xref: /llvm-project-15.0.7/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.outer.value/view_interface.pass.cpp (revision e53c461b)

//===----------------------------------------------------------------------===//
//
// 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
// UNSUPPORTED: libcpp-has-no-incomplete-ranges

// class std::ranges::lazy_split_view::outer-iterator::value_type;

#include <ranges>

#include <cassert>
#include <concepts>
#include "../types.h"

using V = ValueTypeForward;
static_assert(std::ranges::forward_range<V>);
static_assert(std::ranges::view<V>);

static_assert(std::is_base_of_v<std::ranges::view_interface<ValueTypeForward>, ValueTypeForward>);

constexpr bool test() {
  // empty()
  {
    {
      SplitViewForward v("abc def", " ");
      auto val = *v.begin();
      assert(!val.empty());
    }

    {
      SplitViewForward v;
      auto val = *v.begin();
      assert(val.empty());
    }
  }

  // operator bool()
  {
    {
      SplitViewForward v("abc def", " ");
      auto val = *v.begin();
      assert(val);
    }

    {
      SplitViewForward v;
      auto val = *v.begin();
      assert(!val);
    }
  }

  // front()
  {
    SplitViewForward v("abc def", " ");
    auto val = *v.begin();
    assert(val.front() == 'a');
  }

  return true;
}

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

  return 0;
}