我有一個關於如何在跨結構的兩個不同成員進行匹配時使用std :: map對象對結構鍵進行部分匹配的問題。使用std :: map部分匹配密鑰
讓我們從一個簡單的場景開始。假設我想對一個鍵進行部分匹配,只涉及結構的一個成員。我有以下地圖和關鍵字:
std::map<SimpleIdentifier, Contents>
下面介紹SimpleIdentifier。
/**
* \class SimpleIdentifier
* \brief Used to identify and sort data in the map
*/
class SimpleIdentifier
{
public:
SimpleIdentifier():
idA(-1),
idB(-1),
partialMatch1(false) {}
SimpleIdentifier(const long long int& a, const long long int& b):
idA(a),
idB(b),
partialMatch1(false) {}
void setPartialMatch1() { partialMatch1 = true; }
bool operator==(const Identifier& rhs) const
{
return (idA == rhs.idA) && (idB == rhs.idB);
}
bool operator<(const Identifier& rhs) const
{
if (partialMatch1 || rhs.partialMatch1)
{
// Match A to A
if(rhs.partialMatch1)
{
if(idA < rhs.idA)
{
return true;
}
}
else if(partialMatch1)
{
if(idA < rhs.idA)
{
return true;
}
}
return false;
}
else
{
if(idA < rhs.idA)
{
return true;
}
else if (idA == rhs.idA)
{
if(idB < rhs.idB)
{
return true;
}
}
}
return false;
}
private:
long long int idA;
long long int idB;
bool partialMatch1;
};
這讓我排序上A,並且如果A爲相等,則上排序B.因此,如果我有以下數據
dataMap:
Key: [ 0, 0 ] Value: []
Key: [ 0, 1 ] Value: []
Key: [ 0, 2 ] Value: []
Key: [ 3, 1 ] Value: []
Key: [ 3, 2 ] Value: []
Key: [ 3, 3 ] Value: []
Key: [ 5, 3 ] Value: []
Key: [ 5, 7 ] Value: []
我可以找到對應於該鍵 - 值對[ 3,2]
Identifier perfectMatchID(3, 2);
std::map<SimpleIdentifier, Contents>::iterator it = dataMap.begin();
it = dataMap.find(perfectMatchID);
我們也可以找到對應於[3,*]
Identifier partialMatchID(3, 2);
partialMatchID.setPartialMatch1();
std::map<SimpleIdentifier, Contents>::iterator it = dataMap.begin();
it = dataMap.find(partialMatchID);
部分匹配
這很好,因爲我可以通過while循環中的每個迭代器來查找每個匹配的鍵值對並對它進行操作。
我現在想擴展它以匹配匹配鍵3的任何一個成員,因此包括[3,*]或[*,3]。 SimpleIdentifier已被擴展到一個新的被稱爲標識符的對象。
標識符讓我做部分匹配,使用查詢鍵尋找四個方案。它看起來對四種情況(而不是實際的代碼)
queryKey.idA == idA
queryKey.idB == idB
queryKey.idA == idB
queryKey.idB == idA
然而,在實踐中,我需要在同一時間做對每個場景只設置部分匹配的一個(1〜4)while循環。
setPartialMatch1(); // a-rhs.a
setPartialMatch2(); // b-rhs.b
setPartialMatch3(); // a-rhs.b
setPartialMatch4(); // b-rhs.a
我希望能夠加強它,以便在一個塊中我可以識別部分匹配的密鑰。
setPartialMatch(); // magic
我已經設計了下面的單元測試。所有使用匹配1至匹配4的部分匹配都可以正常工作。但是,做一個部分匹配,以便我不需要做每一個都不起作用。你會發現使用setPartialMatch()來運行這個單元測試將會失敗。
任何想法或建議如何使它的工作,或替代品會很好。
完整的單元測試是下面:
/**
* \file PartialMatchUnitTest.cpp
*
* \brief Unit testing for partial matching in std::map
*
* \author Otto Nahmee
*/
#define BOOST_TEST_DYN_LINK
#define BOOST_TEST_MODULE PartialMatchingUnitTest
#include <boost/test/unit_test.hpp>
#include <iostream>
#include <map>
/*****************************************************************************/
BOOST_AUTO_TEST_SUITE(TestSuite)
/**
* \class Identifier
* \brief Used to identify and sort data in the map
*/
class Identifier
{
public:
Identifier():
idA(-1),
idB(-1),
partialMatch(false),
partialMatch1(false),
partialMatch2(false),
partialMatch3(false),
partialMatch4(false) {}
Identifier(const long long int& a, const long long int& b):
idA(a),
idB(b),
partialMatch(false),
partialMatch1(false),
partialMatch2(false),
partialMatch3(false),
partialMatch4(false) {}
void setPartialMatch() { partialMatch = true; }
void setPartialMatch1() { partialMatch1 = true; }
void setPartialMatch2() { partialMatch2 = true; }
void setPartialMatch3() { partialMatch3 = true; }
void setPartialMatch4() { partialMatch4 = true; }
bool operator==(const Identifier& rhs) const
{
return (idA == rhs.idA) && (idB == rhs.idB);
}
bool operator<(const Identifier& rhs) const
{
if (partialMatch || rhs.partialMatch)
{
// In order to match, only 1 should be false, the other 3 may or may not be false
//
// Note: The issue here is that the check that validates for the rhs.partialMatch should be identical
// to the check that validates for partialMatch. Since this is const that may not be possible
if(rhs.partialMatch)
{
unsigned int check1 = (idA < rhs.idA) ? 1 : 0; // Match A to A
unsigned int check2 = (idB < rhs.idB) ? 1 : 0; // Match B to B
unsigned int check3 = (idA < rhs.idB) ? 1 : 0; // Match A to B
unsigned int check4 = (idB < rhs.idA) ? 1 : 0; // Match B to A
if((check1 + check2 + check3 + check4) > 0)
{
return true;
}
}
else if(partialMatch)
{
unsigned int check1 = (idA < rhs.idA) ? 1 : 0; // Match A to A
unsigned int check2 = (idB < rhs.idB) ? 1 : 0; // Match B to B
unsigned int check3 = (idB < rhs.idA) ? 1 : 0; // Match B to A
unsigned int check4 = (idA < rhs.idB) ? 1 : 0; // Match A to B
if((check1 + check2 + check3 + check4) > 0)
{
return true;
}
}
return false;
}
else if (partialMatch1 || rhs.partialMatch1)
{
// Match A to A
if(rhs.partialMatch1)
{
if(idA < rhs.idA)
{
return true;
}
}
else if(partialMatch1)
{
if(idA < rhs.idA)
{
return true;
}
}
return false;
}
else if (partialMatch2 || rhs.partialMatch2)
{
// Match B to B
if(rhs.partialMatch2)
{
if(idB < rhs.idB)
{
return true;
}
}
else if(partialMatch2)
{
if(idB < rhs.idB)
{
return true;
}
}
return false;
}
else if (partialMatch3 || rhs.partialMatch3)
{
// Match A to B
if(rhs.partialMatch3)
{
if(idA < rhs.idB)
{
return true;
}
}
else if(partialMatch3)
{
if(idB < rhs.idA)
{
return true;
}
}
return false;
}
else if (partialMatch4 || rhs.partialMatch4)
{
// Match B to A
if(rhs.partialMatch4)
{
if(idB < rhs.idA)
{
return true;
}
}
else if(partialMatch4)
{
if(idA < rhs.idB)
{
return true;
}
}
return false;
}
else
{
if(idA < rhs.idA)
{
return true;
}
else if (idA == rhs.idA)
{
if(idB < rhs.idB)
{
return true;
}
}
}
return false;
}
private:
long long int idA;
long long int idB;
bool partialMatch;
bool partialMatch1;
bool partialMatch2;
bool partialMatch3;
bool partialMatch4;
};
/**
* \class Contents
* \brief Contents to get merged in
*/
struct Contents
{
public:
Contents():
num1(0),
num2(0),
num3(0),
num4(0)
{}
Contents(const long long int& n1, const long long int& n2, const long long int& n3, const long long int& n4):
num1(n1),
num2(n2),
num3(n3),
num4(n4)
{}
long long int num1;
long long int num2;
long long int num3;
long long int num4;
};
typedef std::pair<Identifier, Contents> DataPair;
typedef std::map<Identifier, Contents> DataMap;
/**
* \brief Testing Partial matching
*/
BOOST_AUTO_TEST_CASE(PartialMatch)
{
DataMap dataMap;
Identifier ID0(8, 9);
dataMap[ID0] = Contents(1,2,3,4);
Identifier ID1(10, 11);
dataMap[ID1] = Contents(1,2,3,4);
Identifier ID2(12, 14);
dataMap[ID2] = Contents(1,2,3,4);
Identifier ID3(15, 17);
dataMap[ID3] = Contents(1,2,3,4);
Identifier ID4(14, 22);
dataMap[ID4] = Contents(1,2,3,4);
Identifier ID5(23, 25);
dataMap[ID5] = Contents(1,2,3,4);
// Test perfect matching
{
Identifier perfectMatchID1(10, 11);
DataMap::iterator it1 = dataMap.begin();
it1 = dataMap.find(perfectMatchID1);
BOOST_CHECK(it1 != dataMap.end());
BOOST_CHECK(it1->first == ID1);
Identifier perfectMatchID3(15, 17);
DataMap::iterator it3 = dataMap.begin();
it3 = dataMap.find(perfectMatchID3);
BOOST_CHECK(it3 != dataMap.end());
BOOST_CHECK(it3->first == ID3);
}
// Test partial matching
// Try to match ID1 (10, 11);
{
Identifier partialMatchID1(10, 100);
Identifier partialMatchID2(110, 11);
Identifier partialMatchID3(110, 10);
Identifier partialMatchID4(11, 100);
Identifier partialMatchID5(10, 0);
Identifier partialMatchID6(0, 11);
Identifier partialMatchID7(0, 10);
Identifier partialMatchID8(11, 0);
Identifier partialMatchID9(10, 11);
partialMatchID1.setPartialMatch1(); // a-rhs.a
partialMatchID2.setPartialMatch2(); // b-rhs.b
partialMatchID3.setPartialMatch3(); // a-rhs.b
partialMatchID4.setPartialMatch4(); // b-rhs.a
partialMatchID5.setPartialMatch1(); // a-rhs.a
partialMatchID6.setPartialMatch2(); // b-rhs.b
partialMatchID7.setPartialMatch3(); // a-rhs.b
partialMatchID8.setPartialMatch4(); // b-rhs.a
partialMatchID9.setPartialMatch1();
DataMap::iterator it1 = dataMap.begin();
it1 = dataMap.find(partialMatchID1);
BOOST_CHECK(it1 != dataMap.end());
BOOST_CHECK(it1->first == ID1);
DataMap::iterator it2 = dataMap.begin();
it2 = dataMap.find(partialMatchID2);
BOOST_CHECK(it2 != dataMap.end());
BOOST_CHECK(it2->first == ID1);
DataMap::iterator it3 = dataMap.begin();
it3 = dataMap.find(partialMatchID3);
BOOST_CHECK(it3 != dataMap.end());
BOOST_CHECK(it3->first == ID1);
DataMap::iterator it4 = dataMap.begin();
it4 = dataMap.find(partialMatchID4);
BOOST_CHECK(it4 != dataMap.end());
BOOST_CHECK(it4->first == ID1);
DataMap::iterator it5 = dataMap.begin();
it5 = dataMap.find(partialMatchID5);
BOOST_CHECK(it5 != dataMap.end());
BOOST_CHECK(it5->first == ID1);
DataMap::iterator it6 = dataMap.begin();
it6 = dataMap.find(partialMatchID6);
BOOST_CHECK(it6 != dataMap.end());
BOOST_CHECK(it6->first == ID1);
DataMap::iterator it7 = dataMap.begin();
it7 = dataMap.find(partialMatchID7);
BOOST_CHECK(it7 != dataMap.end());
BOOST_CHECK(it7->first == ID1);
DataMap::iterator it8 = dataMap.begin();
it8 = dataMap.find(partialMatchID8);
BOOST_CHECK(it8 != dataMap.end());
BOOST_CHECK(it8->first == ID1);
DataMap::iterator it9 = dataMap.begin();
it9 = dataMap.find(partialMatchID9);
BOOST_CHECK(it9 != dataMap.end());
BOOST_CHECK(it9->first == ID1);
}
// Try to match ID1 (10, 11);
{
Identifier partialMatchID1(10, 100);
Identifier partialMatchID2(110, 11);
Identifier partialMatchID3(11, 100);
Identifier partialMatchID4(110, 10);
Identifier partialMatchID5(10, 0);
Identifier partialMatchID6(0, 11);
Identifier partialMatchID7(11, 0);
Identifier partialMatchID8(0, 10);
Identifier partialMatchID9(10, 11);
partialMatchID1.setPartialMatch();
partialMatchID2.setPartialMatch();
partialMatchID3.setPartialMatch();
partialMatchID4.setPartialMatch();
partialMatchID5.setPartialMatch();
partialMatchID6.setPartialMatch();
partialMatchID7.setPartialMatch();
partialMatchID8.setPartialMatch();
partialMatchID9.setPartialMatch();
DataMap::iterator it1 = dataMap.begin();
it1 = dataMap.find(partialMatchID1);
BOOST_CHECK(it1 != dataMap.end());
BOOST_CHECK(it1->first == ID1);
DataMap::iterator it2 = dataMap.begin();
it2 = dataMap.find(partialMatchID2);
BOOST_CHECK(it2 != dataMap.end());
BOOST_CHECK(it2->first == ID1);
DataMap::iterator it3 = dataMap.begin();
it3 = dataMap.find(partialMatchID3);
BOOST_CHECK(it3 != dataMap.end());
BOOST_CHECK(it3->first == ID1);
DataMap::iterator it4 = dataMap.begin();
it4 = dataMap.find(partialMatchID4);
BOOST_CHECK(it4 != dataMap.end());
BOOST_CHECK(it4->first == ID1);
DataMap::iterator it5 = dataMap.begin();
it5 = dataMap.find(partialMatchID5);
BOOST_CHECK(it5 != dataMap.end());
BOOST_CHECK(it5->first == ID1);
DataMap::iterator it6 = dataMap.begin();
it6 = dataMap.find(partialMatchID6);
BOOST_CHECK(it6 != dataMap.end());
BOOST_CHECK(it6->first == ID1);
DataMap::iterator it7 = dataMap.begin();
it7 = dataMap.find(partialMatchID7);
BOOST_CHECK(it7 != dataMap.end());
BOOST_CHECK(it7->first == ID1);
DataMap::iterator it8 = dataMap.begin();
it8 = dataMap.find(partialMatchID8);
BOOST_CHECK(it8 != dataMap.end());
BOOST_CHECK(it8->first == ID1);
DataMap::iterator it9 = dataMap.begin();
it9 = dataMap.find(partialMatchID9);
BOOST_CHECK(it9 != dataMap.end());
BOOST_CHECK(it9->first == ID1);
}
// Try to match ID3 (15, 17);
{
Identifier partialMatchID1(15, 100);
Identifier partialMatchID2(110, 17);
Identifier partialMatchID3(17, 100);
Identifier partialMatchID4(110, 15);
Identifier partialMatchID5(15, 0);
Identifier partialMatchID6(0, 17);
Identifier partialMatchID7(17, 0);
Identifier partialMatchID8(0, 15);
Identifier partialMatchID9(15, 17);
partialMatchID1.setPartialMatch();
partialMatchID2.setPartialMatch();
partialMatchID3.setPartialMatch();
partialMatchID4.setPartialMatch();
partialMatchID5.setPartialMatch();
partialMatchID6.setPartialMatch();
partialMatchID7.setPartialMatch();
partialMatchID8.setPartialMatch();
partialMatchID9.setPartialMatch();
DataMap::iterator it1 = dataMap.begin();
it1 = dataMap.find(partialMatchID1);
BOOST_CHECK(it1 != dataMap.end());
BOOST_CHECK(it1->first == ID3);
DataMap::iterator it2 = dataMap.begin();
it2 = dataMap.find(partialMatchID2);
BOOST_CHECK(it2 != dataMap.end());
BOOST_CHECK(it2->first == ID3);
DataMap::iterator it3 = dataMap.begin();
it3 = dataMap.find(partialMatchID3);
BOOST_CHECK(it3 != dataMap.end());
BOOST_CHECK(it3->first == ID3);
DataMap::iterator it4 = dataMap.begin();
it4 = dataMap.find(partialMatchID4);
BOOST_CHECK(it4 != dataMap.end());
BOOST_CHECK(it4->first == ID3);
DataMap::iterator it5 = dataMap.begin();
it5 = dataMap.find(partialMatchID5);
BOOST_CHECK(it5 != dataMap.end());
BOOST_CHECK(it5->first == ID3);
DataMap::iterator it6 = dataMap.begin();
it6 = dataMap.find(partialMatchID6);
BOOST_CHECK(it6 != dataMap.end());
BOOST_CHECK(it6->first == ID3);
DataMap::iterator it7 = dataMap.begin();
it7 = dataMap.find(partialMatchID7);
BOOST_CHECK(it7 != dataMap.end());
BOOST_CHECK(it7->first == ID3);
DataMap::iterator it8 = dataMap.begin();
it8 = dataMap.find(partialMatchID8);
BOOST_CHECK(it8 != dataMap.end());
BOOST_CHECK(it8->first == ID3);
DataMap::iterator it9 = dataMap.begin();
it9 = dataMap.find(partialMatchID9);
BOOST_CHECK(it9 != dataMap.end());
BOOST_CHECK(it9->first == ID3);
}
}
BOOST_AUTO_TEST_SUITE_END()
/*****************************************************************************/
「map.find將只返回一個唯一匹配。如果您正在'迭代'它必須超出map.find」 - 它只返回一個唯一匹配。如果我把std :: find放在while循環中,那麼我可以找到所有匹配的鍵值對,直到不再匹配。 –