Source/WTF/wtf/URLHash.h

/*
 * Copyright (C) 2008-2019 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. ``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
 * 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. 
 */

#ifndef URLHash_h
#define URLHash_h

#include <wtf/URL.h>
#include <wtf/text/StringHash.h>
#include <wtf/text/WTFString.h>

namespace WTF {

struct URLHash {
    static unsigned hash(const URL& key)
    {
        return key.string().impl()->hash();
    }

    static bool equal(const URL& a, const URL& b)
    {
        return StringHash::equal(a.string(), b.string());
    }

    static constexpr bool safeToCompareToEmptyOrDeleted = false;
    static constexpr bool hasHashInValue = true;
};

// URLHash is the default hash for String
template<> struct DefaultHash<URL> : URLHash { };

template<> struct HashTraits<URL> : SimpleClassHashTraits<URL> { };

} // namespace WTF

#endif // URLHash_h