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g++ -std=c++11 -g -Wall -c main.cpp
g++ -std=c++11 -g -Wall -c LinkedListTester.cpp
g++ -std=c++11 -g -Wall -c Executive.cpp
g++ -std=c++11 -g -Wall -c Node.cpp
g++ -std=c++11 -g -Wall -c LinkedList.cpp
g++ -std=c++11 -g -Wall main.o LinkedListTester.o Executive.o -o HelloWorld
Undefined symbols for architecture x86_64:
  "LinkedList::insert(int, int)", referenced from:
      LinkedListTester::test02() in LinkedListTester.o
      LinkedListTester::test03() in LinkedListTester.o
      LinkedListTester::test04() in LinkedListTester.o
      LinkedListTester::test05() in LinkedListTester.o
      LinkedListTester::test06() in LinkedListTester.o
      LinkedListTester::test07() in LinkedListTester.o
      LinkedListTester::test08() in LinkedListTester.o
      ...
  "LinkedList::remove(int)", referenced from:
      LinkedListTester::test05() in LinkedListTester.o
      LinkedListTester::test06() in LinkedListTester.o
      LinkedListTester::test07() in LinkedListTester.o
      Executive::interactive_mode() in Executive.o
  "LinkedList::replace(int, int)", referenced from:
      Executive::interactive_mode() in Executive.o
  "LinkedList::LinkedList()", referenced from:
      LinkedListTester::test01() in LinkedListTester.o
      LinkedListTester::test02() in LinkedListTester.o
      LinkedListTester::test03() in LinkedListTester.o
      LinkedListTester::test04() in LinkedListTester.o
      LinkedListTester::test05() in LinkedListTester.o
      LinkedListTester::test06() in LinkedListTester.o
      LinkedListTester::test07() in LinkedListTester.o
      ...
  "LinkedList::~LinkedList()", referenced from:
      Executive::~Executive() in main.o
      LinkedListTester::test01() in LinkedListTester.o
      LinkedListTester::test02() in LinkedListTester.o
      LinkedListTester::test03() in LinkedListTester.o
      LinkedListTester::test04() in LinkedListTester.o
      LinkedListTester::test05() in LinkedListTester.o
      LinkedListTester::test06() in LinkedListTester.o
      ...
  "LinkedList::isEmpty() const", referenced from:
      LinkedListTester::test01() in LinkedListTester.o
  "LinkedList::getEntry(int) const", referenced from:
      Executive::interactive_mode() in Executive.o
  "LinkedList::getLength() const", referenced from:
      LinkedListTester::test02() in LinkedListTester.o
      LinkedListTester::test03() in LinkedListTester.o
      LinkedListTester::test04() in LinkedListTester.o
      LinkedListTester::test05() in LinkedListTester.o
      LinkedListTester::test06() in LinkedListTester.o
      LinkedListTester::test07() in LinkedListTester.o
      LinkedListTester::test08() in LinkedListTester.o
      ...
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see 
invocation)
make: *** [HelloWorld] Error 1

我输入了make进行编译，但出现上述错误下面是我的LinkedList.cpp和LinkedList.h代码。另外，还提供了makefile以防万一。

LinkedList.cpp

#include "LinkedList.h"

LinkedList::LinkedList() {
    m_front = nullptr;
    m_length = 0;
}

LinkedList::LinkedList(const LinkedList &original) {
    m_length = original.getLength();
    if(m_length == 0) {
        m_front = nullptr;
    }
    Node* temp = m_front;
    Node* temp1 = m_front;
    for (int i = 2; i <= m_length; i++) {
        temp -> setEntry(original.getEntry(i));
        temp1 -> setNext(temp);
        temp1 = temp;
    }
}

LinkedList::~LinkedList() {
    clear();
}

LinkedList& LinkedList::operator=(const LinkedList &original) {
    this -> clear();
    m_length = original.getLength();
    m_front -> setEntry(original.getEntry(1));

    for (int i = 2; i <= m_length; i++) {
        this -> insert(i, original.getEntry(i));
    }
    return (*this);
}

bool LinkedList::isEmpty() const {
    return m_front == nullptr;
}

int LinkedList::getLength() const {
    return m_length;
}

void LinkedList::insert(int position, int entry) {
    if (position < 1 || position > getLength() + 1)
        throw runtime_error("Position out of range!");
    Node* current = m_front;
    Node* previous = m_front;
    for (int i = 1; i < position; i++) {
        previous = current;
        current = current -> getNext();
    }
    Node* n = new Node(entry);
    n -> setNext(current);
    if (position == 1) m_front = n;
    else previous -> setNext(n);
    m_length++;
}

void LinkedList::remove(int position) {
    if (position < 1 || position > getLength())
        throw runtime_error("Position out of range!");
    Node* current = m_front;
    Node* previous = m_front;
    for (int i = 1; i < position; i++) {
        previous = current;
        current = current -> getNext();
    }
    if (position == 1) {
        m_front = current -> getNext();
    } else previous -> setNext(current -> getNext());
    delete current;
    m_length--;
}

void LinkedList::clear() {
    if (!isEmpty()) {
        while(m_front != nullptr) {
            Node* temp = m_front;
            m_front = m_front -> getNext();
            delete(temp);
        }
        m_length = 0;
    }
}

int LinkedList::getEntry(int position) const {
    if (position < 1 || position > getLength())
        throw runtime_error("Position out of range!");
    Node* temp = m_front;
    for (int i = 1; i < position; i++) {
        temp = temp -> getNext();
    }
    return temp -> getEntry();
}

void LinkedList::replace(int position, int newEntry) {
    if(position < 1 || position > getLength())
        throw runtime_error("Position out of range!");
    Node* temp = m_front;
    for (int i = 1; i < position; i++) {
        temp = temp -> getNext();
   }
    temp -> setEntry(newEntry);
}

//LinkedList.h

#ifndef LINKED_LIST_H
#define LINKED_LIST_H

#include "Node.h" 
#include <iostream>
#include <stdexcept> //For runtime_error

using namespace std;

class LinkedList {
private:
    Node *m_front;
    int m_length;

public:
    /**
    * @pre True
    * @post set value of m_front to nullptr and m_length to 0
    **/
    LinkedList();

    /**
    * @pre A list
    * @post creates a list
    * @param original: pass in the desired list
    **/
    LinkedList(const LinkedList &original);

    /** Destructor
    * @pre True
    * @post deletes all nodes in the list
    **/
    ~LinkedList();

    /**
    * @pre A list
    * @post copies the list into another empty list
    * @param original: pass in the desired list to be copied by =
    **/
    LinkedList &operator=(const LinkedList &original);

    /**
    * @pre True
    * @post returns true if the list is empty otherwise false
    **/
    bool isEmpty() const;

    /**
    * @pre True
    * @post Returns the value of the list's length
    **/
    int getLength() const;

    /**
    * @pre The position is between 1 and the list's length + 1
    * @post Inserts a node in a desired position
    * @param position: 1 <= position <= length + 1
    * @param entry: An entry to insert in the list
    * @throw std::runtime_error if the position is invalid
    **/
    void insert(int position, int entry);

    /**
    * @pre The position is between 1 and the list's length
    * @post Removes a node in the position
    * @param position: 1 <= position <= length
    * @throw std::runtime_error if the position is invalid
    **/
    void remove(int position);

    /**
    * @pre True
    * @post delete all nodes in the list
    **/
    void clear();

    /**
    * @pre The position is between 1 and the list's length
    * @post The entry at the position is returned
    * @param position: 1 <= position <= length
    * @throw std::runtime_error if the position is invalid
    **/
    int getEntry(int position) const;

    /**
    * @pre The position is between 1 and the list's length
    * @post The entry at the given position is replaced with the new entry
    * @param position:  1 <= position <= length
    * @param newEntry: A new entry to put in the list
    * @throw std::runtime_error if the position is invalid.
    **/
    void replace(int position, int newEntry);
};

#endif

// makefile
HelloWorld: main.o LinkedListTester.o Executive.o Node.o LinkedList.o
    g++ -std=c++11 -g -Wall main.o LinkedListTester.o Executive.o -o 
HelloWorld

main.o: main.cpp LinkedListTester.h Executive.h
    g++ -std=c++11 -g -Wall -c main.cpp

LinkedListTester.o: LinkedListTester.h LinkedListTester.cpp
    g++ -std=c++11 -g -Wall -c LinkedListTester.cpp

Executive.o: Executive.h Executive.cpp
    g++ -std=c++11 -g -Wall -c Executive.cpp

LinkedList.o: LinkedList.h LinkedList.cpp
    g++ -std=c++11 -g -Wall -c LinkedList.cpp

Node.o: Node.h Node.cpp
    g++ -std=c++11 -g -Wall -c Node.cpp

clean: 
    rm *.o HelloWorld

我试图通过检查更新和所有内容来找出问题所在，但我无法找到关于架构x86_64错误的未定义符号。

架构x86_64的未定义符号编译错误

0 个答案: