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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/ArgumentCoder.h>
#include <wtf/HashTraits.h>
#include <wtf/RunLoop.h>
namespace WTF {
struct CallbackIDHash;
}
namespace WebKit {
class CallbackID {
public:
ALWAYS_INLINE explicit CallbackID()
{ }
ALWAYS_INLINE CallbackID(const CallbackID& otherID)
: m_id(otherID.m_id)
{
ASSERT(HashTraits<uint64_t>::emptyValue() != m_id && !HashTraits<uint64_t>::isDeletedValue(m_id));
}
ALWAYS_INLINE CallbackID& operator=(const CallbackID& otherID)
{
m_id = otherID.m_id;
return *this;
}
bool operator==(const CallbackID& other) const { return m_id == other.m_id; }
uint64_t toInteger() const { return m_id; }
ALWAYS_INLINE bool isValid() const { return isValidCallbackID(m_id); }
static ALWAYS_INLINE bool isValidCallbackID(uint64_t rawId)
{
return HashTraits<uint64_t>::emptyValue() != rawId && !HashTraits<uint64_t>::isDeletedValue(rawId);
}
static ALWAYS_INLINE CallbackID fromInteger(uint64_t rawId)
{
RELEASE_ASSERT(isValidCallbackID(rawId));
return CallbackID(rawId);
}
static CallbackID generateID()
{
ASSERT(RunLoop::isMain());
static uint64_t uniqueCallbackID = 1;
return CallbackID(uniqueCallbackID++);
}
private:
friend struct IPC::ArgumentCoder<CallbackID, void>;
ALWAYS_INLINE explicit CallbackID(uint64_t newID)
: m_id(newID)
{
ASSERT(newID != HashTraits<uint64_t>::emptyValue());
}
friend class CallbackMap;
template <typename CallbackType> friend class SpecificCallbackMap;
friend struct WTF::CallbackIDHash;
friend HashTraits<WebKit::CallbackID>;
uint64_t m_id { HashTraits<uint64_t>::emptyValue() };
};
}
namespace WTF {
struct CallbackIDHash {
static unsigned hash(const WebKit::CallbackID& callbackID) { return intHash(callbackID.m_id); }
static bool equal(const WebKit::CallbackID& a, const WebKit::CallbackID& b) { return a.m_id == b.m_id; }
static const bool safeToCompareToEmptyOrDeleted = true;
};
template<> struct HashTraits<WebKit::CallbackID> : GenericHashTraits<WebKit::CallbackID> {
static WebKit::CallbackID emptyValue() { return WebKit::CallbackID(); }
static void constructDeletedValue(WebKit::CallbackID& slot) { HashTraits<uint64_t>::constructDeletedValue(slot.m_id); }
static bool isDeletedValue(const WebKit::CallbackID& slot) { return HashTraits<uint64_t>::isDeletedValue(slot.m_id); }
};
template<> struct DefaultHash<WebKit::CallbackID> : CallbackIDHash { };
}
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