libcxx/test/std/ranges/range.utility/range.subrange/ctor.begin_end.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 // class std::ranges::subrange;
  12
  13 #include <ranges>
  14
  15 #include "types.h"
  16 #include <cassert>
  17 #include "test_macros.h"
  18 #include "test_iterators.h"
  19
  20 // convertible-to-non-slicing cases:
  21 //   1. Not convertible (fail)
  22 //   2. Only one is a pointer (succeed)
  23 //   3. Both are not pointers (succeed)
  24 //   4. Pointer elements are different types (fail)
  25 //   5. Pointer elements are same type (succeed)
  26
  27 // !StoreSize ctor.
  28 static_assert( std::is_constructible_v<ForwardSubrange, ForwardIter, ForwardIter>); // Default case.
  29 static_assert(!std::is_constructible_v<ForwardSubrange, Empty, ForwardIter>); // 1.
  30 static_assert( std::is_constructible_v<ConvertibleForwardSubrange, ConvertibleForwardIter, int*>); // 2.
  31 static_assert( std::is_constructible_v<ForwardSubrange, ForwardIter, ForwardIter>); // 3. (Same as default case.)
  32 // 4. and 5. must be sized.
  33
  34 constexpr bool test() {
  35   ForwardSubrange a(ForwardIter(globalBuff), ForwardIter(globalBuff + 8));
  36   assert(base(a.begin()) == globalBuff);
  37   assert(base(a.end()) == globalBuff + 8);
  38
  39   ConvertibleForwardSubrange b(ConvertibleForwardIter(globalBuff), globalBuff + 8);
  40   assert(b.begin() == globalBuff);
  41   assert(b.end() == globalBuff + 8);
  42
  43   return true;
  44 }
  45
  46 int main(int, char**) {
  47   test();
  48   static_assert(test());
  49
  50   return 0;
  51 }