libcxx/test/std/iterators/iterator.range/begin-end.initializer_list.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
  10
  11 // <iterator>
  12 //
  13 // Note that begin and end are tested in libcxx/test/std/language.support/support.initlist/support.initlist.range/begin_end.pass.cpp
  14 //
  15 // template <class E> constexpr reverse_iterator<const E*> rbegin(initializer_list<E> il); // C++14, constexpr since C++17
  16 // template <class E> constexpr reverse_iterator<const E*> rend(initializer_list<E> il);   // C++14, constexpr since C++17
  17
  18 #include <cassert>
  19 #include <initializer_list>
  20 #include <iterator>
  21
  22 #include "test_macros.h"
  23
  24 TEST_CONSTEXPR_CXX17 bool test() {
  25   std::initializer_list<int> il = {1, 2, 3};
  26   ASSERT_SAME_TYPE(decltype(std::rbegin(il)), std::reverse_iterator<const int*>);
  27   ASSERT_SAME_TYPE(decltype(std::rend(il)), std::reverse_iterator<const int*>);
  28   assert(std::rbegin(il).base() == il.end());
  29   assert(std::rend(il).base() == il.begin());
  30
  31   const auto& cil = il;
  32   ASSERT_SAME_TYPE(decltype(std::rbegin(cil)), std::reverse_iterator<const int*>);
  33   ASSERT_SAME_TYPE(decltype(std::rend(cil)), std::reverse_iterator<const int*>);
  34   assert(std::rbegin(cil).base() == il.end());
  35   assert(std::rend(cil).base() == il.begin());
  36   return true;
  37 }
  38
  39 int main(int, char**) {
  40   test();
  41 #if TEST_STD_VER >= 17
  42   static_assert(test());
  43 #endif
  44
  45   return 0;
  46 }