xref: /llvm-project-15.0.7/libcxx/test/std/ranges/range.adaptors/range.zip/general.pass.cpp (revision 042dc3c4)

//===----------------------------------------------------------------------===//
//
// 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, c++20
// UNSUPPORTED: libcpp-has-no-incomplete-ranges

// Some basic examples of how zip_view might be used in the wild. This is a general
// collection of sample algorithms and functions that try to mock general usage of
// this view.

#include <ranges>

#include <array>
#include <cassert>
#include <vector>
#include <string>

int main(int, char**) {
  {
    std::ranges::zip_view v{
        std::array{1, 2},
        std::vector{4, 5, 6},
        std::array{7},
    };
    assert(std::ranges::size(v) == 1);
    assert(*v.begin() == std::make_tuple(1, 4, 7));
  }
  {
    using namespace std::string_literals;
    std::vector v{1, 2, 3, 4};
    std::array a{"abc"s, "def"s, "gh"s};
    auto view = std::views::zip(v, a);
    auto it = view.begin();
    assert(&(std::get<0>(*it)) == &(v[0]));
    assert(&(std::get<1>(*it)) == &(a[0]));

    ++it;
    assert(&(std::get<0>(*it)) == &(v[1]));
    assert(&(std::get<1>(*it)) == &(a[1]));

    ++it;
    assert(&(std::get<0>(*it)) == &(v[2]));
    assert(&(std::get<1>(*it)) == &(a[2]));

    ++it;
    assert(it == view.end());
  }

  return 0;
}