libcxx/test/std/ranges/range.factories/range.iota.view/ctad.compile.pass.cpp

   1 //===----------------------------------------------------------------------===//
   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 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10
  11 // template<class W, class Bound>
  12 //     requires (!is-integer-like<W> || !is-integer-like<Bound> ||
  13 //               (is-signed-integer-like<W> == is-signed-integer-like<Bound>))
  14 //     iota_view(W, Bound) -> iota_view<W, Bound>;
  15
  16 #include <ranges>
  17 #include <cassert>
  18 #include <concepts>
  19
  20 #include "test_macros.h"
  21 #include "types.h"
  22
  23 template<class T, class U>
  24 concept CanDeduce = requires(const T& t, const U& u) {
  25   std::ranges::iota_view(t, u);
  26 };
  27
  28 void test() {
  29   static_assert(std::same_as<
  30     decltype(std::ranges::iota_view(0, 0)),
  31     std::ranges::iota_view<int, int>
  32   >);
  33
  34   static_assert(std::same_as<
  35     decltype(std::ranges::iota_view(0)),
  36     std::ranges::iota_view<int, std::unreachable_sentinel_t>
  37   >);
  38
  39   static_assert(std::same_as<
  40     decltype(std::ranges::iota_view(0, std::unreachable_sentinel)),
  41     std::ranges::iota_view<int, std::unreachable_sentinel_t>
  42   >);
  43
  44   static_assert(std::same_as<
  45     decltype(std::ranges::iota_view(0, IntComparableWith(0))),
  46     std::ranges::iota_view<int, IntComparableWith<int>>
  47   >);
  48
  49   static_assert( CanDeduce<int, int>);
  50   static_assert(!CanDeduce<int, unsigned>);
  51   static_assert(!CanDeduce<unsigned, int>);
  52 }