left_shift.pass.cpp
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// test bitset<N> operator<<(size_t pos) const;
#include <bitset>
#include <cstdlib>
#include <cassert>
#include "test_macros.h"
#if defined(TEST_COMPILER_CLANG)
#pragma clang diagnostic ignored "-Wtautological-compare"
#elif defined(TEST_COMPILER_C1XX)
#pragma warning(disable: 6294) // Ill-defined for-loop: initial condition does not satisfy test. Loop body not executed.
#endif
template <std::size_t N>
std::bitset<N>
make_bitset()
{
std::bitset<N> v;
for (std::size_t i = 0; i < N; ++i)
v[i] = static_cast<bool>(std::rand() & 1);
return v;
}
template <std::size_t N>
void test_left_shift()
{
for (std::size_t s = 0; s <= N+1; ++s)
{
std::bitset<N> v1 = make_bitset<N>();
std::bitset<N> v2 = v1;
assert((v1 <<= s) == (v2 << s));
}
}
int main(int, char**)
{
test_left_shift<0>();
test_left_shift<1>();
test_left_shift<31>();
test_left_shift<32>();
test_left_shift<33>();
test_left_shift<63>();
test_left_shift<64>();
test_left_shift<65>();
test_left_shift<1000>();
return 0;
}