refcount-test.c++

// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
// Licensed under the MIT License:
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include "refcount.h"
#include <kj/compat/gtest.h>

namespace kj {

struct SetTrueInDestructor: public Refcounted {
  SetTrueInDestructor(bool* ptr): ptr(ptr) {}
  ~SetTrueInDestructor() { *ptr = true; }

  bool* ptr;
};

TEST(Refcount, Basic) {
  bool b = false;
  Own<SetTrueInDestructor> ref1 = kj::refcounted<SetTrueInDestructor>(&b);
  EXPECT_FALSE(ref1->isShared());
  Own<SetTrueInDestructor> ref2 = kj::addRef(*ref1);
  EXPECT_TRUE(ref1->isShared());
  Own<SetTrueInDestructor> ref3 = kj::addRef(*ref2);
  EXPECT_TRUE(ref1->isShared());

  EXPECT_FALSE(b);
  ref1 = Own<SetTrueInDestructor>();
  EXPECT_TRUE(ref2->isShared());
  EXPECT_FALSE(b);
  ref3 = Own<SetTrueInDestructor>();
  EXPECT_FALSE(ref2->isShared());
  EXPECT_FALSE(b);
  ref2 = Own<SetTrueInDestructor>();
  EXPECT_TRUE(b);

#if defined(KJ_DEBUG) && !KJ_NO_EXCEPTIONS
  b = false;
  SetTrueInDestructor obj(&b);
  EXPECT_ANY_THROW(addRef(obj));
#endif
}

}  // namespace kj