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85 lines
1.8 KiB
C++
85 lines
1.8 KiB
C++
/*
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* PROGRAM: Template to define a local vary stack variable.
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* MODULE: VaryStr.h
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* DESCRIPTION: Both automatic and dynamic memory allocation is available.
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*
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* The contents of this file are subject to the Initial
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* Developer's Public License Version 1.0 (the "License");
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* you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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* http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
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*
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* Software distributed under the License is distributed AS IS,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied.
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* See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Original Code was created by Alex Peshkov
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* for the Firebird Open Source RDBMS project.
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*
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* Copyright (c) 2009 Alex Peshkov <peshkoff@mail.ru>
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* and all contributors signed below.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*/
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#ifndef CLASSES_VARYSTR_H
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#define CLASSES_VARYSTR_H
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#include "../common/classes/alloc.h"
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namespace Firebird {
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template <size_t x>
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class VaryStr : public vary
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{
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char vary_tail[x - 1];
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public:
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VaryStr()
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{
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vary_length = 0;
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vary_string[0] = 0;
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}
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};
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template <size_t x>
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class DynamicVaryStr : public VaryStr<x>
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{
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vary* buffer;
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void clear()
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{
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delete[] reinterpret_cast<char*>(buffer);
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}
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public:
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DynamicVaryStr() : buffer(NULL) { }
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// It does not preserve string data! Not hard to do, but not required today. AP, 2009.
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vary* getBuffer(size_t len)
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{
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if (len <= x)
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{
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return this;
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}
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clear();
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buffer = reinterpret_cast<vary*>(FB_NEW(*getDefaultMemoryPool()) char[len + sizeof(USHORT)]);
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buffer->vary_length = 0;
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buffer->vary_string[0] = 0;
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return buffer;
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}
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~DynamicVaryStr()
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{
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clear();
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}
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};
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}
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#endif // CLASSES_VARYSTR_H
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