Question

我试图在一些带有标题类的文件中包含一个简单的哈希表类。但每当我尝试编译时，我会得到几个这样的错误：

LNK2019：未解决的外部符号＆＃34; public：__ thishisall HashTable :: ~HashTable（void）＆＃34; （?? 1HashTable @@ QAE @ XZ）在函数_main＆＃34;

中引用

我正在使用Visual Studio 2010.我知道这意味着它无法在任何源文件中找到函数定义。但是我已经将它们定义在与它所调用的文件相同的目录中的文件中。除非你设置了一些链接器选项，否则Visual Studio可能不会查看当前目录？

以下是源代码：

//HashTable.h
#ifndef HASH_H
#define HASH_H

class HashTable {

public:
    HashTable();
    ~HashTable();
    void AddPair(char* address, int value);
    //Self explanatory
    int GetValue(char* address);
    //Also self-explanatory. If the value doesn't exist it throws "No such address"

};

#endif



//HashTable.cpp
class HashTable {
protected:
    int HighValue;
    char** AddressTable;
    int* Table;

public:
    HashTable(){
        HighValue = 0;
    }
    ~HashTable(){
        delete AddressTable;
        delete Table;
    }
    void AddPair(char* address, int value){
        AddressTable[HighValue] = address;
        Table[HighValue] = value;
        HighValue += 1;
    }
    int GetValue(char* address){
        for (int i = 0; i<HighValue; i++){
            if (AddressTable[HighValue] == address) {

                return Table[HighValue];
            }
        }
        //If the value doesn't exist throw an exception to the calling program
        throw 1;
    };

};

Answer 1

不，你没有。您创建了一个新的class。

定义方法的正确方法是：

//HashTable.cpp

#include "HashTable.h"
HashTable::HashTable(){
    HighValue = 0;
}
HashTable::~HashTable(){
    delete AddressTable;
    delete Table;
}
void HashTable::AddPair(char* address, int value){
    AddressTable[HighValue] = address;
    Table[HighValue] = value;
    HighValue += 1;
}
int HashTable::GetValue(char* address){
    for (int i = 0; i<HighValue; i++){
        if (AddressTable[HighValue] == address) {

            return Table[HighValue];
        }
    }
    //If the value doesn't exist throw an exception to the calling program
    throw 1;
};

Visual C ++链接器错误2019

1 个答案: