Array.hpp
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- /* Copyright (C) 2003 MySQL AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program 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 General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- #ifndef ARRAY_HPP
- #define ARRAY_HPP
- #include "ArrayPool.hpp"
- #include <pc.hpp>
- #include <ErrorReporter.hpp>
- /**
- * Template class used for implementing an
- * array of object retreived from a pool
- */
- template <class T>
- class Array {
- public:
- Array(ArrayPool<T> & thePool);
- /**
- * Allocate an <b>n</b> objects from pool
- * These can now be addressed with 0 <= ptr.i < n
- */
- bool seize(Uint32 i);
- /**
- * Release all object from array
- */
- void release();
- /**
- * Return current size of array
- */
- Uint32 getSize() const;
- /**
- * empty
- */
- inline bool empty() const { return sz == 0;}
- /**
- * Update i & p value according to <b>i</b>
- */
- void getPtr(Ptr<T> &, Uint32 i) const;
- /**
- * Update p value for ptr according to i value
- */
- void getPtr(Ptr<T> &) const ;
-
- /**
- * Get pointer for i value
- */
- T * getPtr(Uint32 i) const;
-
- private:
- Uint32 base, sz;
- ArrayPool<T> & thePool;
- };
- template<class T>
- inline
- Array<T>::Array(ArrayPool<T> & _pool)
- : thePool(_pool)
- {
- sz = 0;
- base = RNIL;
- }
- template<class T>
- inline
- bool
- Array<T>::seize(Uint32 n){
- if(base == RNIL && n > 0){
- base = thePool.seizeN(n);
- if(base != RNIL){
- sz = n;
- return true;
- }
- return false;
- }
- ErrorReporter::handleAssert("Array<T>::seize failed", __FILE__, __LINE__);
- return false;
- }
- template<class T>
- inline
- void
- Array<T>::release(){
- if(base != RNIL){
- thePool.releaseN(base, sz);
- sz = 0;
- base = RNIL;
- return;
- }
- }
- template<class T>
- inline
- Uint32
- Array<T>::getSize() const {
- return sz;
- }
- template <class T>
- inline
- void
- Array<T>::getPtr(Ptr<T> & p, Uint32 i) const {
- p.i = i;
- #ifdef ARRAY_GUARD
- if(i < sz && base != RNIL){
- p.p = thePool.getPtr(i + base);
- return;
- } else {
- ErrorReporter::handleAssert("Array::getPtr failed", __FILE__, __LINE__);
- }
- #endif
- p.p = thePool.getPtr(i + base);
- }
- template<class T>
- inline
- void
- Array<T>::getPtr(Ptr<T> & ptr) const {
- #ifdef ARRAY_GUARD
- if(ptr.i < sz && base != RNIL){
- ptr.p = thePool.getPtr(ptr.i + base);
- return;
- } else {
- ErrorReporter::handleAssert("Array<T>::getPtr failed", __FILE__, __LINE__);
- }
- #endif
- ptr.p = thePool.getPtr(ptr.i + base);
- }
- template<class T>
- inline
- T *
- Array<T>::getPtr(Uint32 i) const {
- #ifdef ARRAY_GUARD
- if(i < sz && base != RNIL){
- return thePool.getPtr(i + base);
- } else {
- ErrorReporter::handleAssert("Array<T>::getPtr failed", __FILE__, __LINE__);
- }
- #endif
- return thePool.getPtr(i + base);
- }
- #endif