c52f43e72d
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@111767 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// test unsigned long long to_ullong() const;
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#include <bitset>
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#include <algorithm>
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#include <climits>
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#include <cassert>
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template <std::size_t N>
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void test_to_ullong()
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{
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const std::size_t M = sizeof(unsigned long long) * CHAR_BIT < N ? sizeof(unsigned long long) * CHAR_BIT : N;
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const std::size_t X = M == 0 ? sizeof(unsigned long long) * CHAR_BIT - 1 : sizeof(unsigned long long) * CHAR_BIT - M;
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const unsigned long long max = M == 0 ? 0 : (unsigned long long)(-1) >> X;
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unsigned long long tests[] = {0,
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std::min<unsigned long long>(1, max),
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std::min<unsigned long long>(2, max),
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std::min<unsigned long long>(3, max),
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std::min(max, max-3),
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std::min(max, max-2),
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std::min(max, max-1),
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max};
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for (std::size_t i = 0; i < sizeof(tests)/sizeof(tests[0]); ++i)
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{
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unsigned long long j = tests[i];
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std::bitset<N> v(j);
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assert(j == v.to_ullong());
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}
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}
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int main()
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{
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test_to_ullong<0>();
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test_to_ullong<1>();
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test_to_ullong<31>();
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test_to_ullong<32>();
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test_to_ullong<33>();
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test_to_ullong<63>();
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test_to_ullong<64>();
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test_to_ullong<65>();
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test_to_ullong<1000>();
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}
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