libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.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 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10
  11 // template <class T>
  12 //   constexpr T bit_ceil(T x) noexcept;
  13
  14 // Constraints: T is an unsigned integer type
  15 // Returns: The minimal value y such that has_single_bit(y) is true and y >= x;
  16 //    if y is not representable as a value of type T, the result is an unspecified value.
  17
  18 #include <bit>
  19 #include <cassert>
  20 #include <cstdint>
  21 #include <type_traits>
  22
  23 #include "test_macros.h"
  24
  25 struct A {};
  26 enum       E1 : unsigned char { rEd };
  27 enum class E2 : unsigned char { red };
  28
  29 template <class T>
  30 constexpr bool test()
  31 {
  32     ASSERT_SAME_TYPE(decltype(std::bit_ceil(T())), T);
  33     LIBCPP_ASSERT_NOEXCEPT(std::bit_ceil(T()));
  34
  35     assert(std::bit_ceil(T(0)) == T(1));
  36     assert(std::bit_ceil(T(1)) == T(1));
  37     assert(std::bit_ceil(T(2)) == T(2));
  38     assert(std::bit_ceil(T(3)) == T(4));
  39     assert(std::bit_ceil(T(4)) == T(4));
  40     assert(std::bit_ceil(T(5)) == T(8));
  41     assert(std::bit_ceil(T(6)) == T(8));
  42     assert(std::bit_ceil(T(7)) == T(8));
  43     assert(std::bit_ceil(T(8)) == T(8));
  44     assert(std::bit_ceil(T(9)) == T(16));
  45     assert(std::bit_ceil(T(60)) == T(64));
  46     assert(std::bit_ceil(T(61)) == T(64));
  47     assert(std::bit_ceil(T(62)) == T(64));
  48     assert(std::bit_ceil(T(63)) == T(64));
  49     assert(std::bit_ceil(T(64)) == T(64));
  50     assert(std::bit_ceil(T(65)) == T(128));
  51     assert(std::bit_ceil(T(66)) == T(128));
  52     assert(std::bit_ceil(T(67)) == T(128));
  53     assert(std::bit_ceil(T(68)) == T(128));
  54     assert(std::bit_ceil(T(69)) == T(128));
  55
  56 #ifndef TEST_HAS_NO_INT128
  57     if constexpr (std::is_same_v<T, __uint128_t>) {
  58         T val = 168;
  59         T ceil = 256;
  60
  61         assert(std::bit_ceil(val) == ceil);
  62         assert(std::bit_ceil(val << 32) == (ceil << 32));
  63         assert(std::bit_ceil((val << 64) | 0x1) == (ceil << 64));
  64         assert(std::bit_ceil((val << 72) | 0x1) == (ceil << 72));
  65         assert(std::bit_ceil((val << 100) | 0x1) == (ceil << 100));
  66     }
  67 #endif
  68
  69     return true;
  70 }
  71
  72 int main(int, char**)
  73 {
  74     {
  75     auto lambda = [](auto x) -> decltype(std::bit_ceil(x)) {};
  76     using L = decltype(lambda);
  77
  78     static_assert(!std::is_invocable_v<L, signed char>);
  79     static_assert(!std::is_invocable_v<L, short>);
  80     static_assert(!std::is_invocable_v<L, int>);
  81     static_assert(!std::is_invocable_v<L, long>);
  82     static_assert(!std::is_invocable_v<L, long long>);
  83 #ifndef TEST_HAS_NO_INT128
  84     static_assert(!std::is_invocable_v<L, __int128_t>);
  85 #endif
  86
  87     static_assert(!std::is_invocable_v<L, std::int8_t>);
  88     static_assert(!std::is_invocable_v<L, std::int16_t>);
  89     static_assert(!std::is_invocable_v<L, std::int32_t>);
  90     static_assert(!std::is_invocable_v<L, std::int64_t>);
  91     static_assert(!std::is_invocable_v<L, std::intmax_t>);
  92     static_assert(!std::is_invocable_v<L, std::intptr_t>);
  93     static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
  94
  95     static_assert(!std::is_invocable_v<L, bool>);
  96     static_assert(!std::is_invocable_v<L, char>);
  97     static_assert(!std::is_invocable_v<L, wchar_t>);
  98 #ifndef TEST_HAS_NO_CHAR8_T
  99     static_assert(!std::is_invocable_v<L, char8_t>);
 100 #endif
 101     static_assert(!std::is_invocable_v<L, char16_t>);
 102     static_assert(!std::is_invocable_v<L, char32_t>);
 103
 104     static_assert(!std::is_invocable_v<L, A>);
 105     static_assert(!std::is_invocable_v<L, A*>);
 106     static_assert(!std::is_invocable_v<L, E1>);
 107     static_assert(!std::is_invocable_v<L, E2>);
 108     }
 109
 110     static_assert(test<unsigned char>());
 111     static_assert(test<unsigned short>());
 112     static_assert(test<unsigned int>());
 113     static_assert(test<unsigned long>());
 114     static_assert(test<unsigned long long>());
 115 #ifndef TEST_HAS_NO_INT128
 116     static_assert(test<__uint128_t>());
 117 #endif
 118     static_assert(test<std::uint8_t>());
 119     static_assert(test<std::uint16_t>());
 120     static_assert(test<std::uint32_t>());
 121     static_assert(test<std::uint64_t>());
 122     static_assert(test<std::uintmax_t>());
 123     static_assert(test<std::uintptr_t>());
 124     static_assert(test<std::size_t>());
 125
 126     test<unsigned char>();
 127     test<unsigned short>();
 128     test<unsigned int>();
 129     test<unsigned long>();
 130     test<unsigned long long>();
 131 #ifndef TEST_HAS_NO_INT128
 132     test<__uint128_t>();
 133 #endif
 134     test<std::uint8_t>();
 135     test<std::uint16_t>();
 136     test<std::uint32_t>();
 137     test<std::uint64_t>();
 138     test<std::uintmax_t>();
 139     test<std::uintptr_t>();
 140     test<std::size_t>();
 141
 142     return 0;
 143 }