test/std/utilities/template.bitset/bitset.members/to_ullong.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // test unsigned long long to_ullong() const;
  11
  12 #include <bitset>
  13 #include <algorithm>
  14 #include <type_traits>
  15 #include <climits>
  16 #include <cassert>
  17
  18 template <std::size_t N>
  19 void test_to_ullong()
  20 {
  21     const std::size_t M = sizeof(unsigned long long) * CHAR_BIT < N ? sizeof(unsigned long long) * CHAR_BIT : N;
  22     const bool is_M_zero = std::integral_constant<bool, M == 0>::value; // avoid compiler warnings
  23     const std::size_t X = is_M_zero ? sizeof(unsigned long long) * CHAR_BIT - 1 : sizeof(unsigned long long) * CHAR_BIT - M;
  24     const unsigned long long max = is_M_zero ? 0 : (unsigned long long)(-1) >> X;
  25     unsigned long long tests[] = {0,
  26                            std::min<unsigned long long>(1, max),
  27                            std::min<unsigned long long>(2, max),
  28                            std::min<unsigned long long>(3, max),
  29                            std::min(max, max-3),
  30                            std::min(max, max-2),
  31                            std::min(max, max-1),
  32                            max};
  33     for (std::size_t i = 0; i < sizeof(tests)/sizeof(tests[0]); ++i)
  34     {
  35         unsigned long long j = tests[i];
  36         std::bitset<N> v(j);
  37         assert(j == v.to_ullong());
  38     }
  39 }
  40
  41 int main()
  42 {
  43     test_to_ullong<0>();
  44     test_to_ullong<1>();
  45     test_to_ullong<31>();
  46     test_to_ullong<32>();
  47     test_to_ullong<33>();
  48     test_to_ullong<63>();
  49     test_to_ullong<64>();
  50     test_to_ullong<65>();
  51     test_to_ullong<1000>();
  52 }