libc/test/src/__support/CPP/integer_sequence_test.cpp

   1 //===-- Unittests for IntegerSequence -------------------------------------===//
   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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/__support/CPP/utility.h"
  10 #include "test/UnitTest/Test.h"
  11
  12 using namespace LIBC_NAMESPACE::cpp;
  13
  14 TEST(LlvmLibcIntegerSequencetTest, Basic) {
  15   EXPECT_TRUE(
  16       (is_same_v<integer_sequence<int>, make_integer_sequence<int, 0>>));
  17   using ISeq = integer_sequence<int, 0, 1, 2, 3>;
  18   EXPECT_TRUE((is_same_v<ISeq, make_integer_sequence<int, 4>>));
  19   using LSeq = integer_sequence<long, 0, 1, 2, 3>;
  20   EXPECT_TRUE((is_same_v<LSeq, make_integer_sequence<long, 4>>));
  21   using ULLSeq = integer_sequence<unsigned long long, 0ull, 1ull, 2ull, 3ull>;
  22   EXPECT_TRUE(
  23       (is_same_v<ULLSeq, make_integer_sequence<unsigned long long, 4>>));
  24 }
  25
  26 template <typename T, T... Ts> bool checkArray(integer_sequence<T, Ts...> seq) {
  27   T arr[sizeof...(Ts)]{Ts...};
  28
  29   for (T i = 0; i < static_cast<T>(sizeof...(Ts)); i++)
  30     if (arr[i] != i)
  31       return false;
  32
  33   return true;
  34 }
  35
  36 TEST(LlvmLibcIntegerSequencetTest, Many) {
  37   EXPECT_TRUE(checkArray(make_integer_sequence<int, 100>{}));
  38 }