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110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
/*
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* PROGRAM: Common class definition
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* MODULE: fb_pair.h
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* DESCRIPTION: Provides almost that same functionality,
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* that STL::pair does, but behaves
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* MemoryPools friendly.
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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 Alexander Peshkoff
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* for the Firebird Open Source RDBMS project.
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*
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* Copyright (c) 2004 Alexander Peshkoff <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 FB_PAIR_H
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#define FB_PAIR_H
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#include "../common/classes/alloc.h"
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namespace Firebird
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{
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// Left pair - left object in such pair has MemoryPool'ed constructor,
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// right one - doesn't (typically POD or builtin type)
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template<class parLeft, class parRight>
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struct LeftPair {
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typedef parLeft first_type;
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typedef parRight second_type;
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LeftPair(MemoryPool *p) : first(p), second() {}
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LeftPair(MemoryPool *p, const parLeft& v1, const parRight& v2)
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: first(p, v1), second(v2) {}
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LeftPair(MemoryPool *p, const LeftPair& lp)
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: first(p, lp.first), second(lp.second) {}
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parLeft first;
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parRight second;
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};
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template<class parLeft, class parRight>
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inline bool operator==(const LeftPair<parLeft, parRight>& v1,
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const LeftPair<parLeft, parRight>& v2)
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{
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return (v1.first == v2.first && v1.second == v2.second);
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}
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template<class parLeft, class parRight>
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inline bool operator!=(const LeftPair<parLeft, parRight>& v1,
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const LeftPair<parLeft, parRight>& v2)
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{
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return (!(v1 == v2));
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}
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template<class parLeft, class parRight>
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inline bool operator<(const LeftPair<parLeft, parRight>& v1,
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const LeftPair<parLeft, parRight>& v2)
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{
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return (v1.first < v2.first ||
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!(v2.first < v1.first) && v1.second < v2.second);
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}
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template<class parLeft, class parRight>
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inline bool operator>(const LeftPair<parLeft, parRight>& v1,
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const LeftPair<parLeft, parRight>& v2)
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{
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return (v2 < v1);
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}
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template<class parLeft, class parRight>
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inline bool operator<=(const LeftPair<parLeft, parRight>& v1,
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const LeftPair<parLeft, parRight>& v2)
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{
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return (!(v2 < v1));
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}
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template<class parLeft, class parRight>
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inline bool operator>=(const LeftPair<parLeft, parRight>& v1,
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const LeftPair<parLeft, parRight>& v2)
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{
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return (!(v1 < v2));
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}
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template <typename Pair>
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class FirstKey
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{
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public:
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typedef typename Pair::first_type Pair_first_type;
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static const Pair_first_type&
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generate(void* sender, const Pair& Item)
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{
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return Item.first;
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}
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};
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};
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#endif // FB_PAIR_H
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