vector>17 18#include "../bitset_test_cases.h"19#include "test_macros.h"20 21template <std::size_t N>22TEST_CONSTEXPR_CXX23 bool test_left_shift() {23 std::vector<std::bitset<N> > const cases = get_test_cases<N>();24 for (std::size_t c = 0; c != cases.size(); ++c) {25 for (std::size_t s = 0; s <= N + 1; ++s) {26 std::bitset<N> v1 = cases[c];27 std::bitset<N> v2 = v1;28 v1 <<= s;29 for (std::size_t i = 0; i < v1.size(); ++i)30 if (i < s)31 assert(v1[i] == 0);32 else33 assert(v1[i] == v2[i - s]);34 }35 }36 return true;37}38 39int main(int, char**) {40 test_left_shift<0>();41 test_left_shift<1>();42 test_left_shift<31>();43 test_left_shift<32>();44 test_left_shift<33>();45 test_left_shift<63>();46 test_left_shift<64>();47 test_left_shift<65>();48 test_left_shift<1000>(); // not in constexpr because of constexpr evaluation step limits49#if TEST_STD_VER > 2050 static_assert(test_left_shift<0>());51 static_assert(test_left_shift<1>());52 static_assert(test_left_shift<31>());53 static_assert(test_left_shift<32>());54 static_assert(test_left_shift<33>());55 static_assert(test_left_shift<63>());56 static_assert(test_left_shift<64>());57 static_assert(test_left_shift<65>());58#endif59 60 return 0;61}62