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/*
* Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
*
* 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/text/StringImpl.h>
namespace WTF {
// It represents that the string impl is uniqued in some ways.
// When the given 2 string impls are both uniqued string impls, we can compare it just using pointer comparison.
class SUPPRESS_REFCOUNTED_WITHOUT_VIRTUAL_DESTRUCTOR UniquedStringImpl : public StringImpl {
private:
UniquedStringImpl() = delete;
protected:
inline UniquedStringImpl(CreateSymbolTag, std::span<const LChar>);
inline UniquedStringImpl(CreateSymbolTag, std::span<const UChar>);
inline UniquedStringImpl(CreateSymbolTag);
};
inline UniquedStringImpl::UniquedStringImpl(CreateSymbolTag, std::span<const LChar> characters)
: StringImpl(CreateSymbol, characters)
{ }
inline UniquedStringImpl::UniquedStringImpl(CreateSymbolTag, std::span<const UChar> characters)
: StringImpl(CreateSymbol, characters)
{ }
inline UniquedStringImpl::UniquedStringImpl(CreateSymbolTag)
: StringImpl(CreateSymbol)
{ }
#if ASSERT_ENABLED
// UniquedStringImpls created from StaticStringImpl will ASSERT
// in the generic ValueCheck<T>::checkConsistency
// as they are not allocated by fastMalloc.
// We don't currently have any way to detect that case
// so we ignore the consistency check for all UniquedStringImpls*.
template<> struct
ValueCheck<UniquedStringImpl*> {
static void checkConsistency(const UniquedStringImpl*) { }
};
template<> struct
ValueCheck<const UniquedStringImpl*> {
static void checkConsistency(const UniquedStringImpl*) { }
};
#endif // ASSERT_ENABLED
} // namespace WTF
using WTF::UniquedStringImpl;
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