55 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// size_t count() const; // constexpr since C++2310 11#include <bitset>12#include <cassert>13#include <cstddef>14#include <vector>15 16#include "../bitset_test_cases.h"17#include "test_macros.h"18 19template <std::size_t N>20TEST_CONSTEXPR_CXX23 void test_count() {21 std::vector<std::bitset<N> > const cases = get_test_cases<N>();22 for (std::size_t c = 0; c != cases.size(); ++c) {23 const std::bitset<N> v = cases[c];24 std::size_t c1 = v.count();25 std::size_t c2 = 0;26 for (std::size_t i = 0; i < v.size(); ++i)27 if (v[i])28 ++c2;29 assert(c1 == c2);30 }31}32 33TEST_CONSTEXPR_CXX23 bool test() {34 test_count<0>();35 test_count<1>();36 test_count<31>();37 test_count<32>();38 test_count<33>();39 test_count<63>();40 test_count<64>();41 test_count<65>();42 43 return true;44}45 46int main(int, char**) {47 test();48 test_count<1000>(); // not in constexpr because of constexpr evaluation step limits49#if TEST_STD_VER > 2050 static_assert(test());51#endif52 53 return 0;54}55