chromium/third_party/blink/renderer/platform/wtf/text/string_hash.h

/*
 * Copyright (C) 2006, 2007, 2008, 2012, 2013 Apple Inc. All rights reserved
 * Copyright (C) Research In Motion Limited 2009. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_STRING_HASH_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_STRING_HASH_H_

#include "base/check_op.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/hash_traits.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hasher.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"

namespace WTF {

// The GetHash() functions in below HashTraits do not support null strings.
// find(), Contains(), and insert() on HashMap<String,...> cause a null-pointer
// dereference when passed null strings.

template <>
struct HashTraits<StringImpl*> : GenericHashTraits<StringImpl*> { … };

template <>
struct HashTraits<scoped_refptr<StringImpl>>
    : GenericHashTraits<scoped_refptr<StringImpl>> { … };

template <>
struct HashTraits<String> : SimpleClassHashTraits<String> { … };

}  // namespace WTF

namespace std {
template <>
struct hash<WTF::String> { … };
}  // namespace std

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_STRING_HASH_H_