libcxx/test/std/re/re.results/re.results.const/default.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 // <regex>
  10
  11 // class match_results<BidirectionalIterator, Allocator>
  12
  13 // explicit match_results(const Allocator& a = Allocator()); // before C++20
  14 // match_results() : match_results(Allocator()) {}           // C++20
  15 // explicit match_results(const Allocator& a);               // C++20
  16
  17 #include <regex>
  18 #include <cassert>
  19 #include "test_macros.h"
  20 #if TEST_STD_VER >= 11
  21 #include "test_convertible.h"
  22
  23 template <typename T>
  24 void test_implicit() {
  25   static_assert(test_convertible<T>(), "");
  26   static_assert(!test_convertible<T, typename T::allocator_type>(), "");
  27 }
  28 #endif
  29
  30 template <class CharT>
  31 void
  32 test()
  33 {
  34     typedef std::match_results<const CharT*> M;
  35     typedef std::allocator<std::sub_match<const CharT*> > Alloc;
  36     M m;
  37     assert(m.size() == 0);
  38     assert(!m.ready());
  39     assert(m.get_allocator() == Alloc());
  40
  41 #if TEST_STD_VER >= 11
  42     test_implicit<M>();
  43 #endif
  44 }
  45
  46 int main(int, char**)
  47 {
  48     test<char>();
  49 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  50     test<wchar_t>();
  51 #endif
  52
  53   return 0;
  54 }