third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.value.bound.pass.cpp

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14, c++17

#include "test_macros.h"

TEST_CLANG_DIAGNOSTIC_IGNORED("-Wsign-compare")
TEST_GCC_DIAGNOSTIC_IGNORED("-Wsign-compare")
TEST_MSVC_DIAGNOSTIC_IGNORED(4018 4389) // various "signed/unsigned mismatch"

// constexpr iota_view(type_identity_t<W> value, type_identity_t<Bound> bound);

#include <ranges>
#include <cassert>

#include "types.h"

constexpr bool test() {
  {
    std::ranges::iota_view<SomeInt, SomeInt> io(SomeInt(0), SomeInt(10));
    assert(std::ranges::next(io.begin(), 10) == io.end());
  }

  {
    std::ranges::iota_view<SomeInt> io(SomeInt(0), std::unreachable_sentinel);
    assert(std::ranges::next(io.begin(), 10) != io.end());
  }

  {
    std::ranges::iota_view<SomeInt, IntComparableWith<SomeInt>> io(SomeInt(0), IntComparableWith(SomeInt(10)));
    assert(std::ranges::next(io.begin(), 10) == io.end());
  }

  {
    // This is allowed only when using the constructor (not the deduction guide).
    std::ranges::iota_view<int, unsigned> signedUnsigned(0, 10);
    assert(std::ranges::next(signedUnsigned.begin(), 10) == signedUnsigned.end());
  }

  {
    // This is allowed only when using the constructor (not the deduction guide).
    std::ranges::iota_view<unsigned, int> signedUnsigned(0, 10);
    assert(std::ranges::next(signedUnsigned.begin(), 10) == signedUnsigned.end());
  }

  return true;
}

int main(int, char**) {
  test();
  static_assert(test());

  return 0;
}