libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_bool.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 // <memory>
  10
  11 // shared_ptr
  12
  13 // explicit operator bool() const;
  14
  15 #include <memory>
  16 #include <cassert>
  17 #include <type_traits>
  18
  19 #include "test_macros.h"
  20
  21 struct A {
  22   int a;
  23   virtual ~A(){};
  24 };
  25 struct B : A {};
  26
  27 int main(int, char**)
  28 {
  29     static_assert(std::is_constructible<bool, std::shared_ptr<A> >::value, "");
  30     static_assert(!std::is_convertible<std::shared_ptr<A>, bool>::value, "");
  31
  32     {
  33       const std::shared_ptr<int> p(new int(32));
  34       assert(p);
  35     }
  36     {
  37       const std::shared_ptr<int> p;
  38       assert(!p);
  39     }
  40 #if !defined(TEST_HAS_NO_RTTI)
  41     {
  42       std::shared_ptr<A> basePtr = std::make_shared<B>();
  43       std::shared_ptr<B> sp = std::dynamic_pointer_cast<B>(basePtr);
  44       assert(sp);
  45     }
  46 #endif
  47
  48     return 0;
  49 }