81 lines
1.2 KiB
C++
81 lines
1.2 KiB
C++
/*
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* Copyright 2011, Ingo Weinhold, ingo_weinhold@gmx.de.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _SUPPORT_BSTRING_PRIVATE_H_
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#define _SUPPORT_BSTRING_PRIVATE_H_
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#include <stdlib.h>
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#include <String.h>
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class BString::Private {
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public:
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static const uint32 kPrivateDataOffset = 2 * sizeof(int32);
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public:
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Private(const BString& string)
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:
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fString(string)
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{
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}
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char* Data()
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{
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return fString.fPrivateData;
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}
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bool IsShareable() const
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{
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return fString._IsShareable();
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}
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static int32& DataRefCount(char* data)
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{
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return *(((int32 *)data) - 2);
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}
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int32& DataRefCount()
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{
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return DataRefCount(Data());
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}
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static int32& DataLength(char* data)
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{
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return *(((int32*)data) - 1);
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}
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int32& DataLength()
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{
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return DataLength(Data());
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}
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static void IncrementDataRefCount(char* data)
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{
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if (data != NULL)
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atomic_add(&DataRefCount(data), 1);
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}
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static void DecrementDataRefCount(char* data)
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{
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if (data != NULL) {
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if (atomic_add(&DataRefCount(data), -1) == 1)
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free(data - kPrivateDataOffset);
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}
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}
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static BString StringFromData(char* data)
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{
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return BString(data, BString::PRIVATE_DATA);
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}
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private:
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const BString& fString;
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};
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#endif // _SUPPORT_BSTRING_PRIVATE_H_
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