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Find.h
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203 lines (188 loc) · 3.9 KB
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// Author : XuBenHao
// Version : 1.0.0
// Mail : xbh370970843@163.com
// Copyright : XuBenHao 2020 - 2030 *
#ifndef ALLIB_ALGORITHM_SEARCH_FIND_H
#define ALLIB_ALGORITHM_SEARCH_FIND_H
#include "..\..\stdafx.h"
namespace AlLib
{
namespace Algorithm
{
namespace Search
{
class Helper
{
public:
enum FINDTYPE
{
SEQUENCE = 0,
BINARY,
};
enum SORTTYPE
{
DESCENDING = 0,
ASCENDING,
};
// 返回值:
// 成功:
// 指向查找值指针
// 失败:
// null
template <typename T,
FINDTYPE FindType = FINDTYPE::SEQUENCE,
SORTTYPE SortType = SORTTYPE::ASCENDING>
static T* Find(
T* pStart_, // 指向首元素
T* pEnd_, // 指向尾后元素
const T &value_);// 搜索值
// 返回值:
// 成功:
// 查找元素索引
// 失败:
// -1
template <typename T,
FINDTYPE FindAlgorithmType = FINDTYPE::SEQUENCE,
SORTTYPE FindSortType = SORTTYPE::ASCENDING>
static int Find(
T* pStart_,
int nStartIndex_, // 查找起始元素索引
int nEndIndex_, // 查找尾部元素索引
const T& value_);// 查找值
private:
template <typename T>
static T* SequenceFind(
T* pStart_,
T* pEnd_,
const T &value_);
template <typename T,
SORTTYPE FindSortType>
static T* BinaryFind(
T* pStart_,
T* pEnd_,
const T &value_);
};
// 返回值:
// 成功:
// 指向查找值指针
// 失败:
// null
template <typename T,
Helper::FINDTYPE FindAlgorithmType,
Helper::SORTTYPE FindSortType>
T* Helper::Find(
T* pStart_, // 指向首元素
T* pEnd_, // 指向尾后元素
const T &value_)// 搜索值
{
if (FindAlgorithmType == FINDTYPE::SEQUENCE)
{
return SequenceFind(pStart_, pEnd_, value_);
}
else if (FindAlgorithmType == FINDTYPE::BINARY)
{
return BinaryFind<T, FindSortType>(pStart_, pEnd_, value_);
}
else
{
return nullptr;
}
}
template <typename T>
T* Helper::SequenceFind(
T* pStart_,
T* pEnd_,
const T &value_)
{
T* _pTemp = pStart_;
while (_pTemp != pEnd_)
{
if (*_pTemp == value_)
{
return _pTemp;
}
_pTemp++;
}
return nullptr;
}
template <typename T,
Helper::SORTTYPE FindSortType>
T* Helper::BinaryFind(
T* pStart_,
T* pEnd_,
const T &value_)
{
int _nNum = (pEnd_ - pStart_);
if (_nNum < 1)
{
return nullptr;
}
if (_nNum == 1)
{
if (*pStart_ == value_)
{
return pStart_;
}
else
{
return nullptr;
}
}
T* _pMid = pStart_ + _nNum / 2;
if (*_pMid == value_)
{
return _pMid;
}
else if (*_pMid < value_)
{
if (FindSortType == SORTTYPE::ASCENDING)
{
return BinaryFind<T, FindSortType>(_pMid + 1, pEnd_, value_);
}
else
{
return BinaryFind<T, FindSortType>(pStart_, _pMid, value_);
}
}
else
{
if (FindSortType == SORTTYPE::ASCENDING)
{
return BinaryFind<T, FindSortType>(pStart_, _pMid, value_);
}
else
{
return BinaryFind<T, FindSortType>(_pMid + 1, pEnd_, value_);
}
}
}
// 成功:
// 查找元素索引
// 失败:
// -1
template <typename T,
Helper::FINDTYPE FindAlgorithmType,
Helper::SORTTYPE FindSortType>
int Helper::Find(
T* pStart_,
int nStartIndex_, // 查找起始元素索引
int nEndIndex_, // 查找尾部元素索引
const T& value_)// 查找值
{
T* _pActualStart = pStart_ + nStartIndex_;
T* _pActualEnd = pStart_ + nEndIndex_ + 1;
T* _pRet = Find<T, FindAlgorithmType, FindSortType>(_pActualStart, _pActualEnd);
if (_pRet == nullptr)
{
return -1;
}
else
{
value_ = *_pRet;
return _pRet - pStart_;
}
}
}
}
}
#endif